丙烯酸丁酯-苯乙烯-丙烯腈共聚物/二氧化钛复合薄膜的制备、表征及性能

Preparation,characterization and properties of butyl acrylate-styrene-acrylonitrile copolymer/titanium dioxide composite film

先以丙烯酸丁酯、苯乙烯和丙烯腈为原料,通过种子乳液聚合制得了以聚丙烯酸丁酯为核、苯乙烯-丙烯腈共聚物为壳的核壳接枝共聚物ASA;再以钛酸正四丁酯和偶联剂γ-(甲基丙烯酰氧基)丙基三甲氧基硅(KH-570)为原料,经水解缩合生成KH-570-g-TiO2粒子。将ASA与KH-570-g-TiO2粒子按照一定比例溶解并超声共混,在普通玻璃表面制得了ASA/TiO2复合薄膜。用傅里叶变换红外光谱、热重分析、透射电镜及紫外可见光谱等对产物和薄膜进行了分析表征。结果显示,制得的ASA接枝共聚物具有明显的核壳结构,乳液粒子大小均匀,聚丙烯酸丁酯核的平均粒径为60 nm左右,壳的平均厚为20 nm。KH-570水解的羟基与纳米TiO2表面的羟基发生了缩合反应。与纯ASA薄膜相比,ASA/TiO2复合薄膜在紫外区的吸收更强,且最大吸收波长蓝移;复合薄膜的耐热性能要优于纯ASA薄膜,同时耐酸碱性能有所提高。

Butyl acrylate-styrene-acrylonitrile core-shell graft copolymer（ASA） with poly（butyl acrylate） as core and styrene-acrylonitrile copolymer as shell was synthesized by seeded emulsion polymerization,KH-570-g-TiO2 particle was prepared through hydrolysis condensation of coupling agent KH-570 and tetra-n-butyl titanate,and ASA and KH-570-g-TiO2 were blended with a certain ratio by ultrasonic mixing.Finally,the composite films were prepared on a glass substrate and characterized by Fourier transform-infrared spectroscopy,thermogravimetric analysis,transmission electron microscope and ultraviolet-visible spectroscopy.The results showed that the ASA graft copolymer had an obvious core-shell structure and the particle size of the emulsion was homogeneous.The average diameter of poly（butyl acrylate） core was about 60 nm,and the shell thickness was about 20 nm.The condensation reaction occurred between the hydroxyl groups from the hydrolysis of KH-570 and on TiO2 surface.The ASA-TiO2 composite film absorbed more ultraviolet light compared with ASA film.Meanwhile,the heat resistance and the acid and alkali resistance of the composite film were also improved.