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首页> 外文期刊>Journal of Applied Polymer Science >Effect of storage on film-formation property of vinylidene chloride-acrylonitrile-methyl acrylate terpolymer latex
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Effect of storage on film-formation property of vinylidene chloride-acrylonitrile-methyl acrylate terpolymer latex

机译：储存对偏二氯乙烯-丙烯腈-丙烯酸甲酯三元共聚物胶乳成膜性能的影响

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Latex prepared from 91 : 5 : 4 wt % vinylidene chloride-acrylonitrile-methyl acrylate monomer mixture by seeded semicontinuous emulsion polymerization was investigated for a change in minimum film-formation temperature (MFFT) during storage, with focus placed on polymer crystallinity in the dispersed state. MFFT rose from 20 degrees C to 32 degrees C, with storage at 20 degrees C for 49 weeks, Infrared absorption of fresh and stored latexes in the dispersed state indicated an increase in absorbance at 1048 cm(-1), which is characteristic of a crystalline vinylidene chloride polymer, that correlated wi the MFFT rise with storage. This suggested that the MFFT rise with storage was caused by increasing crystallinity of the polymer in the dispersed state. X-ray wide-angle diffraction and infrared absorption of powder polymers obtained by lyophilization of fresh and stored latexes also indicated increasing crystallinity with latex storage. Oxygen gas permeabilities of films coated with fresh and stored latexes were measured. Latex stored for long periods exhibited poor barrier property, indicating that such latex is unsuitable as an industrial barrier coating material for films and papers. (C) 1998 John Wiley & Sons, Inc. [References: 17]
机译：研究了由91：5：4重量％的偏二氯乙烯-丙烯腈-丙烯酸甲酯单体混合物通过种子半连续乳液聚合制备的胶乳在储存过程中最低成膜温度（MFFT）的变化，重点是分散液中的聚合物结晶度州。 MFFT从20摄氏度上升到32摄氏度，在20摄氏度下存储49周，分散状态下新鲜和储存乳胶的红外吸收表明在1048 cm（-1）处的吸光度增加。结晶的偏二氯乙烯聚合物，其MFFT上升与储存量相关。这表明MFFT随储存的增加是由于分散状态下聚合物结晶度的增加引起的。通过冻干新鲜和储存的胶乳获得的粉末聚合物的X射线广角衍射和红外吸收也表明随着胶乳储存的增加结晶度。测量涂有新鲜和储存乳胶的薄膜的氧气渗透率。长时间储存​​的乳胶表现出较差的阻隔性，这表明这种乳胶不适合用作薄膜和纸张的工业阻隔涂料。 （C）1998 John Wiley＆Sons，Inc. [参考：17]

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