反相微乳液中疏水缔合型聚丙烯酰胺的合成及其性能研究

在反相微乳液体系中合成了疏水缔合型聚丙烯酰胺 (HAPAM ) ,用Brookfield旋转粘度计测定了其水溶液性能 ,并与传统胶束聚合法制备的HAPAM作了比较 .结果显示 ,前者有更优越的耐盐和抗剪切性能 ,这主要是因为前者的大分子链上疏水共聚单体呈无规分布而后者呈嵌段分布 ,其疏水分子链以分子间而不是分子内缔合为主

STUDY ON SYNTHESIS AND PROPERTIES OF HYDROPHOBICALLY ASSOCIATING POLYACRYLAMIDE IN INVERSE MICROEMULSION

Hydrophobically associating polyacrylamide (HAPAM) was prepared for the first time by inverse microemulsion polymerization.Its rheological properties were determined by using a Brookfield viscometer and compared with those of HAPAM prepared traditionally by micelle polymerization.Results showed that the apparent viscosity of the former kind of HAPAM increased with increasing co\|polymer concentration and co\|monomer content,even if when the co\|polymer concentration was low.As for the latter kind of HAPAM,when the content of co\|monomer increased to 1%,the apparent viscosity decreased so as to be lower than that of the copolymer of which the co\|monomer content was 0.5%.In comparison,the former HAPAM won an advantage over the latter on salt resistance and shear stability.These results were interpreted in terms of hydrophobical associations in aqueous solutions which played an important role in rheological properties:in the macromolecular chain of the former HAPAM,hydrophobical co\|monomers distributed randomly,but not in block.As a result,it was the intermolecular association instead of the intramolecular association predominated,which made the apparent viscosity increase remarkably and improved the salt resistance and shear stability.