反相悬浮聚合丙烯酸钠树脂合成方法的研究

用反相悬浮聚合的方法合成了聚丙烯酸钠吸水树脂,通过加入十二烷基磷酸酯作保护剂,使树脂颗粒的烘干和粉碎更容易,并选择了最佳分散介质和油水比。     

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。     

丙烯酸钠的聚合及吸水性能研究

以正己烷为连续相,司班80为分散剂,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高吸水性聚丙烯酸钠树脂。通过调整分散剂、引发剂、交联剂的用量,制备了几种高吸水性的树脂。在制得的高吸水性聚丙烯酸钠树脂中,性能最好的树脂吸去离子水为550mL／g,吸自来水为170mL／g,吸0．9％NaCl溶液60mL／g。     

静态反相悬浮聚合法合成聚丙烯酸钠

以过氧化氢为引发剂,以食用植物油如菜子油、花生油、茶油、葵花油、大豆油或者玉米油为分散相,采用静态反相悬浮聚合工艺合成聚丙烯酸钠,研究了引发剂用量、分散相以及反应温度对聚丙烯酸钠分子量的影响。结果表明,随过氧化氢浓度增大、丙烯酸钠单体浓度降低、聚丙烯酸钠的分子量降低;玉米油为分散相时聚丙烯酸钠的分子量最大;随反应温度升高,聚丙烯酸钠的分子量增大;但反应温度超过60℃时,聚丙烯酸钠的分子量随反应温度升高而降低。     

丙烯酸-丙烯酸钠自交联共聚合成高吸水性树脂的研究

采用反相悬浮法合成自交联丙烯酸－丙烯酸钠高吸水性树脂。研究了反应单体浓度、丙烯酸中和度、引发剂浓度及反应温度对共聚产物吸水性能的影响。     

反相悬浮共聚法合成耐盐快吸水性树脂

以AA(丙烯酸)、AMPS(2-丙烯酰胺-2-甲基丙烷磺酸)为单体,APS(过硫酸铵)为引发剂,MBAM(N,N-亚甲基双丙烯酰胺)为交联剂,十八醇磷酸单酯为分散稳定剂,环己烷为连续相,采用反相悬浮法合成吸盐水率高、吸水速率快的共聚型吸水树脂.研究了单体组成、交联剂浓度、AA中和度（Dn）、引发剂浓度、共聚温度(T)、油水相体积比对树脂吸盐水率和吸水率、吸水速率及物理性状的影响.当w(AMPS)=40%、c(MBAM)=1.62mmol• L^-1、Dn=75％、c(APS)=24.70mmol•L^-1、T=65℃、V(油)∶V(水)=1.5∶1.0时,共聚物的吸盐水率和吸水率分别为：A_生理盐水=264ml• g^-1,A_蒸馏水=1200ml•g^-1,15min可吸水饱和.通过热分析发现,提高共聚物的交联密度利于改进共聚物的保水性.     

悬浮聚合固体丙烯酸树脂的研制

介绍了悬浮聚合法制备固体丙烯酸树脂的工艺及其应用。     

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。     

反相悬浮聚合法淀粉接枝聚丙烯酸钠的研究

采用反相悬浮聚合法淀粉接枝聚丙烯酸钠合成高吸水性树脂。研究了淀粉种类、淀粉形态、不同的引发剂、预聚反应时间、引发剂浓度和中和度等对接枝共聚反应和产物吸水性能的影响。     

Inverse suspension polymerization of sodium acrylate: Synthesis and characterization

Crosslinked Poly(acrylic acid) was synthesized by inverse suspension polymerization. This process was investigated to determine the influence of different parameters like temperature, stirring speed, solution pH, and crosslinker concentration and to obtain the best control of the kinetics. An aqueous phase containing partially neutralized acrylic acid, crosslinking agent, and initiator agent was dispersed in an organic phase and stabilized by a surfactant. The inverse suspension was carried out in heptane as the organic phase with a different ratio of neutralization of the monomer, different crosslinker concentrations, and several stirring speeds. The polymerization was initiated by potassium persulfate (K₂S₂O₈) with N‐N′‐methylenebisacrylamide (MBA_C) as the crosslinker and sorbitan monooleate as the surfactant. The influence of several parameters on the bead size and the swelling capacity was investigated. Particle diameters ranged from 10 to 130 μm. The kinetic results obtained by differential scanning calorimetry showed that conversion and polymerization rates are a function of the solution pH, and they fell when the concentration of the crosslinking agent was higher than 7.5% in the mass of MBA_C. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2621–2630, 2000     

偏氯乙烯-丙烯酸甲酯悬浮共聚树脂的研制

采用悬浮共聚的方法研制了偏氯乙烯/丙烯酸甲酯（VDC/MA）共聚树脂。考察了共聚配方、分散剂种类及用量、搅拌速度及聚合温度对VDC/MA共聚树脂的影响。结果表明,当VDC/MA=（92-96）/（8-4）、采用分散剂B（用量0.13%)、搅拌速度300-400r/min,并根据聚合温度调节分子量大小,制得的VDC/MA共聚树脂其膜光泽好、透时度高,热稳定性好。     

丙烯酸/丙烯酸甲酯共聚物聚合工艺研究及其表征

以丙烯酸(AA)、丙烯酸甲酯(MA)为共聚单体,以过硫酸铵和亚硫酸氢钠为氧化还原体系引发剂,异丙醇为链转移剂,以水为溶剂,采用溶液聚合方法,合成P(AA-MA)共聚物,利用红外光谱对合成的共聚物结构和组成进行表征,研究了各因素对共聚物的特性粘数的影响程度,确定了最佳聚合条件为:单体比例为8∶1,加料时间0.5 h,聚合温度80℃,聚合时间2.5 h,过硫酸铵用量6%,亚硫酸氢钠用量2%,异丙醇100%(以单体质量计)。     

反相悬浮聚合法制备水溶性固体聚丙烯酸

以环己烷为连续相,失水山梨醇单油酸酯(Span-80)为分散剂,K2S2O8为引发剂,采用反相悬浮聚合法合成了水溶性良好的固体聚丙烯酸(PAA),详细探讨了搅拌速度、分散剂用量、单体浓度、反应温度及反应时间等对聚合产物颗粒特性的影响。结果表明,较优的工艺条件是:搅拌速度500r/min、分散剂质量分数4%~8%(相对于单体质量)、单体质量分数50%、反应温度70℃、反应时间3.0h。     

Influence of reaction parameters on water absorption of neutralized poly(acrylic acid‐co‐acrylamide) synthesized by inverse suspension polymerization

Highly water‐absorbing polymers of neutralized poly(acrylic acid‐co‐acrylamide) were synthesized in an effort to investigate the influences of reaction parameters on water absorption. In addition, the extent of water absorption and the absorption rate were studied to determine their relationship with the reaction parameters. This article explains the synthesis technique, characterization of the water‐absorbing copolymers, and their properties. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 1349–1366, 1999     

Inverse suspension polymerization of sodium acrylate

A superwater-absorbent sodium polyacrylate was synthesized by inverse suspension polymerization, using Span60 as the dispersant, cyclohexane as the organic phase, N,N′-methylene bisacrylamide as the crosslinking agent, and potassium persulfate as the initiator. The effect of reaction conditions such as reaction time, crosslinking agent, and dispersant on deionized-water and saline solution absorbability, average particle size, and distribution of the sol–gel of the resin is discussed. The deionized-water and saline solution absorbabilities of sodium polyacrylate prepared at proper conditions were 300–1200 and 50–120, respectively; the number-average particle size was 10–50 μm and the gel portion was 20–85% by weight. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 789-794, 1997     

丙烯酸类共聚破乳剂的研究

合成了丙烯酸类共聚破乳剂，研究了温度、溶剂用量、时间和单体配比、引发剂用量、pH调节剂用量、有无阻聚剂等因素对反应的影响。最佳手件下合成的产品加药量50mg／L，在80℃，8h内，脱水原油含水7．01％。     

Graft copolymerization of acrylic acid on cellulose: Reaction kinetics of copolymerization

Acrylic acid (AA) was grafted to cellulose by using ceric ammonium nitrate (CAN) initiator in aqueous nitric acid solution at 30, 50, 70, and 90°C during reaction periods of 30 to 180 minutes. About 45% of the AA was polymerized at 90°C after 180 minutes. The grafted polymer and homopolymer were isolated by acetone from the reaction mixture, dried, and subjected to Soxhlet extraction with dioxane to separate the homopolymer, poly(acrylic acid), from the graft copolymer. The water absorption capacities and grafting values of grafted cellulose were also determined. The maximum grafting yield was obtained at 30°C. It was also observed that polyacrylic acid-grafted cellulose produced at 30°C had the highest water retention capacity. The time dependence of AA conversion allowed calculation of first-order reaction rate constants. These rate constants were then used to determine apparent activation energies. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 929–934, 1997     

正交试验优选机械活化玉米淀粉-丙烯酰胺-丙烯酸三元接枝共聚的工艺条件

以机械活化预处理后的玉米淀粉为主要原料,丙烯酰胺(AM)、丙烯酸(AA)为单体,采用反相乳液法合成了机械活化淀粉三元接枝共聚物;对机械括化玉米淀粉与AM/AA在反相乳液中接枝共聚反应的5个影响因素:单体配比、反应温度、中和度、引发剂浓度、油水体积比进行理论研究.以接枝率为考察对象,得到最佳反应条件为AM/AA质量比0.67、反应温度55℃、中和度85%、引发剂浓度7.30mmol/L、油水体积比1.2:1,在此实验条件下,单体转化率97.50%,接枝率58.95%,和接枝效率69.57%.对比坂淀粉在类似的条件下,单体转化率为90.70%,接枝率和接枝效率分别为53.55%和64.84%.机械活化显著的提高了玉米淀粉在反相乳液中的接枝共聚反应活性.     

氧化还原引发下的淀粉、丙烯酸反相乳液聚合

以环己烷为连续相,Span20为乳化剂,采用氧化还原引发体系,通过反相乳液聚合技术,合成淀粉、丙烯酸接枝共聚物。并用红外光谱对共聚物进行了表征。研究结果表明:采用氧化还原引发剂可使聚合反应低温快速进行,在过硫酸钾为3.1mmol/L,亚硫酸氢钠为3.1mmol/L,单体丙烯酸浓度为2.6mol/L,反应温度为30℃,反应时间为3h,乳化剂浓度为5%时,单体转化率为92.6%、淀粉接枝率为43.2%、淀粉接枝效率56.4%。