反相悬浮聚合法合成超强吸水剂

以两性高分子作悬浮稳定剂，用反相悬浮聚合法合成了丙烯酸盐／丙烯酰胺／甲基丙烯酸羟乙酯三元共聚物型超强吸收剂。研究了交联剂，稳定剂，链转移剂，中和程度及单体组成等聚合条件对吸水剂吸液性能的影响，得到了吸蒸馏水1168mL.g^-1及吸0．9％NaCl溶液92mL.g^-1的超强吸水剂。     

聚丙烯酸吸水树脂的反相悬浮聚合研究

环己烷为连续相 ,水为分散相 ,采用反相悬浮聚合法合成了聚丙烯酸高吸水性树脂。研究了碱用量、引发剂用量、交联剂用量及温度等反应条件对树脂物理状态和吸水性能的影响。制得吸水树脂最高可吸水 85 0 m L g,吸 0 .9% Na Cl溶液 12 0m L g。     

反相悬浮法制备高耐盐性吸水树脂的研究

以环己烷为分散介质,吐温80为分散剂,过硫酸钾为引发剂,N,N-亚甲基双丙烯酰胺为交联剂,采用反相悬浮共聚合成AA/AM高耐盐性树脂,研究了单体、引发剂、交联剂、中和度、分散剂等对树脂吸液性能的影响,得到最佳工艺条件下产物在蒸馏水和生理盐水中的吸液率分别为1092g·g-1和171g·g-1,该产品具有良好的热稳定性和保水能力。     

反相悬浮法合成高耐盐性的超强吸水剂

以多元醇为交联剂、烷基磷酸钠 -司盘 (NP -SP)为复合悬浮稳定剂、丙烯酸 (AA)为单体、过硫酸铵 (APS)为引发剂、环己烷为分散介质 ,采用反相悬浮法合成耐盐性聚丙烯酸钠超强吸水剂。研究了交联剂类型和用量 ,悬浮稳定剂类型、用量和质量比 ,引发剂浓度 ,单体中和度(丙烯酸钠占单体总量的摩尔分数 ) ,聚合温度等对产品物理性状、耐盐性及体系稳定性的影响。当 ρ(多元醇 ) =0 5 3g/L、ρ(NP -SP) =0 0 0 8～ 0 0 1g/mL、m(SP)∶m(NP) =(2 3～ 4 0 )∶1 0、c(APS) =40 5mmol/L、单体中和度x(丙烯酸钠 ) =79 2 %、聚合温度 70～ 76℃时 ,体系稳定 ,产品成球性好 ,吸盐水 (生理盐水 )率 199mL/ g ,吸水 (蒸馏水 )率 86 4mL/ g ,耐盐性高于其他交联剂交联型产品。     

反相悬浮聚合法制备超强吸水树脂

以环己烷作为分散介质,以司班80作为分散荆,N,N-亚甲基双丙烯酰胺和多元醇作为交联剂,过硫酸铵作为引发剂采用反相悬浮聚合法分两阶段合成了核壳型超强吸水树脂,得到的产品呈颗粒状,吸去离子水倍率为998g／g,吸生理盐水的吸液倍率达到147g／g。探讨了分散荆、交联剂、反应温度、丙烯酸中和度及核壳比对超强吸水树脂物理状态及吸液能力的影响。     

反相悬浮聚合法合成高吸水性树脂的研究

以环己烷为分散介质,聚乙烯醇为主分散剂,十二烷基磺酸钠为助分解剂,Ｎ,Ｎ－亚甲基双丙烯酰胺为交联剂,过硫酸钾为引发剂,采用反相悬浮聚合法合成了丙烯酸－丙烯酸－丙烯酰胺三元共聚交联型高吸水性树脂,产物呈软珠粒状。吸自来水达６５０倍,０．９％的生理盐水达７５倍。     

反相悬浮法制取耐压型聚丙烯酰胺吸水性树脂

以K2S2O8为引发剂,N,N′-亚甲基双丙烯酰胺为交联剂,用反相悬浮聚合法合成了交联聚丙烯酰胺,研究了引发剂、交联剂、分散剂及水解条件对其吸水性能的影响,得到了粒径为290μm,吸去离子水倍数和吸油井内矿化水倍数分别为220与180,压力为1.0×107Pa条件下,保水率达50%的球状粒子.     

三元共聚反相悬浮聚合法合成高吸水性树脂的研究

以丙烯酸、丙烯酰胺、2－丙烯酰胺－2－甲基丙磺酸为原料，过硫酸钾为引发剂，N，N－亚甲基双丙烯酰胺为交联剂，环已烷为连续相，水为分散相，以Span-60为悬浮分散剂，用反相悬浮聚合法合成了一系列高吸水性树脂，考察了合成条件对树脂吸水率的影响。     

聚丙烯酸类超强吸水剂的反相悬浮法制备

以 6号溶剂油为分散介质 ,Span85 - OP7为分散剂 ,N,N′-亚甲基双丙烯酰胺为交联剂 ,过硫酸钾 -亚硫酸钠为氧化还原引发剂 ,采用反相悬浮聚合法合成丙烯酸 -丙烯酸钠交联共聚超强吸水剂。探讨了该合成工艺的最佳反应条件。产物呈均匀微粒状 ,易干燥 ,吸水率达 1 2 60 g/g,对0 .9%盐水溶液的吸液率为 1 1 0 g/g     

反相悬浮聚合法合成CMC-g-AA／SiO2高吸水性复合材料

本文以羧甲基纤维素（CMC）和丙烯酸接枝共聚物为有机相,通过正硅酸乙酯（TEOS）引入SiO2无机相,采用反相悬浮聚合法制各了CMC-g-AA／SiO2高吸水性复合材科。讨论了各影响因素对材料性能的影响,并通过傅立叶红外（FTIR）和进行表征。结果表明,最优化条件下制得材抖的最佳吸水倍率为705g／g、最佳吸盐水倍率为86g／g。     

Synthesis and properties of acrylic‐based superabsorbent

Acrylic‐based superabsorbent polymers with partial‐neutralized acrylic acid were synthesized by inverse suspension polymerization. The effects of reaction parameters, including the concentration of crosslinking agent and initiator, the neutralization degree of monomer, the monomer concentration, and phase ratio of a system, on the water absorption have been investigated. Furthermore, to improve the properties of salt‐resistance and antielectrolyte for the polymer, acrylamide monomer containing nonionic and hydrophilic groups was introduced into the system, which can suppress the salt effect and homoion effect. The water absorption Q^5/3 is proportional to the reciprocal of ionic strength, 1/S, which follows Flory's elasticity gel theory. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 619–624, 2004     

水溶液共聚法合成耐盐性高吸水性树脂

以丙烯酰胺、丙烯酸、甲基丙烯酸羟乙酯为单体,采用水溶液共聚法合成交联型Ｐ三元共聚高吸水性树脂。研究了影响共聚物性能的主要因素：单体组成,交联剂用量,引发剂用量等的影响。并对其保水性,吸水、吸盐水速率进行了测定。该树脂吸水速度快,吸水率达１０００ｇ．ｇ＾－１,吸盐水８８ｇ．ｇ＾－１。     

高吸油性树脂的合成

以丙烯酸烷基酯为单体,过氧化苯甲酰（BPO）为引发剂,二丙烯酸乙二醇酯为交联剂,采用悬浮聚合法合成聚丙烯酸酯类吸油树脂。本文讨论了单体结构、引发剂用量、交联剂用量对吸油树脂性能的影响。     

高岭土复合耐盐型高吸水性树脂的合成

以丙烯酸(AA)、丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)为原料,通过反相悬浮法制得具有阳离子、阴离子、非离子单体和高岭土复合的耐盐型高吸水树脂。选用环己烷作为油相,过硫酸钾为引发剂,N,N-亚甲基双丙烯酰胺为交联剂,Span 60为悬浮剂,研究了丙烯酸中和度、高岭土用量、DMC用量、引发剂用量、交联剂用量、反应温度对树脂吸液性能的影响。并用红外光谱和扫描电镜对其结构进行了表征。在最佳工艺条件下,耐盐型吸水树脂对蒸馏水和生理盐水的吸液率分别为1 827 g/g和146 g/g。     

聚丙烯酸盐高吸水树脂的合成

以Span80为分散剂,过硫酸钾为引发剂,N,N′－亚甲基双丙烯酰胺为交联剂,采用反相悬浮聚合法制备聚丙烯酸盐高吸水树脂,研究了丙烯酸中和度,引发剂,交联剂以及分散剂用量对聚合物吸水率的影响。     

高保水性淀粉接枝聚丙烯酸钠高吸水性树脂合成研究

以过硫酸铵为引发剂,N,N'-亚甲基双丙烯酰胺为交联剂,聚合与干燥一步合成淀粉接枝丙烯酸钠超强吸水剂,其生理盐水加压保水率达75%～90%。     

Superabsorbent polymeric materials X: Effect of degree of neutralization on swelling behavior of crosslinked poly(sodium acrylate) in aqueous salt solutions

A series of xerogels based on different degrees of neutralizations (DN) of acrylic acid (AA) and N,N-methylene-bis-acrylamide (NMBA) were prepared by inverse suspension polymerization. The influence of the DN values of AA on water absorbency and swelling behavior for these highly absorbent polymers in deionized water and various saline solutions were investigated. Results indicate that the equilibrium-water absorbency (Q_eq) increases with an increase in the DN of AA until the DN value reaches 95% and then decreases at 100% of the DN value. However, the initial absorption rate for these gels decreases with an increase in the DN value of AA in both deionized water and 0.9 wt% NaCl solution. The adsorption of copper ions by these gels was also investigated.     

Equilibrium Swelling Studies of Chemically Cross-Linked Highly Swollen Acrylamide-Sodium Acrylate Hydrogels in Various Water-Solvent Mixtures

Swelling behavior of acrylamide (AAm)/sodium acrylate (SA) hydrogels was investigated in water-solvent (methanol, ethanol, t-butanol and acetone) mixtures of various compositions. AAm/SA hydrogels were prepared by free radical solution polymerization in aqueous solutions of AAm with SA as comonomers and a multifunctional cross-linker such as trimethylolpropane triacrylate (TMPTA). Swelling experiments were performed in water and water-organic solvent mixtures of various compositions at 25°C, gravimetrically. The value of S_eq% of AAm/SA hydrogels are 64–152% for 60% of metanol, 84–102% for 60% of ethanol, 127–176% for 60% of t-butanol, 131–585% for 60% of acetone, while the value of S_eq% of AAm/SA hydrogels are 780–4510% for water and water-solvent mixtures. Some swelling kinetic parameters were found. Diffusion behavior of water and water-solvent mixtures was investigated. Diffusion of water and water-solvent mixtures into the hydrogels was found to be non-Fickian in character.     

Synthesis and characterization of superabsorbent hydrogels composites based on polysuccinimide

A kind of novel superabsorbent hydrogel with high swelling ratio property that could be used for the development of water absorbing resin, soil water retention agent, and chemical sand‐fixing material was synthesized in this study. The hydrogels were prepared by the crosslinking reaction of polysuccinimide (PSI). The relationships between swelling ratio and volume of solvent as well as the concentration of crosslinking agent were investigated in detail. Several composites, such as starch, carrageenan, and polyacrylamide, were added into hydrogels to enhance the swelling ratio. It was found that the swelling ratio was significantly increased, which the maximum water absorbency was enhanced 2.46 times when the composite polyacrylamide (PAM) was added compared to the control. The effects of ionic strength and sensitivity of pH on hydrogels were also studied. The modified hydrogels products with swelling ratio less sensitivity to the salinity as well as relative high swelling ration in salinity system were also obtained by adding PAM. Through the Fourier transform infrared spectroscopy (FTIR) characterizations, the crosslinking reaction mechanism and the structure of composite were proposed. In addition, the transmission electron microscopy (TEM) examinations showed that some composite materials elevated the physical crosslinked and connected channels density substantially. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 550–557, 2006     

高吸水性树脂的合成研究

采用反相悬浮聚合法 ,运用两种不同的交联剂分阶段聚合 ,合成核壳型高吸水树脂。研究了反应温度、丙烯酸中和度、分散剂、交联剂及核壳比对吸水剂吸水性能的影响