Correlation of Silicone Incorporation into Hybrid Acrylic Coatings with the Resulting Hydrophobic and Thermal Properties
Correlation of Silicone Incorporation into Hybrid Acrylic Coatings with the Resulting Hydrophobic and Thermal Properties
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DOI：
10.1021/ma8006015
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发表时间：
2008-10
期刊：
影响因子：
5.5
通讯作者：
Raquel Rodríguez;C. Alarcón;P. Ekanayake;P. McDonald;J. Keddie;M. Barandiaran;J. Asua
中科院分区：
文献类型：
--
作者：
Raquel Rodríguez;C. Alarcón;P. Ekanayake;P. McDonald;J. Keddie;M. Barandiaran;J. Asua
通过细乳液聚合制备了一系列具有不同有机硅浓度和反应活性的高固体含量有机硅-丙烯酸酯杂化乳液。所得涂层的性能与其结构和有机硅接枝的程度相关。最高的有机硅掺入获得与有机硅含有两个反应性的乙烯基基团聚合的连续方法与纯单体的延迟加入。结果发现，接枝到丙烯酸链上的有机硅的量，而不是配方中的总含量，是影响薄膜性能的主要因素。疏水性、耐水性和热稳定性均随接枝有机硅量的增加而增加。涂层含有高水平的非接枝有机硅显示单独的亚微米有机硅相，并表现出较差的性能。当有机硅加入到丙烯酸粒子中时，涂层的总干燥时间缩短，并且作为决定因素的水分分布也得到改善。
A series of high-solids hybrid silicone−acrylic latexes, with varying silicone concentrations and reactivities, was prepared via miniemulsion polymerization. The properties of the resulting coatings have been correlated with their structure and the extent of silicone grafting. The highest silicone incorporation was obtained with silicones containing two reactive vinyl groups polymerized by a semicontinuous method with a delayed addition of neat monomer. It was found that the amount of silicone grafted to the acrylic chains, not the overall total amount in the formulation, was the main factor affecting film properties. Hydrophobicity, water resistance, and thermal stability all increased with the amount of grafted silicone. Coatings that contained high levels of nongrafted silicone displayed separate submicrometer silicone phases and exhibited inferior properties. When silicone was incorporated into the acrylic particles, the total drying time of the coating was shorter, and the water distribution—as deter...