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Preparation of Cross-linked Monodisperse Poly(acrylic acid) Particles by Precipitation Polymerization.
Langmuir ( IF 3.7 ) Pub Date : 2020-09-15 , DOI: 10.1021/acs.langmuir.0c02060 Takanori Nakano 1 , Naohiko Saito 2 , Hideto Minami 1
Langmuir ( IF 3.7 ) Pub Date : 2020-09-15 , DOI: 10.1021/acs.langmuir.0c02060 Takanori Nakano 1 , Naohiko Saito 2 , Hideto Minami 1
Affiliation
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Water-soluble polymers such as poly(acrylic acid) (PAA) are widely applied in dispersants, thickeners, flocculants, and superabsorbent polymers. Here, submicrometer-sized monodisperse PAA particles were successfully prepared by precipitation polymerization in acetonitrile at 55 °C with 2,2′-azobis(2,4-dimethylvaleronitrile) as an initiator. In a medium with a high dielectric constant, the particles were stabilized by electrostatic repulsion without a colloidal stabilizer during the polymerization. Moreover, the obtained PAA particles were spontaneously cross-linked in the absence of a cross-linker. The degree of the cross-linking was strongly dependent on the amount of water (500–10,000 ppm) in the polymerization medium. The PAA particles swelled more with acrylic acid with an increase in the amount of water. Thus, in the case of high water content, the particles would become the main polymerization loci, which in turn results in the cross-linking structures owing to the α-hydrogen abstraction of PAA chains during the polymerization.
中文翻译：
沉淀聚合制备交联的单分散聚（丙烯酸）颗粒。
水溶性聚合物，例如聚丙烯酸（PAA），广泛用于分散剂，增稠剂，絮凝剂和超吸收性聚合物中。在此，以2,2'-偶氮双（2,4-二甲基戊腈）为引发剂，在55°C的乙腈中进行沉淀聚合，成功制备了亚微米级的单分散PAA颗粒。在具有高介电常数的介质中，在聚合过程中，在没有胶体稳定剂的情况下，通过静电排斥使颗粒稳定。此外，在不存在交联剂的情况下，将获得的PAA颗粒自发地交联。交联的程度很大程度上取决于聚合介质中的水量（500–10,000 ppm）。随着水量的增加，PAA颗粒更多地被丙烯酸溶胀。从而，
更新日期：2020-10-13
中文翻译：
沉淀聚合制备交联的单分散聚（丙烯酸）颗粒。
水溶性聚合物，例如聚丙烯酸（PAA），广泛用于分散剂，增稠剂，絮凝剂和超吸收性聚合物中。在此，以2,2'-偶氮双（2,4-二甲基戊腈）为引发剂，在55°C的乙腈中进行沉淀聚合，成功制备了亚微米级的单分散PAA颗粒。在具有高介电常数的介质中，在聚合过程中，在没有胶体稳定剂的情况下，通过静电排斥使颗粒稳定。此外，在不存在交联剂的情况下，将获得的PAA颗粒自发地交联。交联的程度很大程度上取决于聚合介质中的水量（500–10,000 ppm）。随着水量的增加，PAA颗粒更多地被丙烯酸溶胀。从而，
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