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首页> 外文期刊>Polymers for advanced technologies >Effects of alkali post-treatment on the particle morphology of soap-free poly(methyl methacrylate-ethyl acrylate-acrylic acid) latices
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Effects of alkali post-treatment on the particle morphology of soap-free poly(methyl methacrylate-ethyl acrylate-acrylic acid) latices

机译：碱后处理对无皂聚甲基丙烯酸甲酯-丙烯酸乙酯-丙烯酸胶乳颗粒形貌的影响

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摘要

Poly(methyl methacrylate-ethyl acrylate-acrylic acid) P(MMA-EA-AA) latices with narrow particle size distribution and "clean" particle surface were first synthesized by batch soap-free emulsion polymerization, and the latex particles with anomalous morphology were obtained by alkali post-treatment. Effects of treatment temperature and time, initial pH value, as well as 2-butanone amount, on the morphology of latex particles were investigated. Results showed that anomalous structure of the dried latex particles could be easily identified using transmission electron microscopy (TEM) observation under the conditions of temperature >60℃, initial pH > 10.5 and 4.0-7.0ml of 2-butanone used. The higher the pH value is, the earlier the anomalous structure will occur. The volume expansion (AV) of the particle increased with the increase in treatment temperature and 2-butanone amount. However, with the increase of initial pH value and treatment time, A V increased first and then decreased, and different maximum of AV values were observed based on different conditions.
机译：首先通过分批无皂乳液聚合法合成了具有窄粒度分布和“干净”颗粒表面的聚（甲基丙烯酸甲酯-丙烯酸乙酯-丙烯酸）P（MMA-EA-AA）胶乳，且具有异常形态的胶乳颗粒为通过碱后处理获得。研究了处理温度和时间，初始pH值以及2-丁酮用量对乳胶颗粒形态的影响。结果表明，在温度> 60℃，初始pH> 10.5和使用4.0-7.0ml的2-丁酮的条件下，通过透射电子显微镜（TEM）观察可以很容易地识别出干燥的胶乳颗粒的异常结构。 pH值越高，异常结构越早发生。随着处理温度和2-丁酮量的增加，颗粒的体积膨胀（AV）增加。但是，随着初始pH值和处理时间的增加，AV值先上升然后下降，并且根据不同的条件观察到最大的AV值。

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