中国塑料 ›› 2007, Vol. 21 ›› Issue (4): 69-72.

• 加工与应用 • 上一篇    下一篇

二氧化硅表面处理及其对聚二甲基硅氧烷体系凝胶时间的影响

贾丽亚1,刘和平2,杜中杰1,张晨1,励杭泉1*   

  1. 1.北京化工大学高分子材料制备与加工重点实验室,北京100029;2.中国兵器工业203研究所,陕西西安710065
  • 出版日期:2007-04-26 发布日期:2021-05-19

Surface Modification of Silica and Its Influence on the Gel Time of Polydimethylsiloxane System

JIA Li-ya1,LIU He-ping2,DU Zhong-jie1,ZHANG Chen1, LI Hang-quan1*   

  1. 1 .The Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials,Beijing University of Chemical Technology, Beijing 100029, China;2. No. 203 Research Insititute of China Ordnance Industries, Xi}an 710065, China
  • Online:2007-04-26 Published:2021-05-19

摘要: 以六甲基二硅胺烷及六甲基环三硅氧烷(})为原料,通过干法对二氧化硅进行了表面处理,并研究了二氧化硅预处理温度对改性二氧化硅填充聚硅氧烷体系凝胶时间及力学性能的影响。利用红外光谱(F工IR)及X射线光电子能谱( XPS)研究了二氧化硅的组成,利用二氧化硅在溶剂中的分散情况研究了处理效果。结果表明:二氧化硅表面接枝上Me3Si一及一MezSi-,在有机溶剂中的溶解性变好;随着二氧化硅预处理温度的提高,二氧化硅填充聚硅氧烷体系凝胶时间缩短,力学性能呈下降趋势。随二氧化硅含量的增加,力学性能呈明显上升趋势。

关键词: 二氧化硅, 表面改性, 凝胶时间, 力学性能

Abstract: Silica was modified with hexamethyldisilazane and hexamethyltrisiloxane(D3) via dry method. The influence of pre-treatment temperature on gel time and mechanical properties of modified silica filled polydimethylsiloxane system wasstudied.Modified silica was examined by Fourier transfor- mation infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),and dispersion in sol vent. The mechanical properties of modified silica filled polydimethylsiloxane system were also investi- gated. The results reveal that Me3Si-and-Me2Si moieties were grafted on the surface of silica. When pre-treatment temperature was increased, the gel time of silica filled polydimethylsiloxane system increased and mechanical properties decreased. With silica content increasing, the tensile strength and stress at 100 % elongation increased.

Key words: silica, surface modification, gel time, mechanical property

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