摘要
采用硅烷偶联剂对硅溶胶进行改性,添加到聚丙烯酸酯乳液(PAE)中制备聚丙烯酸酯/SiO2杂合乳液(Si-PAE),研究了硅烷偶联剂的种类和添加量对涂膜性能的影响。结果发现,3-缩水甘油基丙基三甲氧基硅烷(Z-6040)含有环氧基和甲氧基硅基团,在成膜过程中能分别与PAE链段上羧基(-COO-)和硅溶胶的硅醇(Si-OH)反应,形成Si-O-Si交联网络,提高了Si-PAE涂膜的交联密度;Z-6040的合适添加量为硅溶胶质量的4.0%;纳米粒径分析表明,Z-6040改性后的Si-PAE平均粒径减小,硅溶胶在Si-PAE乳液中分散更均匀;原子力显微镜(AFM)分析发现Si-PAE涂层结构平整致密;热重分析(TGA)曲线表明Si-PAE涂膜热稳定性较PAE高。
Polyacrylate/SiO2 hybrid emulsions were prepared by polyacrylate emulsions (PAE) mixing with alkaline silica sol modified by coupling agents. The effects of silane coupling agent categories and contents on the properties of Si-PAE films were discussed. The results show that the 3-glycidxypropyl trimethoxy silane (Z-6040) with a epoxy group and a methoxysilane group can react with the carboxyl groups of PAE and the Si-OH groups on the surface of silica sol to form Si-O-Si crosslinking polymer nets during the film formation,therefore,increasing the crosslinking degree of Si-PAE films and the optimal content of Z-6040 is 4.0% of the silica sol mass. Nano-granularity analysis and TEM photos indicate that the Z-6040 decrease the average diameters of Si-PAE particles and drive the silica sol uniformly dispersed surround the PAE. AFM pictures disclose that Si-PAE films are flat and compact. Thermogravimetry analysis(TGA) curves show that Si-PAE films display much better thermal stability than that of PAE.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2010年第10期76-80,共5页
Polymer Materials Science & Engineering
基金
粤港关键领域重点突破项目招标课题(B10-B2050260)