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Soap-free emulsion polymerization of poly (methyl methacrylate-co-butyl acrylate): effects of anionic comonomers and methanol on the different characteristics of the latexes
Colloid and Polymer Science ( IF 2.4 ) Pub Date : 2013-09-13 , DOI: 10.1007/s00396-013-3043-5
Hossein Adelnia 1 , Saeed Pourmahdian 1
Affiliation  

Soap-free emulsion polymerization (SFEP) of methyl methacrylate, butyl acrylate was conducted in water/methanol media with sodium salts of four different acidic comonomers, namely styrene sulfonic acid (NaSS), 2-acrylamide-2-methyl-1-propane sulfonic acid (NaAmps), acrylic acid (NaAA), and itaconic acid (Na2ita). It was found that the introduction of methanol as co-solvent (35 wt%) to the medium greatly decreases the amount of water-soluble polyelectrolyte in the cases NaAA and Na2ita while it does not make difference for NaSS and NaAmps. Having employed the concept of conductance dependency to the ion mobility, the onset concentration in which soluble chains were formed was detected. The addition of sulfonic-based comonomers (NaSS and NaAmps), first decreased particle size and then led to predomination of solution polymerization over SFEP. On the contrary, the incorporation of carboxylic-based comonomers (NaAA and Na2ita) led to increase in particle size. Moreover, the particle size results were in good qualitative agreement with the classical Smith–Ewart theory.

中文翻译:

聚甲基丙烯酸甲酯-共聚丙烯酸丁酯的无皂乳液聚合:阴离子共聚单体和甲醇对乳胶不同特性的影响

甲基丙烯酸甲酯、丙烯酸丁酯的无皂乳液聚合 (SFEP) 在水/甲醇介质中与四种不同酸性共聚单体的钠盐进行,即苯乙烯磺酸 (NaSS)、2-丙烯酰胺-2-甲基-1-丙烷磺酸酸 (NaAmps)、丙烯酸 (NaAA) 和衣康酸 (Na2ita)。结果发现,在 NaAA 和 Na2ita 的情况下,将甲醇作为共溶剂 (35 wt%) 引入介质会大大降低水溶性聚电解质的量,而对 NaSS 和 NaAmps 没有影响。采用电导依赖于离子迁移率的概念,检测了形成可溶性链的起始浓度。添加基于磺酸的共聚单体(NaSS 和 NaAmps),首先减小粒径,然后导致溶液聚合优于 SFEP。相反,羧基共聚单体(NaAA 和 Na2ita)的加入导致粒径增加。此外,粒度结果与经典的 Smith-Ewart 理论具有良好的定性一致性。
更新日期:2013-09-13
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