AOPA用于高固含量稳定无皂乳液聚合的研究

A STUDY ON HIGH SOLID CONTENT AND STABLE EMULSIFIER FREE EMULSION POLYMERIZATION THAT ADDED WITH AOPA

选用自行合成的β－丙烯酰氧基丙酸（ＡＯＰＡ）用于甲基丙烯酸甲酯（ＭＭＡ）／丙烯酸丁酯（ＢＡ）无皂乳液聚合体系，合成了固含量为６０％ 的稳定乳液，并对相应的共聚物的物理性能进行研究．实验结果表明：乳胶粒粒径在０．３～０．４５μｍ 左右，随ＡＯＰＡ 用量的增加而减小；乳液聚合过程和储存过程稳定，无沉淀产生；共聚物呈无规共聚结构，只存在单一的玻璃化转变温度峰；和常规乳液聚合相比，无皂乳液聚合显著地提高了共聚物的拉伸强度、粘接强度及耐水性，拉伸强度与粘接强度随ＡＯＰＡ 用量的增加而增大，耐水性则随其用量的增加略有降低．另外，与加入丙烯酸的无皂乳液聚合体系比较，ＡＯＰＡ 更具有共聚性，为共聚物提供更好的柔韧性及粘接性能．

acryloxypropionic acid (AOPA) was synthesized and used in the methyl methacrylate (MMA)/butylacrylate (BA) emulsifier free emulsion polymerization system. Stable latexes of 60% solid content were prepared. Properties of the latexes and physical properties of the resulted copolymers were studies. The results showed that diameters of the latexes particles are in 0.3~0.45μm, and decrease with the increasing of the amount of AOPA. The emulsifier free latexes are stable during the synthesis and storage since no precipitation produced for ten months. Only single glass transition temperature peak appears on the dynamic mechanical analysis spectra, indicating that the copolymers are atactic polymers. Compared with the conventional emulsion, tensile strength, adhesion strength, and water resistance are apparently improved. Tensile strength and adhesion strength increase with the increasing of the amount of AOPA, but water resistance decreases with the increasing. In addition, as compared with the emulsifier free emulsion polymerization system that added with acrylic acid (AA),AOPA is more copolymerizable, and provides improved flexibility and adhesion for the copolymers.