期刊文献+
共找到175篇文章
< 1 2 9 >
每页显示 20 50 100
NOVEL HYPERBRANCHED POLY(AMINE-ESTER) FILMS: PREPARATION, CHARACTERIZATION AND PROPERTIES
1
作者 Xiu-zhen Wei 朱宝库 Ling Xiao You-yi Xu 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2006年第3期291-297,共7页
Crosslinked film of hyperbranched poly(amine-ester) (HPAE) was prepared by crosslinking its terminal hydroxyl groups with glutaraldehyde (GA). Atom force microscope (AFM) and scanning electron microscope (SEM... Crosslinked film of hyperbranched poly(amine-ester) (HPAE) was prepared by crosslinking its terminal hydroxyl groups with glutaraldehyde (GA). Atom force microscope (AFM) and scanning electron microscope (SEM) reveals that they have smooth surfaces, dense and homogenous matrices. It was found that the water static contact angle is smaller than 41.7°, the tensile strength is higher than 8.9 MPa, the elongation at break is higher than 5.1%, the swelling degree is higher than 42% in water, and the Bovine hemoglobin (Hb) adsorption is relatively low. These results indicate that the crosslinked HPAE films might have some potential applications in many areas. 展开更多
关键词 CROSSLINKING hyperbranched poly(amine-ester GLUTARALDEHYDE Films.
下载PDF
Effect of Hyperbranched Poly(amine-ester) Grafted Nano-SiO_2 on Reinforcement and Toughness of PVC 被引量:2
2
作者 李杰 赵辉 +1 位作者 孙瑞敏 罗运军 《Journal of Beijing Institute of Technology》 EI CAS 2008年第1期104-108,共5页
Nano-SiO2 was modified using silane coupling agent (KH-550) and hyperbranched poly(amine-ester) respectively, and Poly(vinyl chloride) (PVC)/modified nano-SiO2 composites were made by melt-blending. The compos... Nano-SiO2 was modified using silane coupling agent (KH-550) and hyperbranched poly(amine-ester) respectively, and Poly(vinyl chloride) (PVC)/modified nano-SiO2 composites were made by melt-blending. The composites' structures andmechanical properties were characterized by transmission electron microscopy(TEM), sanning electronic microscopy(SEM) and electronic universal testing machine. The results. show that nano-SiO2 grafted by hyperbranched poly (amine-ester) increases obviously in dispersion in PVC matrix, and mechanical properties of PVC are effectively improved. Moreover, it was found that mechanical properties of PVC/nano-SiO2 composites reach the best when weight percent of nano-SiO2 in PVC matrix is 1%. Compared with crude PVC, the tensile strength of hyperbranched poly (amine-ester) grafted nano-SiO2/ PVC composite increases by 24.68 % and its break elongation, flexural strength and impact strength increase by 15.73%, 4.07% and 1 841.84%, respectively. Moreover, the processing of the composites is improved. 展开更多
关键词 NANO-SIO2 hyperbranched poly (amine-ester one-step polycondensation dispersion and stability
下载PDF
Utilization of Trimethylolpropane Based Hyperbranched Poly(Amine-Ester) as New Polymeric Admixture
3
作者 Amal Amin Ibrahim Ahmed El-Sayed Abdel-Magied +1 位作者 Mohamed Sayed Selim Magdy Mohamed Hussein Ayoub 《Open Journal of Organic Polymer Materials》 2012年第2期23-28,共6页
Hyperbranched poly(amine-ester) (HBPAE) was synthesized via pseudo-one-step process between trimethylolpropane as a core molecule and N, N-diethylol-3-amine methylpropionate as the AB2 branched monomer. The prepared p... Hyperbranched poly(amine-ester) (HBPAE) was synthesized via pseudo-one-step process between trimethylolpropane as a core molecule and N, N-diethylol-3-amine methylpropionate as the AB2 branched monomer. The prepared polymer was analyzed by IR, GPC, 1H-NMR and thermal analysis (TGA and DSC). The performance of the polymer in cement was tested by measuring the effect of 1, 3 and 5 wt% of HBPAE solutions on the properties of Ordinary Portland Cement. Water of consistency, setting times, bulk density, apparent porosity, compressive strength and combined water content of the polymer/cement pastes were studied. The results showed that water of consistency and apparent porosity decreased while setting times, compressive strength, combined water and bulk density increased with the polymer addition. 展开更多
关键词 hyperbranched polymers poly(amine-ester) Ordinary Portland Cement COMPRESSIVE Strength
下载PDF
STUDY OF NANOSIZED SILICA GRAFIED WITH HYPERBRANCHED POLY(AMINE-ESTER)
4
作者 ZHAO Hui YANG Shu LUO Yunjun 《Chinese Journal of Reactive Polymers》 2006年第1期86-89,共4页
A new method to chemically modify the surface of nanosized-SiO2 was studied in this paper.Nanosized-SiO2 was grafted with hyperbranched poly(amin ester)through one-spot polycondensation between AB2 monomer and active ... A new method to chemically modify the surface of nanosized-SiO2 was studied in this paper.Nanosized-SiO2 was grafted with hyperbranched poly(amin ester)through one-spot polycondensation between AB2 monomer and active hydroxyl on silica surface in present of catalyst.Compared with the results of FTIR and TEM,it is found hyperbranched poly(amin ester)is successfully grafted on the surface of nanosized-SiO2 and the surface properties have been changed with an expected way.The results indicate that nanosized-SiO2 grafted with hyperbranched poly(amin ester)has better dispersion in the ethanol or chloroform than that unmodified. 展开更多
关键词 hyperbranched poly(amin-ester) Nanosized Silica Surface Modification dispersion stability.
下载PDF
SYNTHESIS OF HYPERBRANCHED CONJUGATIVE POLY(ARYLENEETHYNYLENE)S BY ALKYNE POLYCYCLOTRIMERIZATION 被引量:3
5
作者 HanPeng Rong-huaZheng +2 位作者 Hong-chenDong De-minJia Ben-zhongTangb 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2005年第1期1-3,共3页
A series of new hyperbranched poly(aryleneethynylene)s are synthesized by the copolycyclotrimerizations oftetraynes(Ⅰand Ⅱ)with aliphatic monoynes(A-C)catalyzed by tantalum-,niobium-,and cobalt-based catalysts.All t... A series of new hyperbranched poly(aryleneethynylene)s are synthesized by the copolycyclotrimerizations oftetraynes(Ⅰand Ⅱ)with aliphatic monoynes(A-C)catalyzed by tantalum-,niobium-,and cobalt-based catalysts.All thereactions proceed smoothly and soluble polymers of high molecular weights(M_w up to 3.8×10~4)are obtained in high yields(up to 97%). 展开更多
关键词 polycyclotrimerization hyperbranched polymers poly(aryleneethynylene)s.
下载PDF
Aliphatic Hyperbranched Poly(amido amine)s (PAMAMs): Preparation and Modification 被引量:2
6
作者 LIUCui-hua GAOChao YANDe-yue 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第3期345-354,共10页
A series of water soluble aliphatic hyperbranched poly(amido amine)s(PAMAMs) with the same or similar chemical structure of poly(amido amine) dendrimer was successfully synthesized from commercially available AB and C... A series of water soluble aliphatic hyperbranched poly(amido amine)s(PAMAMs) with the same or similar chemical structure of poly(amido amine) dendrimer was successfully synthesized from commercially available AB and C_n types of monomers by one-pot polymerization via the couple-monomer methodology(CMM). The AB type monomer used in this paper was methyl acrylate, and C_n monomers were multi-amino compounds such as ethylenediamine(EDA), diethylenetriamine(DETA), triethylenetetraamine(TETA), tetraethylenepentaamine(TEPA) and pentaethylenehexamine(PEHA). The reaction mechanism was investigated by means of the mass spectra of the reaction intermediates. Adjusting the feed ratio of AB to C_n, hyperbranched polymers with different terminal groups and properties were obtained. FTIR, NMR, DSC, and TGA were used to characterize the polymers. It was found that the polymers′ properties such as solubility, thermal behaviour and encapsulation capability varied with changing the feed ratio of AB to C_n. Benzoyl and palmitoyl groups were introduced into these macromolecules by acidylation to form amphiphilic hyperbranched polymers which have a high capability to encapsulate water soluble dyes such as Congo red. It is expected that the hyperbranched PAMAMs can play an important role in the industrial applications, such as coatings, cross-linking and phase-transferring agents because of their versatility and availability. 展开更多
关键词 hyperbranched poly(amido amine) Acidylation AMPHIPHILICITY ENCAPSULATION
下载PDF
Hyperbranched Poly(amide-ester) Mildly Synthesized and Its Characterization 被引量:2
7
作者 陈庆华 陈荣国 +2 位作者 肖荔人 钱庆荣 章文贡 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2008年第7期877-883,共7页
AB2-type-prepolymerized monomer was rapidly (2 h) prepared at room temperature (25 ℃) using commercially available maleic anhydride (MA) and diethanolamine (DEA) as raw materials. By employing toluene-p-sulfo... AB2-type-prepolymerized monomer was rapidly (2 h) prepared at room temperature (25 ℃) using commercially available maleic anhydride (MA) and diethanolamine (DEA) as raw materials. By employing toluene-p-sulfonic acid as a catalyzer, a series of hyperbranched poly(amide-ester) (HBPAE) were successfully synthesized from prepared AB2 monomer by solution condensation polymerization through "one-step process" or "pseudo one-step process" (using pentaerythritol as a center core). The processes were carried out at high temperature of 120 ℃ for 6 h in air atmosphere (inert protection free) with reduced pressure distillation (0.08--0.096 MPa). The results of FT-IR, UV-Vis, TGA, and intrinsic viscosity testing by Ubbelodhe viscometer showed that the prepared HBPAEs possess three-dimensional configuration with unsaturated conjugate structure, large numbers of branches and numerous terminal hydroxyl groups. These result in their low viscosity, high solubility and thermal stability. 展开更多
关键词 maleic anhydride DIETHANOLAMINE AB2-type-prepolymerized monomer hyperbranched poly(amide-ester) one-step process pseudo one-step process
下载PDF
SYNTHESIS AND CHARACTERIZATION OF HYPERBRANCHED POLY(ESTER-AMIDE)S BASED ON GALLIC ACID AND DL-2-AMINOBUTYRIC ACID 被引量:1
8
作者 李悦生 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2004年第1期1-5,共5页
A novel AB3-type monomer was prepared from gallic acid and DL-2-aminobutyric acid, and used for the synthesis of the biocompatible hyperbranched poly(ester-amide)s by self-polycondensation. The polymers were character... A novel AB3-type monomer was prepared from gallic acid and DL-2-aminobutyric acid, and used for the synthesis of the biocompatible hyperbranched poly(ester-amide)s by self-polycondensation. The polymers were characterized via FTIR and NMR spectroscopy and thermal analysis, and the average degree of branching of the polymers was estimated to be 0.75. The polymers with abundant acetyl end groups were found to be amorphous with lower intrinsic viscosity, better thermal stability and excellent solubility. 展开更多
关键词 hyperbranched polymer BIOCOMPATIBLE Gallic acid hyperbranched poly(ester-amide)s
下载PDF
NOVEL HYPERBRANCHED POLY(PHENYLENE OXIDE)S WITH PHENOLIC TERMINAL GROUPS: EFFECTS OF REACTION TIME AND CORE MOLECULES ON THE MOLECULAR WEIGHT AND POLYDISPERSITY 被引量:1
9
作者 李效玉 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2006年第4期413-419,共7页
A novel hyperbranched poly(phenylene oxide) (HPPO) with phenolic terminal groups was prepared from 4-bromo-4',4"-dihydroxytriphenylmethane as AB2 monomer in dimethylsulfoxide (DMSO) via a modified Ullmann reac... A novel hyperbranched poly(phenylene oxide) (HPPO) with phenolic terminal groups was prepared from 4-bromo-4',4"-dihydroxytriphenylmethane as AB2 monomer in dimethylsulfoxide (DMSO) via a modified Ullmann reaction. The molecular weight and polydispersity (PD) of the resulting polymers increased with increasing reaction time. In the presence of core molecules (bisphenol A and 1,3,5-trihydroxybenzene), which have the similar molecular backbones to the reactive monomer, the molecular weight could be controlled by varying the core-to-monomer ratio. Incorporation of a very small amount of core molecules could lead to a higher molecular weight as compared with that without the addition of core molecules. However, when the core content reached certain extent, the molecular weight would decrease with the further increase in the core content. A new similar behavior of control over the PD was also obtained. The resulting polymers were characterized by ^1H-NMR, ^13C-NMR, FT-IR, and GPC. 展开更多
关键词 hyperbranched poly(phenylene oxide) Controlled reaction Core molecule.
下载PDF
New Phase Transfer Agent for Dye: Application for Hyperbranched Poly (ester-amine) 被引量:1
10
作者 TengQIU LiMingTANG XinLinTUO DeShanLIU 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第8期931-934,共4页
Hydrophilic hyperbranched poly(ester-amine) (HPEA) synthesized from diethanolamine and methyl acrylate was used as phase transfer agent for the first time to transfer methyl orange (MO) from water into chloroform. Thi... Hydrophilic hyperbranched poly(ester-amine) (HPEA) synthesized from diethanolamine and methyl acrylate was used as phase transfer agent for the first time to transfer methyl orange (MO) from water into chloroform. This process was quantified by UV-Vis spectra. A possible mechanism was put forward based on the formation of amphiphilic aggregates. 展开更多
关键词 hyperbranched poly(ester-amine) phase transfer agent dye.
下载PDF
HYPERBRANCHED AROMATIC POLYMERS OBTAINED VIA SELF-CONDENSATION
11
作者 Xi Zhang Yong-ming Chen +5 位作者 Dong-yan Wang Jing Jiang Hong-wei Liu Chuan-fu Chen Fu Xi Center for Molecular Science, Institute of Chemistry Chinese Academy of Sciences, Beijing 100080, China The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation, Nankai University Tianjin 300071, China 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2001年第5期517-520,共4页
Hyperbranched aromatic polymers were prepared by Friedel-Crafts reaction with Lewis acid, AlCl3 and ZnCl2, as the catalysts. In this work, hyperbranched polybenzyl (PB) and poly(methylene)naphthalene (PN) were synthes... Hyperbranched aromatic polymers were prepared by Friedel-Crafts reaction with Lewis acid, AlCl3 and ZnCl2, as the catalysts. In this work, hyperbranched polybenzyl (PB) and poly(methylene)naphthalene (PN) were synthesized and characterized by H-1-NMR and GPC. In addition, their florescence properties were measured with steady-state florescence spectra in THF and ethylene dichloride. The quantum yields of polybenzyl and poly(methylene)naphthalene in ethylene dichloride are much larger than those in THE. 展开更多
关键词 hyperbranched polymer polybenzyl poly(methylene)naphthalene fluorescent spectra
下载PDF
Facile Route to Aromatic Hyperbranched Poly(ester amines)
12
作者 ZHANG Zheng-hui SHI Wen-fang 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2009年第3期400-403,共4页
The aromatic hyperbranched poly(ester amines)(AHPEAs) were successfully synthesized via the mild condensation of N-4-cyanobenzyl diethanolamine hydrogenchloride as an AB2 monomer in concentrated HCI. The polymeriz... The aromatic hyperbranched poly(ester amines)(AHPEAs) were successfully synthesized via the mild condensation of N-4-cyanobenzyl diethanolamine hydrogenchloride as an AB2 monomer in concentrated HCI. The polymerization was monitored by FTIR to suppose the reasonable reaction mechanism. The degree of branching was determined to be 0.55 by 1H NMR with an increased conversion of up to 96%. The glass transition temperature was measured by differential scanning calorimetry to range from -19 to 15℃ The molecular weights and polydispersities were investigated by gel permeation chromatography. 展开更多
关键词 hyperbranch poly(ester amine) 4-Cyanobenzyl chloride ALCOHOLYSIS
下载PDF
Investigation on the Structure and Curing Performances of Secondary Amine Terminated Hyperbranched Poly(ester-amine)s
13
作者 JIN Xin TANG Li-Ming YOU Hu 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2010年第7期1115-1121,共7页
Three secondary amine terminated hyperbranched poly(ester-amine)s (defined as HPEA1, HPEA2 and HPEA3) were synthesized from piperazine (A2) and trimethylolpropane triacrylate (TMPTA, B3) at their molar ratios ... Three secondary amine terminated hyperbranched poly(ester-amine)s (defined as HPEA1, HPEA2 and HPEA3) were synthesized from piperazine (A2) and trimethylolpropane triacrylate (TMPTA, B3) at their molar ratios of 2.5:1, 2.25:1 and 2.0:1, respectively. The polymers were analyzed by 1H NMR, GPC, DSC and TGA. The results indicated that the ratio of secondary amine to tertiary amine and the content of secondary amine decreased, while the molecular weight, molecular weight distribution and glass transition temperature (Tg) increased from HPEA1 to HPEA3. Due to their reactive terminal groups and flexible chains, these polymers further reacted with an epoxy resin (E51) to form cured films under ambient conditions. With increasing the ratio between secondary amine groups and epoxy groups from 1:2 to 2:1, the gel content, film hardness and onset decomposing temperature of the cured samples increased. The good film performances should make the polymers as the components of non-solvent coating materials. 展开更多
关键词 hyperbranched poly(ester-amine) STRUCTURE epoxy resin curing film
下载PDF
Novel Method of Hyperbranched Polymer Modified Nano-SiO_2-Grafting Hyperbranched Poly(amide-ester) from Nano-SiO_2 by One-Step Polycondensation
14
作者 赵辉 李杰 +1 位作者 孙瑞敏 罗运军 《Journal of Beijing Institute of Technology》 EI CAS 2008年第1期100-103,共4页
A new method of surface chemical modification of nano-SiO2 is proposed in this paper. In the presence of catalyst, the active hydroxyl groups on the surface of nano-SiO2 reacted with AB2-type monomer (N, N-dihydroxye... A new method of surface chemical modification of nano-SiO2 is proposed in this paper. In the presence of catalyst, the active hydroxyl groups on the surface of nano-SiO2 reacted with AB2-type monomer (N, N-dihydroxyethyl-3-amino methyl propionate) by one-step polycondensation. And the product's Fourer transform infrared (FTIR) graphs and transmission electron microscopy(TEM) images proved that hyperbranched poly (amine-ester) was grafted on nano-SiO2 surface successfully. Results show that the modified nano-SiO2 exhibits excellent dispersion and stability in some solvents such as alcohol and chloroform. 展开更多
关键词 NANO-SIO2 hyperbranched poly (amide-ester) one-step polycondensation dispersion and stability
下载PDF
Fluorinated Hyperbranched Poly(urea-urethane)s Containing Reactive Groups: Synthesis, Characterization and Application on Cotton Fabric
15
作者 汤威宜 黄焰根 卿凤翎 《Journal of Donghua University(English Edition)》 EI CAS 2011年第3期233-238,共6页
A series of hyperbranched poly(urea-urethane)s (HPUs) containing short fluoroalkyl chain and reactive groups (HPUFs) capable as hydrophobic and oleophobic coating materials were synthesized. The obtained polymers were... A series of hyperbranched poly(urea-urethane)s (HPUs) containing short fluoroalkyl chain and reactive groups (HPUFs) capable as hydrophobic and oleophobic coating materials were synthesized. The obtained polymers were characterized by FTIR(fouier transform-infrared spectroscopy), 1H NMR(nuclear magnetic resonance), 13C NMR, 19F NMR, GPC(gel permeation chromatography), TGA(thermogravimetric analyzer), and XPS(X-ray photoelectron spectroscopy) analyses. Highly hydrophobic and oleophobic cotton fabrics could be achieved from these fluorinated hyperbranched polymers by solution-immersion coating method. The static contact angles reached to 143°, 114°, and 92° for water, hexadecane, and decane, respectively. The water and oil repellency ratings were 90 and 6, respectively, and still kept 80 and 5, respectively, after 10 soaping cycles at 50℃. 展开更多
关键词 hyperbranched poly(urea-urethane)s FLUOROpolyMER coatings HYDROPHOBIC oleophobic
下载PDF
Synthesis and application of a novel star-hyperbranched poly(acrylic acid) for improved dental restoratives
16
作者 Jun Zhao Yiming Weng Dong Xie 《Journal of Biomedical Science and Engineering》 2010年第11期1050-1060,共11页
A new star-hyperbranched poly(acrylic acid) has been synthesized and incorporated into dental glassionomer cement for enhanced mechanical strengths. The effects of arm number and branching on viscosity of the polymer ... A new star-hyperbranched poly(acrylic acid) has been synthesized and incorporated into dental glassionomer cement for enhanced mechanical strengths. The effects of arm number and branching on viscosity of the polymer aqueous solution and mechanical strengths of the formed experimental cement were evaluated. It was found that the higher the arm number and the more the branching, the lower the viscosity of the polymer solution as well as the mechanical strengths of the formed cement. It was also found that the experimental cement exhibited significantly higher mechanical strengths than commercial Fuji II LC. The experimental cement was 51% in CS, 55% in compressive modulus, 118% in DTS, 82% in FS, 18% in FT and 85% in KHN higher than Fuji II LC. The experimental cement was only 6.7% of abrasive and 10% of attritional wear depths of Fuji II LC in each wear cycle. It appears that this novel experimental cement is a clinically attractive dental restorative and may potentially be used for high-wear and high-stress-bearing site restorations. 展开更多
关键词 Star-hyperbranched poly(Acrylic Acid) Light-Cured GLASS-IONOMER Cement ATOM-TRANSFER Radical polymerization Mechanical Strength
下载PDF
Reaction and characterization of crosslinking hyperbranched poly(amine-ester) with succine anhydride
17
作者 XIAO Ling WEI Xiuzhen ZHU Baoku 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2007年第4期355-359,共5页
Basing on hydroxyl terminated hyperbranched poly(amine-ester)s(HPAEs),the cross-linking reactions and preparation of ester-crosslinked HPAE films were inves-tigated using succine anhydride(SA)as crosslink reagent.It w... Basing on hydroxyl terminated hyperbranched poly(amine-ester)s(HPAEs),the cross-linking reactions and preparation of ester-crosslinked HPAE films were inves-tigated using succine anhydride(SA)as crosslink reagent.It was proved that the cross-linking reaction between HPAE and SA followed a two-step mechanism.This mechanism provides an efficient route to prepare HPAE/SA cross-linked films,in which,the precursor films were prepared by casting HPAE/SA solution at a lower temperature,and then curing the films at a higher temperature.By varying SA content,the solid HPAE/SA films with different cross-linking degrees were prepared successfully.The highest tensile strength of the cross-linked film could reach 59.60 MPa.With all water contact angle smaller than 74.3°,the crosslinked films demonstrated good hydrophilic properties. 展开更多
关键词 hyperbranched poly(amine-ester) succine anhydride CROSS-LINK FILMS HYDROPHILICITY
原文传递
超支化芘基聚芳基哌啶阴离子交换膜及其碱性电解水应用
18
作者 房梓榆 刘莹莹 +3 位作者 陆陈宝 朱金辉 柯长春 庄小东 《功能高分子学报》 CAS CSCD 北大核心 2024年第4期277-286,共10页
以芘(py)为支化基团,基于对三联苯(TP)和N-甲基-4-哌啶酮(NM4P)单体,经强酸催化聚合得到超支化芘基聚三联苯哌啶聚合物(h-PTPE-py-n)。通过调整支化基团和三联苯的比例,可以得到不同支化度的超支化聚三联苯哌啶阴离子交换膜h-PTP-py-n... 以芘(py)为支化基团,基于对三联苯(TP)和N-甲基-4-哌啶酮(NM4P)单体,经强酸催化聚合得到超支化芘基聚三联苯哌啶聚合物(h-PTPE-py-n)。通过调整支化基团和三联苯的比例,可以得到不同支化度的超支化聚三联苯哌啶阴离子交换膜h-PTP-py-n。对该聚合物的化学结构、热性能、力学性能、离子传导性质进行了系统表征和测试,并将该类型膜应用于阴离子交换膜电解水(AEMWE)器件,评估其在实际工况下的运行基本表现。结果表明,芘引入导致的支化有效提高了阴离子交换膜的力学性能和尺寸稳定性,所制得的阴离子交换膜在80℃下的氢氧根离子传导率最高达到168.0 mS/cm,应用到AEMWE中时,h-PTP-py-n展示出了优异的导电性,在3 V条件下电流密度达到1.95 A/cm^(2),并且能稳定运行超过90 h。 展开更多
关键词 阴离子交换膜 超支化结构 碱性电解水 聚芳基哌啶
下载PDF
端羟基超支化聚(胺-酯)非共价改性氧化石墨烯 被引量:1
19
作者 孙瑞敏 周永恒 +3 位作者 郝延蔚 师兆忠 曹红霞 赵辉 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2023年第1期64-69,共6页
采用改进的Hummer方法制备了氧化石墨烯(GO),并利用端羟基超支化聚(胺-酯)对其非共价功能化。采用傅里叶变换红外光谱(FT-IR)、拉曼光谱(Raman)、X射线衍射(XRD)、扫描电镜(SEM)和热重分析(TG)及紫外可见分光光度等方法对氧化石墨烯表... 采用改进的Hummer方法制备了氧化石墨烯(GO),并利用端羟基超支化聚(胺-酯)对其非共价功能化。采用傅里叶变换红外光谱(FT-IR)、拉曼光谱(Raman)、X射线衍射(XRD)、扫描电镜(SEM)和热重分析(TG)及紫外可见分光光度等方法对氧化石墨烯表面改性的性能进行了分析。FT-IR,Raman,XRD和TG分析结果表明,超支化聚(胺-酯)分子成功改性了氧化石墨烯;XRD分析表明,随着超支化聚(胺-酯)含量的增加,石墨烯片层层间距增大,这说明超支化分子能够渗透插入到氧化石墨烯片层之间;Raman分析表明,吸附在氧化石墨烯表面的超支化聚(胺-酯)提高了氧化石墨烯表面的无序化程度和石墨烯结构的不完善程度。SEM形貌分析表明超支化聚(胺-酯)大分子覆盖在氧化石墨烯的表面上,且通过对改性前后氧化石墨烯在乙醇和正己烷中透光率的对比,表明改性后的氧化石墨烯分散性能得到了明显提高。 展开更多
关键词 端羟基超支化聚(胺-酯) 氧化石墨烯 非共价改性
下载PDF
高离子电导率及耐碱性聚三唑鎓盐薄膜的制备及性能
20
作者 别如烨 李瑜婧 +2 位作者 万里强 黄发荣 刘坐镇 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2023年第5期17-25,共9页
1,2,3-三唑鎓离子因不含酸性质子,耐碱稳定性良好,使得聚三唑鎓离子液体在聚电解质碱性电池离子交换膜等领域具有较好的应用潜力。文中将三炔正丁基-1,3,5-均苯三甲酸酯(TRBB)和端炔基聚乙二醇(DPPEG)与联苯二苄叠氮(BAMBP),通过1,3-偶... 1,2,3-三唑鎓离子因不含酸性质子,耐碱稳定性良好,使得聚三唑鎓离子液体在聚电解质碱性电池离子交换膜等领域具有较好的应用潜力。文中将三炔正丁基-1,3,5-均苯三甲酸酯(TRBB)和端炔基聚乙二醇(DPPEG)与联苯二苄叠氮(BAMBP),通过1,3-偶极环加成反应及N-烷基化和阴离子交换反应,制备了具有高离子电导率及良好耐碱稳定性的新型超支化型聚三唑鎓盐薄膜(TDB-PTAIM)。TDB-PTAIM玻璃化转变温度(Tg)为70.8~143.6℃,质量损失10%的温度(Td10)为295~315℃,30℃最高电导率可达2.92×10-5 S/cm,在已报道的聚三唑鎓盐离子液体中处于较高水平;同时,TDB-PTAIM表现出较好的耐碱稳定性,在80℃浓度为1 mol/L的NaOH溶液中浸泡24 h后,仍能保持良好的力学性能,拉伸强度为25.6~57.4 MPa,下降幅度为9%~41%,离子电导率下降幅度为14%~23%。TDB-PTAIM兼具较好的力学性能、较高的离子电导率和较好的耐碱性能,有望应用于碱性电池离子交换膜领域。 展开更多
关键词 聚三唑鎓盐薄膜 超支化 离子导电性 耐碱稳定性
下载PDF
上一页 1 2 9 下一页 到第
使用帮助 返回顶部