Comparison of the different emulsion polymerization routes between acrylic and vinyl acetate monomers using poly(vinyl alcohol) as the sole stabilizer
Comparison of the different emulsion polymerization routes between acrylic and vinyl acetate monomers using poly(vinyl alcohol) as the sole stabilizer
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使用聚乙烯醇作为唯一稳定剂的丙烯酸酯和醋酸乙烯酯单体的不同乳液聚合路线的比较
DOI：
10.1007/s00396-011-2579-5
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发表时间：
2012
影响因子：
2.4
通讯作者：
Zhengbin Xia
中科院分区：
文献类型：
--
作者：
Lin Niu;Zhengbin Xia
以聚乙烯醇（PVA）为保护胶体的丙烯酸酯和醋酸乙烯酯单体的乳液聚合研究已有很长时间，但对两种体系进行横向比较的报道很少，PVA/MMA聚合体系不稳定的原因也不清楚。本文分别以甲基丙烯酸甲酯（MMA）和醋酸乙烯酯（VAc）为原料，以不同用量的聚乙烯醇（PVA）为唯一稳定剂，进行了一系列实验。通过红外光谱和核磁共振谱表征了聚合产物的接枝程度，发现PVA/MMA共聚物中PVA的接枝量比PVA/VAc共聚物中PVA的接枝量更大，因此考虑了PVA的接枝方式。动力学分析表明，硫酸根对MMA的引发速率较慢，导致相应胶体不稳定，同时自由基对PVA的吸氢较快，导致内部形成“层层”接枝结构，降低了粒子表面接枝密度。用TEM和静态接触角测量证明了这一点，并采用伪均聚物模型来描述胶体稳定性与表面PVA密度的关系。
The emulsion polymerization of acrylic and vinyl acetate monomers using poly(vinyl alcohol) (PVA) as protective colloid has been studied for a long time, whereas rare reports ranged over the lateral comparison of the two systems and the reason for the unstability of the PVA/MMA polymerization system was still indistinct. Here in this paper, a collection of experiments of methyl methacrylate (MMA) and vinyl acetate (VAc) were performed respectively with varied amount of PVA as the sole stabilizer. The grafting extent of the polymerisate was characterized through the fraction and FTIR and it was found that the grafted amount of PVA was even larger in the PVA/MMA copolymers than PVA/VAc copolymers, so the grafted mode of PVA was considered. Based on the kinetics, the slower initiation rate of sulfate radical towards MMA was found to be responsible for the unstability of corresponding colloids accompanied with the relatively quicker hydrogen abstraction of radical to PVA, which resulted in “layer-by-layer” grafting structure inside and the particle surface-grafting density was lowered thereof. This was proved with TEM and static contact angle measurements and a pseudo-homopolymer model was employed to describe the relationship of colloidal stability and the PVA density on surfaces.
DOI：
10.1021/la061429s
发表时间：
2006-10
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
--
作者：
M. Okubo;Hiroshi Kobayashi;Takumi Matoba;Y. Oshima
通讯作者：
M. Okubo;Hiroshi Kobayashi;Takumi Matoba;Y. Oshima
乳液共聚过程中非离子乳化剂掺入羧化聚合物颗粒中：甲基丙烯酸含量的影响
DOI：
--
发表时间：
2009
期刊：
Langmuir 25巻
影响因子：
--
作者：
大野泰生;若林徳子;Noriko Wakabayashi;若林徳子;若林徳子;若林徳子;若林徳子;若林徳子;Hiroshi Kobayashi
通讯作者：
Hiroshi Kobayashi