Herein, poly (acrylic acid) (PAA) microgels were synthesized via alcohol type cross-linked by a free radical precipitation polymerization approach. At the first time, 1,6-hexanediol (1–6 diol), trimethylolpropane (TMP), and pentaerythritol (PEN) were selected as multifunctional cross- linking agent to synthesize cross-linked poly(acrylic acid) microgels. Alcohol type cross-linking agents can connect the PAA chains. The cross-linking reaction takes place due to reaction between hydroxyl groups of various cross-linkers and carboxyl groups of PAA chains. All of the hydroxyl groups do not participate in the reaction with acid groups of polymer chains through the polymerization stage; therefore, unreacted hydroxyl groups will react through sample drying (post-curing stage). The influence of cross-linker functionality and its concentration on various properties like swelling capacity, gel content, Tg (glass transition temperature), and rheological behavior were examined. The PAA microgels prepared via this cross-linking approach were compared to properties of microgels synthesized by epoxy type and vinyl type cross-linking agents in the previous studies. As a result, synthesized microgels via novel mechanisms have higher properties (for example, rheological and thermal properties) than that of PAA microgels prepared via the conventional mechanism. These behaviors can be due to decreasing \(\overline{Mc}\)(average molecular weight of two successive cross-links) in the polymeric network by utilizing new cross-linkers.

在此，聚（丙烯酸）（PAA）微凝胶是通过自由基沉淀聚合方法通过醇型交联合成的。首次选择1,6-己二醇（1-6二醇）、三羟甲基丙烷（TMP）和季戊四醇（PEN）作为多功能交联剂合成交联聚（丙烯酸）微凝胶。醇类交联剂可以连接PAA链。交联反应是由于各种交联剂的羟基与 PAA 链的羧基之间的反应而发生的。在整个聚合阶段，所有的羟基都不参与与聚合物链的酸基反应；因此，未反应的羟基将通过样品干燥（后固化阶段）发生反应. 研究了交联剂官能度及其浓度对溶胀能力、凝胶含量、Tg（玻璃化转变温度）和流变行为等各种性质的影响。通过这种交联方法制备的 PAA 微凝胶与先前研究中由环氧型和乙烯基型交联剂合成的微凝胶的性能进行了比较。因此，通过新机制合成的微凝胶比通过传统机制制备的 PAA 微凝胶具有更高的性能（例如，流变和热性能）。这些行为可能是由于使用新的交联剂降低了聚合物网络中的\(\overline{Mc}\)（两个连续交联的平均分子量）。