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A study of the properties of hydrophobically associating water-soluble polymers used in drilling fluids
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作者 舒福昌 史茂勇 +4 位作者 张岩 张峰 黄红玺 向兴金 王建华 《Petroleum Science》 SCIE CAS CSCD 2004年第4期57-61,共5页
Hydrophobically associating water-soluble polymers (HPAP) have been synthesized from acrylamide(AM), acrylate (AA), 2-acrylamido-2-methyl propane sulfonic acid (AMPS) and hydrophobic monomer (AP) in aqueous solution... Hydrophobically associating water-soluble polymers (HPAP) have been synthesized from acrylamide(AM), acrylate (AA), 2-acrylamido-2-methyl propane sulfonic acid (AMPS) and hydrophobic monomer (AP) in aqueous solution by radical polymerization. New polymer drilling fluids are made up of HPAP, which is used as viscosifiers and encapsulation agents. Properties of this system are reported in this paper. Results indicate that this system has a high value of yield point to plastic viscosity (YP/PV≥0.7), high viscosity at a low-shear rate (LSRV≥30000mPa·s), excellent shear thinning behavior, good solid-carrying behavior, resistance to shear, good thermal stability (as high as 140℃) and salt resistance. The system has excellent behavior in high-density solution of NaCl and in calcium and magnesium rich saline solutions. Hence, HPAP also can be used in saltwater polymer drilling fluids. 展开更多
关键词 Hydrophobically associating water-soluble polymers drilling fluids VISCOSITY salt resistance
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Preparation of Ultrafine Water-soluble Polymers Nanofiber Mats via Electrospinning 被引量:3
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作者 SUN Guo-en TENG Hong +2 位作者 ZHANG Chun-ling DOU Yan-li LI Yi 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2010年第2期318-322,共5页
A series of water-soluble polymers such as poly(ethylene oxide)(PEO), polyacrylamide(PAM) and poly(vinyl pyrrilidone)(PVP) was successfully prepared via the electrospinning of their aqueous solutions without... A series of water-soluble polymers such as poly(ethylene oxide)(PEO), polyacrylamide(PAM) and poly(vinyl pyrrilidone)(PVP) was successfully prepared via the electrospinning of their aqueous solutions without the use of a surfactant. The effects of solution properties on the electrospinning of PEO, PAM and PVP solutions were investigated. The viscosity of the solution, charge density carried by the jet, and the surface tension of the solution are the key factors that influence the morphology and diameter size of the fibers. The viscosity of the solution was measured on a modular compact rheometer. The morphology and the diameter size distribution of the fibers were observed under an environmental scanning electron microscope(ESEM). The results show that the diameters of the nanofibers electro spun from the solutions of these water soluble polymers were uniform and less than 300 nm. 展开更多
关键词 FIBER ELECTROSPINNING Water-soluble polymer
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Application of Water-Soluble Polymer in Dewatering of Fine Coal
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作者 王兴涌 《International Journal of Mining Science and Technology》 SCIE EI 1998年第2期179-181,共3页
The addition of water-soluble polymer to a fine coal slurry to enhance dewatering process is considered to be one of the most effective ways of solving the problems of dewatering of fine coal. A series of tests are co... The addition of water-soluble polymer to a fine coal slurry to enhance dewatering process is considered to be one of the most effective ways of solving the problems of dewatering of fine coal. A series of tests are conducted with a vacuum dewatering apparatus to study the effects of various factors such as the species of polymer, polymer dosage and its ways of addition, and the pH of fine coal slurry on filtrating and dewatering of fine coal. 展开更多
关键词 DEWATERING FINE COAL WATER-SOLUBLE polymer
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SCIENTIFIC PRINCIPLES FOR MODIFICATION OF WATER-SOLUBLE POLYMERS. FORMATION OF MACROMOLECULAR COMPLEXES
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作者 PAUTOV V.D. ANUFRIEVA E.V. KRAKOVYAK M.G. 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1998年第3期268-278,共11页
The study of nanosecond dynamics of macromolecules with the lumines-cent methods make it possible to investigate the formation and functioning of polymericcomplexes, polymeric conjugates and macromolecular metal compl... The study of nanosecond dynamics of macromolecules with the lumines-cent methods make it possible to investigate the formation and functioning of polymericcomplexes, polymeric conjugates and macromolecular metal complexes, which are widelyused for solving many practical tasks. The nanosecond dynamics of macromolecules are ahighly sensitive indicator of interpolymer complexes (IPC) formation. It enables us to solvethe problems of studying IPC formation and stability and to investigate the interpolymerreactions of exchange and substitution. The investigation of changes in the rotational mo-bility of globular protein molecules as a whole makes it possible to determine the complexcomposition and its stability, and to control the course of polymer-protein conjugate forma-tion reaction. The nanosecond dynamics of polymers interacting with surfacants' ions (S)are the sensitive indicator of the S-polymer complex formation. A method for determin-ing the equilibrium constants of the S-polymer complex formation was developed on thebasis of the study of polymer chains mobility. It is established that nanosecond dynamicsinfluences the course of chemical reactions in polymer chains. Moreover, the marked effectof the nanosecond dynamics is also revealed in the study of photophysical processes (theformation of excimers and energy migration of electron excitation) in polymers with pho-toactive groups. It was found that the efficiency of both processes increases with increasingthe mobility of side chains, the carriers of photoactive groups. 展开更多
关键词 Modification of water-soluble polymers Formation of complexes
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XPS Study on Water-Soluble Polymer Surfactant Film
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作者 Jian XU Liang He SHI Mei Ling YE (Polymer Physics Laboratory, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第11期0-0,共2页
By means of changing the detection angle, the molecular conformation of a new type of polymer surfactant, acrylamide-poly(oxyethykene alkyl ether)acrylate-anionic monomer random copolymer, was studied by x-ray photoel... By means of changing the detection angle, the molecular conformation of a new type of polymer surfactant, acrylamide-poly(oxyethykene alkyl ether)acrylate-anionic monomer random copolymer, was studied by x-ray photoelectron spectroscopy(XPS) in detail. 展开更多
关键词 XPS Study on Water-Soluble polymer Surfactant Film
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Polymer-based nanoparticulate solid dispersions prepared by a modified electrospraying process 被引量:2
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作者 Deng-Guang Yu Gareth R. Williams +4 位作者 Xia Wang Jun-He Yang Xiao-Yan Li Wei Qian Ying Li 《Journal of Biomedical Science and Engineering》 2011年第12期741-749,共9页
A modified electrospraying process is exploited to enhance the dissolution profiles of a poorly water-soluble drug. With polyvinylpyrrolidone (PVP) as a hydrophilic polymer matrix and ketoprofen (KET) as a model drug,... A modified electrospraying process is exploited to enhance the dissolution profiles of a poorly water-soluble drug. With polyvinylpyrrolidone (PVP) as a hydrophilic polymer matrix and ketoprofen (KET) as a model drug, polymer-drug composites in the form of nanoparticles were prepared and characterized. The surface morphologies, the physical status of the drug, and the drug-polymer interactions were studied using FESEM, DSC, XRD, and ATR-FTIR. FESEM observations demonstrated that the nanoparticles gradually decreased in size from 640 ± 350, to 530 ± 320, 460 ± 200 and 320 ± 160 nm as the KET content increased from 0, to 9.1%, 16.7% and 33.3% w/w, respectively. Results from DSC and XRD suggested that KET was distributed in the PVP matrix in an amorphous manner at the molecular level. This is thought to be due to their compatibility, arising through hydrogen bonding as demonstrated by ATR- FTIR spectra. In vitro dissolution tests showed that the nanoparticles released the incorporated KET within 1 min, evidencing markedly improved dissolution over pure KET and a KET-PVP physical mixture. Electrospraying can hence offer a facile route to develop new polymer composites for biomedical applications, in particular for improving dissolution rate of poorly water-soluble drugs. 展开更多
关键词 polymer Composites ELECTROSPRAYING Poorly WATER-SOLUBLE DRUG Nanoparticles Solid DISPERSION POLYVINYLPYRROLIDONE
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STUDY ON HIGH PERFORMANCE ANTI—WEAR ADDITIVES FROM WATER—SOLUBLE POLYMERIC LUBRICANT
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作者 官文超 Tsutom Kagiya 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1995年第4期338-346,共9页
A series of high performance lubricants of water-soluble polymers with telechelic or star structures has been studied. Their average molecular weights (M) over bar are 1800-6000. The chemical structures of the lubrica... A series of high performance lubricants of water-soluble polymers with telechelic or star structures has been studied. Their average molecular weights (M) over bar are 1800-6000. The chemical structures of the lubricants are characterized by their hydrophilic groups (-CH2CH2O-), -COOH, -OH, -CONH2 and antiwear active elements (S,P,Zn and Mo). The results of assessing for the anti-wear property indicate that this kind of water-soluble polymeric lubricants possesses excellent watersolubility, lubricity and anti-wear property. A preliminary study on the anti-wear mechanism of the polymers is performed by means of electron probe and scanning electron microscopy (SEM). 展开更多
关键词 ANTIWEAR LUBRICANT friction water-soluble polymer star structure
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STUDIES ON THE POLYMERIZATION OF β-CYCLODEXTRIN WITH EPICHLOROHYDRIN
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作者 徐文英 汪月生 +3 位作者 沈三荣 李一山 夏树良 张意颖 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1989年第1期16-22,共7页
Different proportions of β-cydodextrin and epichlorohydrin were used to prepare a group of β-cyclodextrin polymers. The relationship between the reaction extent and the molar ratios of reactants was discussed accord... Different proportions of β-cydodextrin and epichlorohydrin were used to prepare a group of β-cyclodextrin polymers. The relationship between the reaction extent and the molar ratios of reactants was discussed according to the results of ~1H-NMR, ^(13) C-NMR spectra and elemental analysis. Especially, high resolution ~1H-NMR spectra were usd for studying the reaction active sites and the extent of reaction. The solubility of oil soluble drugs in water was largely improved in the presence of water-soluble β-cyclodextrin polymer. 展开更多
关键词 Β-CYCLODEXTRIN EPICHLOROHYDRIN Water-soluble polymers β-CD
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Micellar Copolymerization: the State of the Arts
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作者 FENG Yu-jun 《合成化学》 CAS CSCD 2004年第z1期94-94,共1页
关键词 MICELLAR copolymerization hydrophobically associating WATER-SOLUBLE polymers acrylamide.
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Polymer Coatings for Protection of Wood and Wood-Based Materials
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作者 Tamara V. Sakhno Nikolay N. Barashkov +2 位作者 Irina S. Irgibaeva S. V. Pustovit Yuriy E. Sakhno 《Advances in Chemical Engineering and Science》 2016年第2期93-110,共18页
Three major types of protective coating of wood and wood-based materials have been considered. These three types include the coatings based on carboxyl-containing water-soluble polymers which are easily cross-linked b... Three major types of protective coating of wood and wood-based materials have been considered. These three types include the coatings based on carboxyl-containing water-soluble polymers which are easily cross-linked by inorganic salts or OH-containing compounds, pH-sensitive coatings and polymer multi-layer structures. First of three mentioned approaches allows affecting permeability and enhancing the prevention the loss of water from the surface of wood to its surrounding. The advantage of the second approach is its ability to vary and purposely adjust the polymer composition and the number and distribution of -COOH groups in the chain which make the originally water-soluble polymers completely insoluble. The strong feature of the third approach which includes broad use of hydrogen-bonded films produced by layer-by-layer self-assembly is the possibility of manipulation of coatings stability after construction. 展开更多
关键词 Protective Coatings polymer Films PH-SENSITIVITY Water-Soluble polymers Hydrogen Bonds SELF-ASSEMBLY
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ASSOCIATION BEHAVIOR OF PORPHYRIN PENDANTS IN pH-SENSITIVE WATER-SOLUBLE POLYMER 被引量:2
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作者 Ke—wei Ding Fei Wang Fei-peng Wu 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2012年第1期63-71,共9页
A novel tripyridylporphyrin monomer,5-[4-[2-(acryloyloxy)ethoxy]phenyl]-10,15,20-tris(4-pyridyl)porphyrin (TrPyP),was synthesized and polymerized with acrylamide(AM) to prepare the hydrophobically associating ... A novel tripyridylporphyrin monomer,5-[4-[2-(acryloyloxy)ethoxy]phenyl]-10,15,20-tris(4-pyridyl)porphyrin (TrPyP),was synthesized and polymerized with acrylamide(AM) to prepare the hydrophobically associating water-soluble polymer PAM-TrPyP.The aggregation behavior of porphyrin pendants was investigated by UV-Visible and fluorescence spectra.The polymer displays a strong tendency of hydrophobic association even in dilute solutions.With increasing the concentration,the maximum absorption wavelength of Soret band changes from 416 nm to 407 nm,and the fluorescence corrected for the inner filter effect exhibits moderate concentration quenching.All the results indicate thatπ-πinteraction of porphyrin pendants plays a key role in association of PAM-TrPyP,and H-aggregates of porphyrins are mainly formed in the concentrated solution.On the other hand,dynamic light scattering(DLS) and transmission electron microscopy(TEM) were used to follow the changes in size and structure of the macromolecular assemblies with the concentration increase.The polymer aggregation conformation changes from loose "vesicle-like" morphology to solid globule accordingly.When pH value of solution decreases to 4.3,pyridine moieties on porphyrin pendants could be protonated and the H-aggregates formed in macromolecular matrix are destroyed by electrostatic repulsion interactions. 展开更多
关键词 PORPHYRIN Water-soluble polymer π-πInteractions H-AGGREGATE PH-SENSITIVITY
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Alcohol/water-soluble porphyrins as cathode interlayers in high-performance polymer solar cells 被引量:1
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作者 Tao Jia Weilong Zhou +5 位作者 Fenghong Li Yajun Gao Lu Wang Jianxiong Han Jingying Zhang Yue Wang 《Science China Chemistry》 SCIE EI CAS CSCD 2015年第2期323-330,共8页
Three alcohol/water-soluble porphyrins, Zn-TPyPMeI: zinc(II) meso-tetra(N-methyl-4-pyridyl) porphyrin tetra-iodide, Zn- TPyPAdBr: zinc(II) meso-tetra[1-(1-adamantylmethyl ketone)-4-pyridyl] porphyrin tetra-b... Three alcohol/water-soluble porphyrins, Zn-TPyPMeI: zinc(II) meso-tetra(N-methyl-4-pyridyl) porphyrin tetra-iodide, Zn- TPyPAdBr: zinc(II) meso-tetra[1-(1-adamantylmethyl ketone)-4-pyridyl] porphyrin tetra-bromide and MnC1-TPyPAdBr: man- ganese(III) meso-tetra[1-(1-adamantylmethyl ketone)-4-pyridyl] porphyrin tetra-bromide were employed as cathode interlayers to fabricate polymer solar cells (PSCs). The PCvaBM ([6,6]-phenyl C71 butyric acid methyl ester) and PCDTBT (poly[N-9"- hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',3'-benzothiadiazole)])-blend films were used as active layers in polymer solar cells (PSCs). The PSCs with alcohol/water-soluble porphyrins interlayer showed obviously higher power con- version efficiency (PCE) than those without interlayers. The highest PCE, 6.86%, was achieved for the device with MnCl- TPyPAdBr as an interlayer. Ultraviolet photoemission spectroscopic (UPS), carrier mobility, atomic force microscopy (AFM) and contact angle (0) characterizations demonstrated that the porphyrin molecules can result in the formation of interfacial dipole layer between active layer and cathode. The interfacial dipole layer can obviously improve the open-circuit voltage (Voc) and charge extraction, and sequentially lead to the increase of PCE. 展开更多
关键词 polymer solar cells cathode interlayer alcohol/water-soluble porphyrins
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A Water-soluble Conjugated Polymer for Thiol Detection Based on "Tu rn-off" Effect
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作者 Gaoshan Zeng Jie Li +7 位作者 Hao Liang Yan Yuan Xiang Li Chao Yin Zhen Yang Quli Fan Xiaomei Lu Wei Huang 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2015年第8期881-887,共7页
We investigated a novel water-soluble conjugated polymer (WSCP) for thiol detection based on "turn-off" ef- fect. This WSCP was modified with poly(ethylene glycol) (PEG) by disulfide linkages to achieve good s... We investigated a novel water-soluble conjugated polymer (WSCP) for thiol detection based on "turn-off" ef- fect. This WSCP was modified with poly(ethylene glycol) (PEG) by disulfide linkages to achieve good solubility in aqueous solution (34 mg/mL) and high quantum yield (0.47). The separation of water-soluble PEG chains from the conjugated backbone induced by the cleavage of the disulfide linkages would lead to a significant decrease of the water solubility and a dramatical fluorescence quenching of the probe. The combined intuitive images and fluores- cence spectrophotometer further confirmed that decreased solubility produced an aggregation of the hydrophobic conjugated backbone. The fluorescence intensity of the probe showed a good linear relationship with glutathione (GSH) (1-200 nmol·L^-1), and the detection limit was 16 nmol·L^-1. This WSCP probe was confirmed to be a good sensing material with high selectivity to thiols by testing various biological molecules. And this WSCP probe ex- hibited good detection effect to intracellular thiols by testing Hela cells. Considering the good sensitivity and selec- tivity, the probe could be further used in vivo. In conclusion, this conjugated polymer probe made up for the draw- backs of the micromolecue probes and contributed to the development of new probes based on conjugated poly- mers. 展开更多
关键词 THIOLS DISULFIDE WATER-SOLUBLE conjugated polymer poly(ethylene glycol)
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Water-soluble crosslinked β-cyclodextrin polymer inclusion complexes with C60
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作者 刘勇 王丽芬 章道道 《Chinese Science Bulletin》 SCIE EI CAS 1995年第20期1759-1760,共2页
At present, using cyclodextrins or cyclodextrin derivatives with suitable internal annular dimension to embed C60 so as to form inclusion complexes has been one of the main ways to improve C60's water-solubility. In ... At present, using cyclodextrins or cyclodextrin derivatives with suitable internal annular dimension to embed C60 so as to form inclusion complexes has been one of the main ways to improve C60's water-solubility. In three kinds of cyclodextrins (α-, β-, γ-CD), only γ-CD has cavity large enough to include C60 whereas α-, and β-CD have not. In the case of DMβCD, the "out-stretching" methyl groups enlarge the cavity so that it can include C60. Starting from the same thought, we use epichlorohydrin crosslinked 展开更多
关键词 CDP In cyclodextrin polymer inclusion complexes with C60 Water-soluble crosslinked
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STUDY ON THE CONFORMATIONAL PROPERTIES OF RIGID POLYELECTROLYTE SPU IN SOLUTION
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作者 谢志明 李卓美 梁国眉 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1991年第3期273-277,共5页
The conformation and dimension of SPU polyanion have been studied by viscosity and quasi-elastic light scattering methods. The rigidity of SPU is somewhat similar to CMC and its hydrodynamic radius decreases only slow... The conformation and dimension of SPU polyanion have been studied by viscosity and quasi-elastic light scattering methods. The rigidity of SPU is somewhat similar to CMC and its hydrodynamic radius decreases only slowly with increasing concentration of NaCl. 展开更多
关键词 POLYELECTROLYTE Water-soluble polymer polymer solution
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Metal-free multicomponent polymerization toward cationic polyamidines
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作者 Meng Du Ming Li +1 位作者 Wangze Song Nan Zheng 《Chinese Chemical Letters》 SCIE CAS CSCD 2022年第5期2643-2647,共5页
Cationic polymers,also known as polycations,are considered to be the most potential non-viral gene carriers due to their unique advantages such as the ability to bind the negative charge of nucleic acid molecules.Mult... Cationic polymers,also known as polycations,are considered to be the most potential non-viral gene carriers due to their unique advantages such as the ability to bind the negative charge of nucleic acid molecules.Multicomponent polymerization(MCP)is a one-step,tandem strategy to construct complex structures based on multicomponent reactions.Herein,we developed a metal-free MCP method based on three monomers of p-dinitrovinylbenzene(p-DNVB),1,1-dimethylethyl N,N-dibromocarbamate(BocNBr_(2)),and bis-secondary-amines with a ratio of 1:2:1,to access a library of Boc-substituted polyamidines with well-defined structures and suitable molecular weights(M w ranging from 4400Da to 11,000Da)in high yields(up to 85%)under mild conditions.Upon the removal of Boc groups,a series of water-soluble polymers with cationic property were prepared and their gene binding capability was further evaluated. 展开更多
关键词 XMulticomponent polymerization METAL-FREE Cationic polymer Polyamidine WATER-SOLUBLE
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STRUCTURE-PROPERTY RELATIONSHIP OF POLYELECTROLYTES AND ITS APPLICATION IN STABILIZING DRILLING-MUD IN PRESENCE OF SALTS
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作者 李卓美 张雪馨 +1 位作者 谢志明 黄玉惠 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1990年第3期204-210,共7页
A new polyelectrolyte (SPU) has been prepared. It can depress the water-loss of drilling-mud much more effective than the commonly used acrylic polyelectrolytes even in 30% NaCl solution. SPU has phenyl group in the b... A new polyelectrolyte (SPU) has been prepared. It can depress the water-loss of drilling-mud much more effective than the commonly used acrylic polyelectrolytes even in 30% NaCl solution. SPU has phenyl group in the backbone with -SO_3^- in the side chain while the acrylic polyelectrolytes have C—C and -COO^- respectively, there exists an intrinsic relationship between the structure of polymer and its tolerance to salts, it has been found: 1) The adsorption amount of polymer on clay is related closely to the flexibility of polymer chain. 2) The salt-tolerance of -SO_3^- is superior to -COO-. 3) Both SPU-mud and HPAN-mud are plastic fluids. The dependence of yield point on salts relates to the molecular weight of polymer and hydration of ionogenic group, which is quite different for SPU-mud and HPAN-mud. 4 ) The extent of raising zeta-potential of base-mud by SPU is greater than by HPAN, but the extent of dropping zeta-potential of SPU-mud by NaCI is smaller than HPAN-mud. According to these results we suppose the salt-tolerance of SPU-mud is attributed mainly to hydration of -SO_3^- and that of HPAN-mud mainly to network structure formed in the drilling-mud. 展开更多
关键词 POLYELECTROLYTE Water-soluble polymer Drilling-mud
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Water Soluble Amino Grafted Silicon Nanoparticles and Their Use in Polymer Solar Cells
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作者 Quan-xiang Yan Zhuo-wei Gu +6 位作者 Qi Li Wei-fei Fu Xiao-qiang Chen Wen-qing Liu Hong-bin Pan Mang Wang 陈红征 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2014年第4期395-401,共7页
Stable aqueous amino-grafted silicon nanoparticles (SiNPs-NH2) were prepared via one-pot solution method. By grafting amino groups on the particle surface, the dispersion of SiNPs in water became very stable and cle... Stable aqueous amino-grafted silicon nanoparticles (SiNPs-NH2) were prepared via one-pot solution method. By grafting amino groups on the particle surface, the dispersion of SiNPs in water became very stable and clear aqueous solutions could be obtained. By incorporating SiNPs-NH2 into the hole transport layer of poly(3,4- ethylenedioxythiophene)/polystyrene sulfonic acid (PEDOT'PSS), the performance of polymer solar cells composed of poly[2-methoxy,5-(2'-ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV):[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as active layer can be improved. SiNPs-NH2 are dispersed uniformly in the PEDOT:PSS solution and help form morphologies with small-sized domains in the PEDOT:PSS film. SiNPs-NH2 serve as screens between conducting polymer PEDOT and ionomer PSS to improve the phase separation and charge transport of the hole transport layer. As a result, the sheet resistance of PEDOT:PSS thin films is decreased from (93 ±5) × 10^5 to (13 ± 3) × 10^5 Ω/□. The power conversion efficiency (PCE) of polymer solar cells was thus improved by 9.8% for devices fabricated with PEDOT'PSS containing 1 wt% of SiNPs-NH2, compared with the devices fabricated by original PEDOT:PSS. 展开更多
关键词 SiNPs-NH2 WATER-SOLUBLE Phase separation polymer solar cells Transport.
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An Alternative Way towards Preparation of Hydrophobically Associating Polyacrylamide: Chemical Post-Modification
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作者 FENG Yu-jun 《合成化学》 CAS CSCD 2004年第z1期86-86,共1页
关键词 hydrophobically associating polyacrylamide CHEMICAL post-modification WATER-SOLUBLE polymer
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Water-soluble phosphate-functionalized polyfluorene as fluorescence biosensors toward cytochrome c 被引量:1
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作者 QIN ChuanJiang TONG Hui WANG LiXiang 《Science China Chemistry》 SCIE EI CAS 2009年第6期833-839,共7页
An anionic water-soluble polyfluorene derivative, poly(9,9-bis(6′-phosphatehexyl)fluorene-alt-1,4-pheny lene) sodium salt (PFHPNa), was synthesized by Suzuki coupling reaction in DMF/water. Polymer PFHPNa was well so... An anionic water-soluble polyfluorene derivative, poly(9,9-bis(6′-phosphatehexyl)fluorene-alt-1,4-pheny lene) sodium salt (PFHPNa), was synthesized by Suzuki coupling reaction in DMF/water. Polymer PFHPNa was well soluble in water with a strong blue fluorescence emission. Effect of the side chain length on fluorescence sensory properties was studied by comparing quenching efficiencies toward different quenchers of PFHPNa with a reported polymer poly(9,9-bis(3′-phosphatepropyl)fluorene-alt-1,4-phenylene) sodium salt (PFPPNa), which have different side chains in length. For small molecular quenchers (methylviologen, MV2+) and meso-5,10,15,20-tetrakis-(N-methyl-4-pyridyl)porphine (TMPyP4), polymer PFHPNa had lower sensitivity due to the much longer side chain length. The positively charged metalloprotein cytochrome c could quench fluorescence of conjugated polymers via energy transfer and electron transfer. Moreover, polymer PFHPNa showed higher fluorescence quenching toward large biomolecules than PFPPNa. The corresponding Stern-Volmer (Ksv) value of polymer PFHPNa was determined to be 2.1×108 M-1 for cytochrome c. It could be used as a sensitive and selective fluorescence sensor for protein cytochrome c. 展开更多
关键词 CONJUGATED polymer FLUORESCENCE sensor WATER-SOLUBLE side chain
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