AM_nBS_SSS三元疏水缔合聚合物PAnBS的合成及溶液性能研究

Synthesis and solution properties of acrylamide-4-vinylbenzenesulfonate - n-butyl styrene tercopolymer PAnBS

摘要:

以正丁基苯乙烯（nBS）、对乙烯基苯磺酸钠(SSS)和丙烯酰胺（AM）为原料，采用自由基胶束聚合法合成了阴离子型三元疏水缔合聚合物PAnBS。利用红外光谱法、紫外光谱法以及核磁共振氢谱法对共聚物的结构进行了表征；考察了不同反应条件对共聚物溶液表观黏度的影响，得到了具有较强增粘能力的聚合物合成工艺条件：nBS、SSS和引发剂加量分别为总单体摩尔分数的1.5%、9%和0.1%，总单体和表面活性剂十二烷基硫酸钠（SDS）在溶液中的质量分数分别为25%和6%，反应温度50℃，反应时间10h。与分子量1.97?07、水解度19.43%的部分水解聚丙烯酰胺相比，所得PAnBS在NaCl 或CaCl2水溶液中具有更强的增黏能力；PAnBS在淡水或盐水溶液中于80℃下的耐老化性能优于HPAM，表现出优良的耐温抗盐性能。

Abstract:

A hydrophobically associating anionic terpolymer PAnBS was prepared by free-radical micelle copolymerization of acrylamide,sodium 4-vinylbenzenesulfonate(SSS) and n-butyl styrene(nBS).The structure of the synthesized polymer was characterized by means of UV, FT-IR, 1H-NMR.The influence of polymerization reaction conditions on the apparent viscosity of the polymerization product aqueous solution was studied.The optimum reaction conditions were determined as follow:mole percentage of nBS,SSS and initiator were 1.5%,9% and 0.1% relative to total monomers,mass percentage of total monomers and surfactan(SDS)were 25% and 6%;the reaction temperature and reaction time were 50℃ and 10h respectively. The increasing viscosity ability of PAnBS prepared under the above reaction conditions in sodium chloride or calcium chloride aqueous solution is stronger than that of partially hydrolyzed polyacrylamide with molecular weight of 1.97 ?107and hydrolysis degree of 19.43%. The viscosity of polymer aqueous solution declined slightly with the increase of temperature ,which indicated that the synthesized copolymer had good performance of salt and temperature resistance.