白炭黑原位复合聚丙烯酰胺水凝胶的合成及次级网络对流变行为的影响  

Synthesis and the Second Networks Effects on Rheological Behaviors of Polyacrylamide Hydrogel by Silica In-Situ Polymerization

作　　者：苏智青[1] 何佳[1] 姜祖明[1] 黄光速[1] 

机构地区：[1]四川大学高分子科学与工程学院,高分子材料工程国家重点实验室,四川成都610065

出　　处：《高分子材料科学与工程》2011年第3期124-127,共4页Polymer Materials Science & Engineering

基　　金：国家科技重大专项“高温高盐油田提高采收率技术”(2008ZX05011)

摘　　要：采用水溶液聚合法,通过丙烯酰胺与白炭黑原位复合,制备出复合聚丙烯酰胺凝胶。采用高级流变仪和红外吸收光谱证实了白炭黑与聚丙烯酰胺形成的次级网络的存在,通过对比不同白炭黑填充量和不同吸水倍数对聚丙烯酰胺水凝胶模量、损耗角正切、零切黏度和流动指数的影响,发现白炭黑的加入对聚丙烯酰胺凝胶力学性能的贡献,随着白炭黑用量在0%～3%范围内增加,凝胶交联密度增大,弹性增强,流动性降低。当亲水型白炭黑T40用量在3%时,水凝胶的弹性模量在0.1 Hz时达100 Pa,而疏水型白炭黑H2000填充的水凝胶在0.1 Hz时弹性模量小于0.1 Pa,确切反映了次级网络的明显影响。Polyacrylamide（PAM）/SiO2 hybird hydrogels were synthesized by silica-acrylamide in-situ composit via aqueous solution polymerization.Potassium persulfate was used as the initiator,acrylamide（AM） as main monomer and polyethylene glycol diacrylate as the crsosslinker.Analysis to the tests by oscillation rheometer and infraed spectrometer demonstrate existence of the second networks formed by silica and polyacrylamide.And the influence of the second networks is found on modulus,zero shear viscosity,flow coefficient and tanδ of the PAM hydrogels with the different ratio of Silica.Through comparison on the zero shear viscosity and the flow coefficient of AM/silica hydrogel with different diploid water-absorbent,the principle reinforced from the second networks and its origin are presented.

关 键 词：聚丙烯酰胺 白炭黑 水凝胶 

分 类 号：TQ427.25[化学工程]