丙烯酸-丙烯酰胺共聚物吸水树脂的制备

采用溶液聚合法,以丙烯酸(AA)和丙烯酰胺(AM)为单体,N,N’-亚甲双丙烯酰胺(NMBA)为交联剂,过硫酸铵为引发剂,制备了丙烯酸-丙烯酰胺共聚物吸水树脂,探讨了单体配比(mAA/mAM)、交联剂和引发剂用量对树脂吸水率的影响。结果表明:在65℃时,丙烯酸-丙烯酰胺共聚物吸水树脂的最佳制备条件为:丙烯酸和丙烯酰胺质量比为4:1,交联剂和引发剂用量分别为聚合单体(丙烯酸和丙烯酰胺)总质量的0.02%和0.4%。     

水溶液聚合法合成高吸水性树脂的研究

以N,N-亚甲基双丙烯酰胺为交联剂,过硫酸钾-亚硫酸氢钠为引发剂,以丙烯酸和丙烯酰胺为单体,采用水溶液聚合法合成了丙烯酸-丙烯酰胺共聚的吸水树脂,并探讨了单体浓度、单体质量比、丙烯酸中和度、交联剂用量、引发剂用量对吸水树脂吸水量的影响,最大吸水率为799.3 g/g。     

CMC和AA／AM三元共聚高吸水树脂的研究

以N, N-亚甲基双丙烯酰胺为交联剂,过硫酸铵和亚硫酸氢钠为引发剂,羧甲基纤维素(CMC)-丙烯酰胺(AM)-丙烯酸(AA)为原料进行共聚合成了高吸水树脂,研究了单体、中和度、交联剂等因素对产品吸水性能的影响.     

二元共聚高吸水性树脂的合成与溶涨性能

以N ,N′-亚甲基双丙烯酰胺为交联剂 ,过硫酸钾为引发剂 ,采用溶液聚合法合成了丙烯酸 -丙烯酰胺二元共聚高吸水性树脂 .研究了单体组成、单体浓度、引发剂用量、交联剂用量、反应温度等因素对产物性能的影响 .并对反应动力学和共聚物的溶涨动力学进行了探讨     

微波法制备高吸水性树脂的溶胀性能研究

以2-丙烯酰胺-2-甲基丙磺酸(AMPS)和丙烯酸(AA)为单体,N,N′-亚甲基双丙烯酰胺为交联剂,在不加引发剂的情况下采用微波聚合法合成了丙烯酸-2-丙烯酰胺-2-甲基丙磺酸二元共聚高吸水性树脂。研究了交联剂用量、中和度等因素对产物性能的影响,并对溶胀动力学进行了初步探讨。     

淀粉接枝丙烯酸／丙烯酰胺影响因素的研究

探索了以过硫酸钾为引发剂,以N,N,-亚甲基双丙烯酰胺为交联剂,将淀粉与丙烯酰胺、丙烯酸在水溶液中聚合制备高吸水性树脂。结果表明：当m（丙烯酰胺）：m（丙烯酸）为1：24,单体总用贵为12g,反应温度30％,反应时间2h,丙烯酸中和度94％,引发剂用量0.02g,交联剂用量为0.0015g时,可以合成具有较好的吸水性的高吸水性树脂,在蒸馏水中吸水倍率可达699.99g／g。     

微波法合成凹凸棒复合丙烯酸-丙烯酰胺高吸水性树脂的研究

以N, N′-亚甲基双丙烯酰胺为交联剂,过硫酸钾和亚硫酸氢钠为引发剂,在微波辐照下合成了凹凸棒复合丙烯酸-丙烯酰胺高吸水性树脂。研究了丙烯酸和丙烯酰胺的质量比、凹凸棒的用量、微波反应功率和反应时间等因素对高吸水树脂吸液性能的影响,并用IR谱对最佳产物的结构进行了表征。实验结果表明,最佳的反应条件为：丙烯酸、丙烯酰胺和凹凸棒的质量比为15：3.5：1,引发剂用量占单体质量0.6 %,交联剂N, N′-亚甲基双丙烯酰胺的用量为单体质量的0.05 %,反应器功率为600 W,反应时间40 s。     

淀粉接枝共聚合成吸水树脂工艺研究

以淀粉为原料,丙烯酸和丙烯酰胺为共聚单体,过硫酸铵为引发剂,N,N‘-亚甲基双丙烯酰胺为交联剂,采用接枝共聚法制备吸水树脂。研究了引发剂用量、交联剂量、单体与淀粉质量比以及丙烯酸和丙烯酰胺质量比对产品的吸水率的影响。实验结果表明：当引发剂占干物料质量的0．6％,交联剂质量占单体质量的0．8‰,单体与淀粉质量比为4,丙烯酸与丙烯酰胺质量比为1．33,产品的吸水率可超过550。     

以马铃薯渣为原料合成高吸水树脂及其性能研究

以马铃薯渣为原料、水作溶剂制备了羧甲基马铃薯渣,以N,N′-亚甲基双丙烯酰胺为交联剂,以过硫酸钾和亚硫酸氢钠氧化还原体系作为引发剂,与丙烯酸(盐)在较低温下接枝聚合应合成了高吸水树脂。探究了单体用量、丙烯酸中和度、交联剂用量、氧化还原引发剂用量、总水量对高吸水树脂吸水量的影响;本文还对树脂的吸液能力进行了测定。     

丙烯酸钠-丙烯酰胺高吸水树脂的合成与性能

以过硫酸钾为引发剂、N,N-亚甲基双丙烯酰胺(NNMBA)为交联剂,采用水溶液聚合法制备聚丙烯酸钠-丙烯酰胺高吸水性树脂,研究了丙烯酸与丙烯酰胺比例、单体浓度、引发剂用量、交联剂用量以及聚合温度对树脂吸水性能的影响。制备的高吸水性树脂吸蒸馏水为593g·g-1,吸自来水为260g·g-1,吸0.9%Na Cl溶液为66.7g·g-1。     

聚丙烯酸树脂吸液性能的条件探讨

本实验采用溶液聚合法,以丙烯酸（AA）和丙烯酰胺（AM）为单体,氢氧化铝作为交联剂,过硫酸钾为引发剂合成高吸水性树脂,并探讨了单体丙烯酰胺与丙烯酸的配比率、丙烯酸的中和度、交联剂用量、聚合温度、引发剂对高吸水树脂吸液性能的影响.结果显示当丙烯酰胺和丙烯酸单体的配比率0.3～0.4,丙烯酸的中和度60 ％～70％,交联剂的用量约占单体0.03 ％～0.05％,引发剂用量约占单体的0.2％加.3％,聚合温度为55～60℃时,合成树脂的吸水倍率达最大,为995.35 g/g.     

壳聚糖接枝丙烯酸-丙烯酰胺高吸水树脂的制备

以壳聚糖(CTS)、丙烯酸(AA)、丙烯酰胺(AM)为原料,过硫酸钾(KPS)为引发剂,N,N'-亚甲基双丙烯酰胺(NMBA)为交联剂,通过溶液聚合后再用乙醇-氢氧化钠溶液浸泡制备了壳聚糖-g-丙烯酸-丙烯酰胺高吸水树脂(CPAAM)。考察了制备过程中各影响因素对CPAAM吸水性能的影响,获得优化制备条件为:单体总浓度mM=8.6%(相对于反应体系总质量,m/m,下同),壳聚糖与总单体比m(M):m(CTS)=6:1(M为AA和AM),引发剂和交联剂浓度分别为mI=2.5%和mC=0.1%(相对于单体AA及AM总单体质量),反应温度60℃,反应时间5h。此条件下合成的CPAAM在蒸馏水、0.9%氯化钠溶液中最大吸液倍率分别为1315g/g、66g/g。     

淀粉基高吸水性树脂的合成与性能研究

以马铃薯淀粉和丙烯酸(AA)为原料,过硫酸钾(K2S2O8)为引发剂,三氯化铝(AlCl3)为交联剂,采用以水为溶剂的溶液聚合法制备淀粉基高吸水性树脂(SAP)。确定合理的反应时间,评价树脂的吸水速率、反复吸水性及保水性能。结果表明,在ω(K2S2O8)=0.15%,ω(AlCl3)=0.10%,m(AA)∶m(starch)=6∶1,丙烯酸中和度70%,60℃的条件下,反应80 min制备的树脂吸蒸馏水率为1 235 g/g,吸质量分数为0.9%NaCl溶液率101 g/g,且吸水速率较快,SAP的重复吸水性能和保水性能较好。FTIR分析证实树脂为淀粉与丙烯酸(钠)的接枝共聚物,SAP的XRD衍射峰呈弥散衍射特征,TG和DTA分析说明SAP的热稳定性良好。     

魔芋粉-丙烯酸-丙烯酰胺接枝共聚合成高吸水树脂

以魔芋粉，丙烯酸和丙烯酰胺等为原料，经接枝聚合合成了魔芋粉－丙烯酸－丙烯酰胺类超强吸水性树脂。讨论了引发剂，交联剂，丙烯酸，丙烯酰胺等用量以及反应时间和反应温度等因素对树脂吸水性能的影响。结果表明: 在魔芋粉与单体质量比为1:4，引发剂用量为0.35%（占单体的质量）,丙烯酸/丙烯酰胺（质量）为1:1，丙烯酸中和度为80% ，反应温度为55～65℃，交联剂用量为0.75%（占单体的质量）的条件下，制得的SAP吸去离子水可达720g/g，吸0.9%的NaCl溶液为110g/g。     

Preparation of superabsorbent based on the graft copolymerization of acrylic acid and acrylamide onto konjac glucomannan and its application in the water retention in soils

A new konjac glucomannan (KGM)-based superabsorbent polymer, KGM-g-poly(acrylic acid-co-acrylamide), was prepared by the free radical grafting solution polymerization of acrylic acid (AA) and acrylamide (AM) monomers onto KGM in the presence of N,N′-methylenebisacrylamide as a crosslinker with potassium persulfate as an initiator. The effects of reaction parameters, including the amount of crosslinking agent and initiator, the weight ratio of both (AA + AM) to KGM and AM to (AA + AM), neutralization degree of AA, bath temperature, and reaction time, on the water absorbency of the superabsorbent were investigated. The Fourier transform infrared spectroscopy was used to characterize the structures of the copolymer. The maximum water absorbency of the optimized product was 650 g/g for distilled water and 70 g/g for a 0.9 wt % aqueous NaCl solution. Furthermore, the water retention of the copolymer in soils was studied. The effect of the copolymers on the aggregate distribution of soils was also evaluated. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Synthesis and properties of carboxymethyl cellulose‐graft‐poly(acrylic acid‐co‐acrylamide) as a novel cellulose‐based superabsorbent

A new cellulose‐based superabsorbent polymer, carboxymethyl cellulose‐graft‐poly(acrylic acid‐co‐acrylamide), was prepared by the free‐radical grafting solution polymerization of acrylic acid (AA) and acrylamide (AM) monomers onto carboxymethyl cellulose (CMC) in the presence of N,N′‐methylenebisacrylamide as a crosslinker with a redox couple of potassium persulfate and sodium metabisulfite as an initiator. The influences of reaction variables such as the initiator content, crosslinker content, bath temperature, molar ratio of AA to AM, and weight ratio of the monomers to CMC on the water absorbency of the carboxymethylcellulose‐graft‐poly(acrylic acid‐co‐acrylamide) copolymer were investigated. The copolymer's structures were characterized with Fourier transform infrared spectroscopy. The optimum reaction conditions were obtained as follows: the bath temperature was 50°C; the molar ratio of AA to AM was 3 : 1; the mass ratio of the monomers to CMC was 4 : 1; and the weight percentages of the crosslinker and initiator with respect to the monomers were 0.75 and 1%, respectively. The maximum water absorbency of the optimized product was 920 g/g for distilled water and 85 g/g for a 0.9 wt % aqueous NaCl solution. In addition, the superabsorbent possessed good water retention and salt resistance. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1382–1388, 2007     

Studies on poly(acrylic acid)/attapulgite superabsorbent composite. I. Synthesis and characterization

A novel poly(acrylic acid)/attapulgite superabsorbent composite was synthesized by graft copolymerization reaction of acrylic acid (AA) on attapulgite micropowder using N,N′‐methylenebisacrylamide (MBA) as a crosslinker and ammonium persulfate (APS) as an initiator in aqueous solution. The effects on water absorbency of such factors as reaction temperature, initial monomer concentration, degree of neutralization of AA, amount of crosslinker, initiator, and attapulgite were investigated. These crosslinked superabsorbent composites were characterized by thermogravimetetric analysis and scanning electron microscopy. The graft copolymerization reaction of AA on attapulgite micropowder was characterized by FTIR. The water absorbencies for these superabsorbent composites in water and saline solutions were investigated and water‐retention tests were carried out. Results obtained from this study show that the water absorbency of the superabsorbent composite synthesized under optimal synthesis conditions with an attapulgite content of 10% exhibited an absorption of 1017 g H₂O/g sample and 77 g H₂O/g sample in distilled water and in 0.9 wt % NaCl solution, respectively. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1596–1603, 2004     

真空制备木薯淀粉超吸水材料

采用真空技术成功制备了一种木薯淀粉（CS）-g-丙烯酸（AA）超吸水材料。在AA与cS质量比2．5：l,过硫酸钾0．07g,30％wt氢氧化钠水溶液中和度（摩尔比）20％,N,N’-弧甲基双丙烯酰胺0．14％（占AA重）条件下,65℃真空恒温反应3h,干燥后得超吸水材料（cs．SAP）。一定温度湿度条件下,不同形状CS—SAP吸液能力及保水性能有一定差别,保留4％凝胶残重的材料保水时间最长可达28d：材料吸去离予水倍率高达1316．8（g／g）、自来水673．1（g／g）、0．9％NaCI水溶液54．8（g／g）、人工尿液63．0（g／g）。接枝反应及材料吸水结构经FTIR．SEM,PM表征。     

Synthesis and characterization of super‐absorbent hydrogels based on hemicellulose

A kind of novel hemicellulose‐based hydrogel with excellent water absorbency was synthesized by the graft copolymerization of acrylic acid (AA), acrylic amide (AM) with hemicellulose. The various factors that influenced the water absorbency of the modified hemicellulose were studied, including AA content, hemicellulose content, neutralization degree of AA, and weight ratio (to monomer) of cross‐linker and initiator. The optimal conditions were found as follows: m(AA) : m(AM) : m(hemicellulose) = 15 : 3.5 : 1, the neutralization degree of AA was 75%, and weight ratio (to monomers) of the cross‐linker and the initiator was 0.03% and 1.0%, respectively. The maximum absorbencies toward distilled water and 0.9 wt % NaCl solution were 1128 g/g and 132 g/g, respectively. The characteristics of the hydrogels were also investigated by Fourier Transform InfraRed (FT‐IR), scanning electron microscope (SEM), and atomic force microscope (AFM). The results indicated that the undulant surface and broad network structure offer the hydrogels excellent water absorbency. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42441.