分散聚合法制备P（AM—AN）微凝胶及其性能研究

Preparation and Research of Poly （acrylamide-acrylonitrile） Microgels by Dispersion Copolymerization

以偶氮二异丁腈（AIBN）为引发剂，N，N’-亚甲基双丙烯酰胺（Bis—A）为交联剂，聚乙烯吡咯烷酮（PVPK-30）为稳定剂，在乙醇／水的混合介质中使亲水性丙烯酰胺（AM）与疏水性丙烯腈（AN）进行分散共聚，制得一系列P（AM—AN）微凝胶，通过扫描电子显微镜（SEM）和差示扫描量热仪（DSC）考察了共聚单体AN的用量对微凝胶形态及其热稳定性的影响，结果表明，随着反应体系中AN用量的增大，所得微凝胶的玻璃化转变温度提高，有利于其在较高温度下使用。

A series of crosslinked poly（acrylamide-acrylontrile） microgels were prepared by dispersion and copolymeriza- tion of hydrophilic aerylamide with hydrophobie acrylontrile monomer taken azobisisobutyronitrile （AIBN） as initiator, N, N＇-methylenebisaerylamide （Bis-A） as crosslinker, polyvinylpyrrolidon （PVP K-30） as stabilizer in an aqueous alcoholic media. The effects of volume ratio of ethanol to water, total monomer concentration, mass ratio of AM/AN, content of sta- bilizer, initiator and crosslinker on the average particle size of P （AM-AN） microgels were studied respectively. The re- sults showed that with increasing the AN dosage in the reaction system, the microgel glass transition temperature rised, which is conducive to use in high temperature.