在阴离子水性聚氨酯分散体(WP U )存在下,采用溶胶-凝胶法,通过前驱体正硅酸乙酯(TEOS)的水解、缩合反应,制备出不同 SiO2含量的 WPU/SiO2(WPUS)杂化材料。通过透射电镜、扫描探针显微镜、动态热机械分析仪、紫外-可见光分光光度计分别研究了不同m(TEOS)/m(WPU)对 WPUS 杂化乳液粒子形貌和杂化膜表面形貌、玻璃化转变温度(Tg )及透明度的影响。结果表明,当m(TEOS)/m(WPU)不超过0.50时,杂化乳液中 SiO2粒子以纳米尺寸均匀分散,WP U软段T g 向高温区移动,随着其增大到2.00,SiO2粒子逐渐增大到200 nm 以上,并有形成无机连续相的趋势,且 WP U 软段T g 又向低温区移动；当m(TEOS)/m(WPU)不超过1.00时,杂化膜表面粗糙度逐渐增大,可见光透光率逐渐减小,而随着其增大到2.00,WPUS 杂化膜表面粗糙度减小,可见光透光率增大,即杂化膜透明度提高。
WPU/silica hybrid materials with different content of silica were synthesized by the hydrolysis and condensation of tetraethoxysilane (TEOS)in the presence of anionic WPU dispersion.Influence of m(TEOS)/m(WPU)on the morphology of WPU/silica (WPUS)hybrid emulsion particles,surface morphology,glass transition temperature (Tg )and transmittance of hybrid films were investigated by transmission electron mi-croscopy,scanning probe microscopy,dynamic mechanical analyzer and UV-visible spectrophotometer,respec-tively.When m(TEOS)/m(WPU)was less than 0.50,the silica particle of the hybrid emulsion was distributed uniformly in nanoscale level,and the Tg of soft segment of WPU increases.Whereas the Tg of soft segment of WPU decreases,the particle size of silica increases gradually to more than 200 nm,and the silica particles tend to form a continuous phase when m(TEOS)/m(WPU)increases from 1.00 to 2.00.The surface roughness in-creases and transmittance in the visible zone decreases when m(TEOS)/m(WPU)was not higher than 1.00, the converse was true when that was above 1.00.
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