摘要
采用助溶剂和硅烷偶联剂(Z-6040)对碱性硅溶胶进行复合改性后添加到聚丙烯酸酯乳液中制备SiO2/聚丙烯酸酯杂合乳液(Si/PAE),分别考查助溶剂的种类和用量对硅溶胶的溶胶-凝胶化(sol-gel)反应及复合涂层综合性能的影响,结果发现:异丙醇是合适的助溶剂,其最佳添加量为硅溶胶质量的10%。TEM测试和纳米粒径分析发现:助溶剂可以提高无机硅颗粒在杂合乳液中的分散能力,降低Si/PAE的平均粒径。傅里叶红外光谱(FT-IR)和原子力显微镜(AFM)分析说明:Si/PAE乳液在成膜过程中,助溶剂可驱使硅溶胶发生sol-gel反应,并在涂层表面富集含硅聚合物,Si/PAE的涂层结构平整且致密。TGA分析发现:Si/PAE涂层具有较好的热稳定性。
SiO2/polyacrylate composite emulsions（Si/PAE） were prepared by polyacrylate emulsions（PAE） mixing with alkaline silica sol modified by a saline coupling agent and a co-solvent.The effects of kinds and amounts of co-solvents on the sol-gel reaction and the properties of composite films were investigated.The results indicate that isopropanol is the best co-solvent and the optimal dosage is 10 wt% of the silica sol.The nano-granularity analysis and TEM photos show that co-solvents can make the silica particles distribute more evenly in the composite emulsions and reduce the average diameters of the Si/PAE.The FT-IR spectra and AFM pictures indicate that co-solvents could induce the occurrence of sol-gel reaction of silica sol to form Si-based polymers on the surface of films during the film formation.Si/PAE films display excellent properties besides high gloss and compact.TGA curves indicate that the Si/PAE films exhibit higher thermal stability than PAE.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2010年第3期29-35,共7页
Acta Materiae Compositae Sinica
基金
粤港关键领域重点突破项目招标课题(B10-B2050260)
