高硅含量硅-苯丙乳液的合成及性能研究

Study on Synthesis and Performance of Alkylsilane Modified Polystyrene(PS)-Polyacrylate(PA) Emulsion with High Alkylsilane Content

以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、苯乙烯(St)为主要原料,以乙烯基三甲氧基硅烷(A-171)为改性单体,以烯丙基聚乙氧基磺酸盐(SE-10N)和十二烷基苯磺酸钠(DSB)为混合乳化剂,采用水溶性引发剂过硫酸铵(APS)和亚硫酸氢钠(SBS)与油溶性引发剂偶氮二异丁腈(AIBN)2种引发体系相配合的方式,通过烷氧基硅烷和苯乙烯混合单体对丙烯酸酯种子乳液先渗透溶胀,再进行聚合的方法(单体渗透法)合成了A-171含量高达50%的硅-苯丙乳液。利用傅里叶变换红外光谱仪对聚合物结构进行了分析,证明了A-171的引入,通过透射电子显微镜(TEM)对粒子形态、粒径分布进行了表征,用原子力显微镜(AFM)、扫描电子显微镜(SEM)相结合的方法对乳液的成膜性能以及成膜助剂的作用进行了分析。最后通过性能测试证明,A-171含量的提高有利于降低涂膜的吸水率,增强涂膜的热稳定性。

A stable alkylsilane modified polystyrene（PS） - polyaerylate （ PA ） emulsion with high alkylsi- lane content （50%） was prepared via a monomer penetralion method. In the synthesis, methyl methacrvlate （MMA）, hutyl acrylate （BA）, styrene （St） were used as main monomers, and vinyl trimethoxysilane （ A - 171 ） as the modification monomer, 1 - nonylphenyloxy - 2 - deca （ oxyethylene ） - 3 - allyloxypropane ammoniunl sulfate （ SE - ION） and sodium alkylated diphenyl ether disulfonate （ DSB ） as emislsifiers, water - soluhle ammonium persulfate （APS） , sodium bist, lfate（SBS） and oil - soluhle 2,2 ＇ - azobis （isobutyronilrile） （AIBN） as compound initiator system. A -171 was pre- mixed with St and swelled in the PA seed emulsion for the stable polymerization of A - 171 with high content. The structure of the copoly- mer was analyzed lay Fourier transform infrare（t spectroscopy （ FT - 1R）. The size and structure of latex par- ticles were analyzed by transmission electron microscope （TEM）. The scanning electron microscope （ SEM ） and atomic force microscope （AFM） were applied to characterize the fibn -forming performance and func- tion of coaleseente. Furthermore, the effects of A - 171 content on the water absorption and heat resistance properties of Ihe latex films were studied. The resuhs showed that the introduction of A - 171 with high con- tent could effectively reduce the water absorption anal improve the heat resistance of latex fihns.