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海泡石矿物含量对海泡石/聚丙烯酸(钠)复合材料吸水保水性能的影响 被引量:5
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作者 栗海峰 范力仁 +3 位作者 徐志良 沈上越 宋吉青 李茂松 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2009年第1期59-62,共4页
利用水溶液聚合法制备了海泡石粘土/聚丙烯酸(钠)高吸水保水复合材料,研究了海泡石粘土在0%~10%及20%~150%添加量范围对复合材料的吸水保水、重复吸水及抗电解质溶液性能的影响。结果表明,海泡石添加量在4%和40%~60%范... 利用水溶液聚合法制备了海泡石粘土/聚丙烯酸(钠)高吸水保水复合材料,研究了海泡石粘土在0%~10%及20%~150%添加量范围对复合材料的吸水保水、重复吸水及抗电解质溶液性能的影响。结果表明,海泡石添加量在4%和40%~60%范围时,复合材料的吸蒸馏水倍率达到极大值。海泡石添加量大于60%时,复合材料吸水倍率急剧下降。复合材料的保水率随着海泡石添加量的增加而小幅增加;海泡石粘土添加量在40%~60%范围时,复合材料的重复吸水性能比较稳定;复合材料吸蒸馏水的倍率随各电解质溶液离子强度的升高而不断降低,且海泡石粘土添加量高的复合材料对外界溶液离子强度的敏感程度较高。 展开更多
关键词 非金属矿物倩分子高吸水保水复合材料 海泡石粘土 丙烯酸() 性能
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坡缕石/聚丙烯酸(钠)高吸水复合材料的溶胀行为 被引量:12
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作者 栗海峰 范力仁 +3 位作者 景录如 宋吉青 李茂松 田惠卿 《复合材料学报》 EI CAS CSCD 北大核心 2009年第3期24-28,共5页
以水溶液聚合法制备了坡缕石/聚丙烯酸(钠)(PAANa)高吸水复合材料,对复合材料的吸水溶胀性能进行了研究,并采用FTIR对复合材料进行表征。结果表明:10%坡缕石/PAANa复合材料吸蒸馏水和0.9 wt%盐水倍率分别达1666 g/g、115 g/g,较纯PAANa... 以水溶液聚合法制备了坡缕石/聚丙烯酸(钠)(PAANa)高吸水复合材料,对复合材料的吸水溶胀性能进行了研究,并采用FTIR对复合材料进行表征。结果表明:10%坡缕石/PAANa复合材料吸蒸馏水和0.9 wt%盐水倍率分别达1666 g/g、115 g/g,较纯PAANa的724 g/g、58 g/g明显提高;坡缕石/PAANa复合材料具有优异的保水及反复吸水性能;坡缕石/PAANa的吸液倍率随电解质溶液离子强度的升高而降低,降低程度顺序为Al3+>Ca2+>Na+;坡缕石/PAANa复合材料与其他6种矿物/PAANa复合材料相比,吸液性能特别是吸蒸馏水及0.9 wt%盐水性能大幅提高。 展开更多
关键词 坡缕石 矿物/聚丙烯酸() 高吸水复合材料 溶胀行为
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低分子量聚丙烯酸(钠)的研究及应用进展
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作者 程终发 李鹏飞 +3 位作者 吴长友 周靖仁 潘聪 岳席云 《水处理信息报导》 2014年第2期1-5,9,共6页
聚丙烯酸(钠)的用途与其分子量的大小有着密切的关系,而低分子量的聚丙烯酸(钠)具有良好的水溶性和较大的极性,能够结合水中的钙、镁等多价离子形成可溶的链状阴离子,因此,用其作水质稳定剂具有显著的防垢效果。本文综述了低分... 聚丙烯酸(钠)的用途与其分子量的大小有着密切的关系,而低分子量的聚丙烯酸(钠)具有良好的水溶性和较大的极性,能够结合水中的钙、镁等多价离子形成可溶的链状阴离子,因此,用其作水质稳定剂具有显著的防垢效果。本文综述了低分子量聚丙烯酸(钠)的聚合原理、作用机理、合成方法及其研究现状,并对其在各领域应用现状和前景作了简要介绍。 展开更多
关键词 低分子量 丙烯酸() 研究进展 阻垢剂 分散剂
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Adsorption of sodium polyacrylate at interface of dicalcium silicate-sodium aluminate solution 被引量:5
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作者 于海燕 潘晓林 +3 位作者 丁婷婷 张武 刘涵 毕诗文 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第10期2323-2326,共4页
The adsorption isotherm of sodium polyacrylate on dicalcium silicate(2CaO-SiO2) in sodium aluminate solution at 80 ℃ was studied.The type of surface adsorption of sodium polyacrylate is saturated adsorption,and the... The adsorption isotherm of sodium polyacrylate on dicalcium silicate(2CaO-SiO2) in sodium aluminate solution at 80 ℃ was studied.The type of surface adsorption of sodium polyacrylate is saturated adsorption,and the adsorption behavior belongs to L-type,according with the monolayer adsorption model of Langmuir equation.The surface coverage of sodium polyacrylate is 1.06 mol/μm2.The relation curve between the surface pressure and the molecular area of adsorption film was obtained by Gibbs formula.The variation of interfacial energy caused by adsorption as well as the relationship between the relation curve and the type of adsorption was discussed. 展开更多
关键词 sodium aluminate solution sodium polyacrylate dicalcium silicate INTERFACE ADSORPTION
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利用亚麻屑纤维素制备高吸水保水树脂的性能 被引量:3
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作者 谷肄静 王立娟 《东北林业大学学报》 CAS CSCD 北大核心 2009年第5期83-85,共3页
通过碱蒸煮的方法,从亚麻屑中分离出纤维素。以水溶液聚合法,将亚麻屑纤维素与丙烯酸接枝共聚合成高吸水保水树脂。通过FTIR、SEM分析和表征了所合成树脂的结构和形貌,并测试了吸水速率、保水速率、重复使用性能和分别吸收0.1%的N、P、... 通过碱蒸煮的方法,从亚麻屑中分离出纤维素。以水溶液聚合法,将亚麻屑纤维素与丙烯酸接枝共聚合成高吸水保水树脂。通过FTIR、SEM分析和表征了所合成树脂的结构和形貌,并测试了吸水速率、保水速率、重复使用性能和分别吸收0.1%的N、P、K肥水的性能。结果表明:合成的树脂是亚麻屑纤维素与丙烯酸的接枝共聚物,具有多孔结构,吸水速率较快。在30℃和60℃下干燥15h,合成的高吸水、保水树脂的保水率分别为66.53%和30.46%;在二次蒸馏水中重复第3次的吸水倍率能够达到1472.81g/g;在0.1%的KCl、尿素和过磷酸钙溶液中的吸水倍率分别为603.56、1844.63、10.91g/g。 展开更多
关键词 高吸水保水树脂 亚麻屑纤维素 丙烯酸()
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SYNTHESIS AND APPLICATION OF NEW DETERGENT BUILDER POLYACRYLATE SODIUM 被引量:1
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作者 张卫红 龙复 +2 位作者 冯亚青 渠毅 王洪云 《Transactions of Tianjin University》 EI CAS 1998年第1期102-106,共5页
The low molecular weight polyacrylate sodium (PAA Na) detergent builder was synthesized with K 2S 2O 8 as initiator in a neutral aqueous medium. The influences of reaction conditions on the viscosity average molec... The low molecular weight polyacrylate sodium (PAA Na) detergent builder was synthesized with K 2S 2O 8 as initiator in a neutral aqueous medium. The influences of reaction conditions on the viscosity average molecular weight were studied. The critical value of synthetic PAA Na inhibiting the precipitation of CaCO 3 was determined and compared with that of other common builders. It is confirmed from SEM graphs that PAA Na can make CaCO 3 crystal defective. Washing tests show synthetic PAA Na can partially replace sodium tripolyphosphate (STPP) and is a potential polymeric detergent builder in low phosphate powder detergents. 展开更多
关键词 polyacrylate sodium low molecular weight detergent builder DETERGENCY
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超强吸水剂对大鼠的毒性作用
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作者 熊平 蒋灵芝 +1 位作者 曾鑫年 陈均湛 《毒理学杂志》 CAS CSCD 北大核心 2006年第6期398-400,共3页
关键词 淀粉接枝聚丙烯酸() 灭鼠 机制
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Pretreatment of poly(acrylic acid) sodium by continuous diafiltration and time revolution of filtration potential 被引量:4
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作者 XU Jing-yuan TANG Shu-yun QIU Yun-ren 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第3期577-586,共10页
The pretreatment for the removal of small molecules from poly(acrylic acid) sodium (PAAS) solution by continuous diafiltration was investigated using ultrafiltration membrane. The effects of PAAS concentration, pH, tr... The pretreatment for the removal of small molecules from poly(acrylic acid) sodium (PAAS) solution by continuous diafiltration was investigated using ultrafiltration membrane. The effects of PAAS concentration, pH, trans-membrane pressure and pretreatment time on the permeate concentration and permeate flux were studied. The results show that the necessary pretreatment time (NPT) increases with PAAS concentration, decreases with TMP. The change trend of permeate flux with time is affected by pH. The permeate fluxes rapidly decrease from the start, and then increase gradually to stable values at pH 5.0, pH 7.0 and pH 9.3. However, it decreases gradually with time till a state value at pH 3.0 (iso-electric point, IEP). The removal of small molecules is easy at pH greater than iso-electric point (IEP). The change of filtration potential with time indicates the similar trend to that of permeation concentration, but the former is more convenient for indication of NPT. 展开更多
关键词 PRETREATMENT DIAFILTRATION ultrafiltration poly(acrylic acid) sodium filtration potential
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Electrochemical study on adsorption behavior of surfactants at β-2CaO·SiO2/NaAlO2 interface 被引量:2
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作者 Hai-yan YU Bo WANG +2 位作者 Xiao-lin PAN Ting-ting DING Shi-wen BI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第8期2416-2421,共6页
β-2CaO'SiO2 was obtained with analytical grade reagents. Polyethylene glycol (PEG), sodium polyacrylate (PAAS) and their mixture were used to inhibit the decomposition of β-2CaO·SiO2 in sodium aluminate so... β-2CaO'SiO2 was obtained with analytical grade reagents. Polyethylene glycol (PEG), sodium polyacrylate (PAAS) and their mixture were used to inhibit the decomposition of β-2CaO·SiO2 in sodium aluminate solution. The potential of solid-liquid interface and the adsorption mechanism were studied by the methods of Zeta potential measurement and XPS. The results indicate that PEG and PAAS have synergistic effect on the inhibition of secondary reaction. The inhibitory effect is the best when the volume ratio of PAAS to PEG is 1:1 and the total concentration is 12.5 mg/L. PAAS adsorbs on the surface of β-2CaO-SiO2 by the formation of --COOCa coordinate bond, and the negative charge enters into Stem layer, which results in the decrease of particle potential and the obvious change of binding energy of Ca 2p, Si 2p and O Is. PEG only physically adsorbs on the surface ofβ-2CaO·SiO2, and had little effect on particle potential and binding energy of Ca 2p, Si 2p and O Is. 展开更多
关键词 sodium aluminate solution secondary reaction SURFACTANT (-potential interfacial adsorption electrochemicalperfon'nance
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Separation of aluminosilicates and diaspore from diasporic-bauxite by selective flocculation 被引量:2
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作者 黄传兵 张麟 +1 位作者 王毓华 兰叶 《Journal of Central South University of Technology》 EI 2008年第4期520-525,共6页
The flocculation tests of four pure minerals(diaspore,kaolinite,illite,pyrophyllite)and bauxite ore were investigated by the sedimentation.The dispersion behavior of the four pure minerals shows a very good consistenc... The flocculation tests of four pure minerals(diaspore,kaolinite,illite,pyrophyllite)and bauxite ore were investigated by the sedimentation.The dispersion behavior of the four pure minerals shows a very good consistency with the variation of zeta potential.The concentrate with the mass ratio of Al2O3 to SiO2(m(Al2O3)/m(SiO2))8.90 and the recovery of Al2O3 86.98%is obtained from bauxite ore(m(Al2O3)/m(SiO2)=5.68)in pH range of 9.5-10.0 by using sodium carbonate(5 kg/t)and sodium polyacrylate(7 g/t)as dispersant and flocculant respectively.Sodium carbonate acts as both pH modifier and favorable dispersant for aluminosilicates.The high performance of sodium polyacrylate on flocculation for diaspore is contributed to the carboxyl of sodium polyacrylate that interacts with active Al sites on diaspore by chemical absorption,and the hydrogen bond effects between hydroxyl group of macromolecule and surface Al—OH on diaspore to accelerate the sedimentation of diaspore. 展开更多
关键词 diasporic-bauxite sodium carbonate sodium polyacrylate ratio of Al2O3 to SiO2 selective flocculation FLOCCULANT dispersant
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Application of the High Molecular Water-keeping Compound Sodium Polyacrylate in Agriculture 被引量:1
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作者 Li Qingfeng,Liu Delin,Jin Longxin,and Wu Lijun Hunan Institute of Atomic Energy Application in Agriculture,Changsha 410125,China 《Hunan Agricultural Science & Technology Newsletter》 2001年第4期24-26,共3页
The properties of the high molecular water-absorbing compound sodium polyacrylate (SP) and its application in agriculture are reviewed;and its safety in application is also introduced.
关键词 sodium polyacrykte high molecular water-absorbing material agricultural application
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Purification,Characterization and in vitro Anthelmintic Activity of a Neutral Metalloprotease from Laccocephalum mylittae 被引量:4
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作者 周立华 许勤勤 +3 位作者 张一琼 周振兴 管文军 李永泉 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第1期122-128,共7页
A neutral metalloprotease was purified from the cultured mycelia of Laccocephalum mylittae,an effective medicinal fungus widely used in anthelmintic therapy.The protease was purified to homogeneity with 31.85-fold pur... A neutral metalloprotease was purified from the cultured mycelia of Laccocephalum mylittae,an effective medicinal fungus widely used in anthelmintic therapy.The protease was purified to homogeneity with 31.85-fold purification and a final yield of 21.76%.The subunit molecular weight of the protease is about 40000 estimated by sodium dodecyl sulfate polyacrylamide gel electrophoresis(SDS-PAGE).The optimum reaction pH and temperature are 7.5 and 50oC,respectively.The protease activity is largely enhanced by Ca2 +,but highly inhibited by tetrasodium ethylenediaminetetraacetate(EDTA),a metal-chelator,suggesting that the enzyme is a metalloprotease.The Michaelis-Menten constan Km and Vmax value for casein substrate are 6.09 mg·ml -1and 21.32μg·min -1·ml -1, respectively.In vitro anthelmintic tests of the protease exhibit distinct lethal effects on the third stage larvae(L3)of Ascaris suum.Scanning electron microscopy and SDS-PAGE analysis indicates that the proteolysis of larvae proteins caused by this protease may relate to the anthelmintic activity of L.mylittae. 展开更多
关键词 METALLOPROTEASE Laccocephalum mylittae PURIFICATION CHARACTERIZATION anthelmintic activity
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Quality Monitoring of Porous Zein Scaffolds: A Novel Biomaterial
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作者 Yue Zhang Wei-Ying Li +1 位作者 Run Lan Jin-Ye Wang 《Engineering》 SCIE EI 2017年第1期130-135,共6页
Our previous studies have shown that zein has good biocompatibility and good mechanical properties. The first product from a porous scaffold of zein, a resorbable bone substitute, has passed the biological evaluation ... Our previous studies have shown that zein has good biocompatibility and good mechanical properties. The first product from a porous scaffold of zein, a resorbable bone substitute, has passed the biological evaluation of medical devices (ISO 10993) by the China Food and Drug Administration. However, Class III medical devices need quality monitoring before being placed on the market, and such monitoring includes quality control of raw materials, choice of sterilization method, and evaluation of biocompatibility. In this paper, we investigated four sources of zein through amino acid analysis (AAA) and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) in order to monitor the composition and purity, and control the quality of raw materials. We studied the effect of three kinds of sterilization method on a porous zein scaffold by SDS-PAGE. We also compared the changes in SDS-PAGE patterns when irradiated with different doses of gamma radiation. We found that polymerization or breakage did not occur on peptide chains of zein during gamma-ray (y-ray) sterilization in the range of 20-30 kGy, which suggested that γ-ray sterilization is suitable for porous zein scaffolds, Regarding cell compatibility, we found a difference between using a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay and a cell-counting kit-8 (CCK-8) assay to assess cell proliferation on zein film, and concluded that the CCK-8 assay is more suitable, due to its low background optical density. 展开更多
关键词 Zein Amino acid analysis SDS-PAGE Gamma-ray sterilization MTF assay CCK-8 assay
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Accumulation of High Molecular Weight Glutenin Subunits in Superior and Inferior Grains of Winter Wheat
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作者 Hoang Kim Toan Yun BO +6 位作者 Qin Zhou Jian Cai Xiao Wang Zhongwei Tian Tingbo Dai Weixing Cao Dong Jiang 《Journal of Agricultural Science and Technology(B)》 2015年第7期451-458,共8页
The difference in accumulation of high molecular weight glutenin subunits (HMW-GS) in superior and inferior grains results in the non-uniformity of grain quality in winter wheat (Triticum aestivum L.). The HMW-GS ... The difference in accumulation of high molecular weight glutenin subunits (HMW-GS) in superior and inferior grains results in the non-uniformity of grain quality in winter wheat (Triticum aestivum L.). The HMW-GS accumulation and glutenin macropolymer (GMP) content were studied in superior and inferior grains during the grain filling period, using the sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). Compared to inferior grains, HMW-GS was formed earlier and total accumulation amount was higher in superior grains. The total HMW-GS content was higher in superior grain than that in inferior grain except at maturity. For individual HMW-GS types, the accumulation and content of subunit 7 were the highest, followed by subunit 12, while that of subunit 8 were the lowest, followed by subunit 2 in superior grain. In contrary, the accumulation and content of subunit 7 at maturity were significantly higher than subunit 8, but they were similar between subunit 2 and subunit 12 in inferior grain. Moreover, the accumulation of subunit 7 and 12 in superior grain were significantly higher than that in inferior grain. However, compared to the inferior grain, the GMP accumulation was higher, while content was lower in superior grain at maturity. 展开更多
关键词 Superior and inferior grains HMW-GS GMP winter wheat.
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Polyacrylic acid sodium salt film entrapped Ag-nanocubes as molecule traps for SERS detection 被引量:6
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作者 Zhulin Huang Guowen Meng +7 位作者 Qing Huang Bin Chen Fei Zhou Xiaoye Hu Yiwu Qian Haibin Tang Fangming Han Zhaoqin Chu 《Nano Research》 SCIE EI CAS CSCD 2014年第8期1177-1187,共11页
Surface-enhanced Raman spectroscopy (SERS) is a fast analytical technique for trace chemicals; however, it requires the active SERS-substrates to adsorb analytes, thus limiting target species to those with the desir... Surface-enhanced Raman spectroscopy (SERS) is a fast analytical technique for trace chemicals; however, it requires the active SERS-substrates to adsorb analytes, thus limiting target species to those with the desired affinity for substrates. Here we present networked polyacrylic acid sodium salt (PAAS) film entrapped Ag-nanocubes (denoted as Ag-nanocubes@PAAS) as an effective SERS-substrate for analytes with and without high affinity. Once the analyte aqueous solution is cast on the dry Ag-nanocubes@PAAS substrate, the bibulous PAAS becomes swollen forcing the Ag-nanocubes loose, while the analytes diffuse in the interstices among the Ag-nanocubes. When dried, the PAAS shrinks and pulls the Ag-nanocubes back to their previous aggregated state, while the PAAS network "detains" the analytes in the small gaps between the Ag-nanocubes for SERS detection. The strategy has been proven effective for not only single- analytes but also multi-analytes without strong affinity for Ag, showing its potential in SERS-based simultaneous multi-analyte detection of both adsorbable and non-adsorbable pollutants in the environment. 展开更多
关键词 SERS Ag-nanocube polyacrylic acid sodium salt trace detection
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A Comparative Study of the Cellular Microscopic Characteristics and Mechanisms of Maize Seedling Damage from Superabsorbent Polymers 被引量:7
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作者 CHEN Xian HUANG Lei +2 位作者 MAO Xiaoyun LIAO Zongwen Zhenli HE 《Pedosphere》 SCIE CAS CSCD 2017年第2期274-282,共9页
Superabsorbent polymers(SAPs) as soil moisture conditioners have been increasingly used in agriculture, but conflicting results were reported regarding the effects of SAPs on crop growth. In this study, both laborator... Superabsorbent polymers(SAPs) as soil moisture conditioners have been increasingly used in agriculture, but conflicting results were reported regarding the effects of SAPs on crop growth. In this study, both laboratory cultivation and analysis were conducted to investigate the effects of different SAPs on the growth and physiology of crops under water-saving agricultural practices. Maize(Zea mays L.) seedlings were cultivated using distilled water or three different SAP hydrogels, sodium polyacrylate(SP), potassium polyacrylate(PP), and sodium polyacrylate embedded with phosphate rock powder(SPP), as growth media. Growth characteristics of the model plant and damage were assessed using scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results showed that both the SP and PP treatments had pronounced negative effect on the hydrogels of growth of maize seedlings. The SPP treatment appeared to facilitate the stem-leaf growth and had no obvious adverse effect on root growth. All the three hydrogel treatments caused varying degrees of damage to the organizational structure and cellular morphology of the roots, with the SP and PP treatments causing the most severe damage; the membrane system of root cells was damaged by both SP and PP treatments. An excessive accumulation of sodium and reduction of calcium occurred in the roots may be responsible for the observed damage to the cell membrane system, which, in turn, may have promoted the wilting of the cells. 展开更多
关键词 damage mechanism nutrient concentration root tip cell SAP hydrogels soil moisture conditioners water-savingagriculture
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Genetic and antigenic characterization of recombinant nucleocapsid proteins derived from canine coronavirus and canine respiratory coronavirus in China 被引量:2
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作者 Shuai Lu Yingzhu Chen +3 位作者 Kun Qin Jianfang Zhou Yongliang Lou Wenjie Tan 《Science China(Life Sciences)》 SCIE CAS CSCD 2016年第6期615-621,共7页
To characterize the antigenicity of nucleocapsid proteins(NP) derived from canine coronavirus(CCo V) and canine respiratory coronavirus(CRCo V) in China, the N genes of CCo V(CCo V-BJ70) and CRCo V(CRCo V-BJ202) were ... To characterize the antigenicity of nucleocapsid proteins(NP) derived from canine coronavirus(CCo V) and canine respiratory coronavirus(CRCo V) in China, the N genes of CCo V(CCo V-BJ70) and CRCo V(CRCo V-BJ202) were cloned from swabs obtained from diseased pet dogs in Beijing and then sequenced. The recombinant NPs(r NPs) were expressed in Escherichia coli and purified by nickel-affinity column and size exclusion chromatography. Sequencing data indicated that the N genes of CCo V-BJ70 and CRCo V-BJ202 belonging to two distinctly different groups were relatively conserved within each subgroup. Sodium dodecyl sulfate polyacrylamide gel electrophoresis(SDS-PAGE) results showed that r NPs of CCo V and CRCo V were expressed efficiently and isolated with a final purity of over 95%. Western blot analysis revealed the r NP from CRCo V could cross-react with mice antisera against human coronavirus(HCo V-229 E, NL63, OC43, HKU1), while r NP of CCo V had cross-reactivity with only anti-sera against viruses belonging to the same group(HCo V-229 E and NL63). In summary, CCo V and CRCo V r NPs were successfully expressed in E. coli and showed antigenic cross-reactivity with antisera raised against human coronaviruses. These findings indicate that further serologic studies on coronavirus infections at the animal-human interface are needed. 展开更多
关键词 canine coronavirus canine respiratory coronavirus nucleocapsid protein expression cross-reactivity
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