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

机译：偏二氯乙烯含量对偏二氯乙烯-丙烯酸甲酯共​​聚物胶乳成膜性能的影响

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Minimum film-formation temperature (MFFT) of vinylidene chloride (VDC)-methyl acrylate (MA) copolymer latexes prepared by batch emulsion polymerization with various compositions from 20 to 97 wt % of VDC were measured. For latexes with VDC content below 90 wt %, MFFT was similar to polymer T-g. As VDC content increased beyond 90 wt %, the MFFT curve plotted against VDC content rose sharply, in contrast with the T-g curve that descended smoothly. Measurements of infrared absorption of latexes in the dispersed state, and X-ray diffraction and infrared absorption of lyophilized polymers were conducted on 40 : 60, 80 : 20, and 95 : 5 VDC-MA specimens. These observations indicated that only 95 : 5 VDC-MA specimens were highly crystalline. It was therefore believed that film-formation property of latex with high VDC content was significantly affected by polymer crystallinity of particles in the dispersed state. Morphology and oxygen gas transmission rate of heat-treated and non-heat-treated coatings of 95 : 5 VDC-MA latex were Investigated. Heat treatment of coatings beyond the temperature at, which crystalline polymer began to melt induced effective particle coalescence, resulting in reduced oxygen gas transmission rate. This supported our belief that film-formation property of VDC-MA latex with high VDC content was significantly affected by polymer crystallinity. (C) 1998 John Wiley & Sons, Inc. [References: 30]
机译：测量了通过分批乳液聚合制备的偏二氯乙烯（VDC）-丙烯酸甲酯（MA）共聚物胶乳的最低成膜温度（MFFT），其中各种成分的VDC为20至97 wt％。对于VDC含量低于90 wt％的胶乳，MFFT与聚合物T-g相似。当VDC含量增加超过90 wt％时，相对于VDC含量绘制的MFFT曲线急剧上升，而T-g曲线平稳下降。在40：60、80：20和95：5 VDC-MA样品上进行了分散状态下胶乳的红外吸收测量以及冻干聚合物的X射线衍射和红外吸收测量。这些观察结果表明，只有95：5 VDC-MA标本是高度结晶的。因此认为，具有高VDC含量的胶乳的成膜性能受到分散状态下颗粒的聚合物结晶度的显着影响。研究了95：5 VDC-MA胶乳的热处理和非热处理涂层的形貌和氧气透过率。涂层的热处理温度超过此温度，此时结晶聚合物开始熔融，诱导有效的粒子聚结，导致氧气传输速率降低。这支持了我们的信念，即高VDC含量的VDC-MA胶乳的成膜性能受聚合物结晶度的影响很大。 （C）1998 John Wiley＆Sons，Inc. [参考：30]

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