可分散性纳米二氧化硅增强硅橡胶

刘丰; 郑秋红; 李小红; 丁涛; 张治军

可分散性纳米二氧化硅增强硅橡胶

1.
河南大学特种功能材料重点实验室, 开封 475001 ;
2.
北京化工大学北京市新型高分子材料制备与成型加工重点实验室, 北京 100029

基金项目: 国家高技术研究发展计划(2002AA302607)

详细信息

通讯作者:
张治军, 教授, 主要从事复合纳米微粒的制备与应用　E-mail : zhangzhijun @henu. edu. cn

中图分类号: TQ333. 4
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出版历程
- 收稿日期: 2006-01-10
- 修回日期: 2006-04-02
- 刊出日期: 2006-12-14

Sil icone rubber reinforced by a dispersible nano-sil ica

1.
Key Lab for Special Functional Materials| Henan University| Kaifeng 475001| China ;

摘要

摘要: 采用表面经过硅烷偶联剂原位修饰的纳米二氧化硅增强硅橡胶。通过扫描电子显微镜和Payne 效应考察了纳米二氧化硅在硅橡胶中的分散特性; 用DSC 分析了复合体系的低温结晶行为; 考察了填料对硅橡胶力学性能的影响。结果表明, 由于修饰后纳米颗粒表面非极性有机基团的存在和表面能的降低, 无须加入分散剂, 纳米颗粒就能在硅橡胶中有较好的分散; 在各自最优添加量时, DNS-3 链状纳米二氧化硅增强的硅橡胶相对于气相法二氧化硅增强的硅橡胶在拉伸强度、撕裂强度及断裂伸长率上有显著提高; DNS-2 纳米二氧化硅增强性能与气相法二氧化硅的相当, 但前者混炼胶黏度较小, 有较好的加工性。
- 纳米二氧化硅 /
- 硅橡胶 /
- 增强 /
- 力学性能
Abstract: A novel nano-silica surface-modified by silane was used as a reinforcing filler for HTV (heat vulcanization) silicone rubber. The dispersion morphologies and network st ructure of the composites were analysed by scanning elect ronic microscopy (SEM) and Payne effect ; the crystal behavior at low temperature was studied by differential scanning calorimet ry(DSC) . And the effect of these fillers on the mechanical properties of silicone rubber was investigated. Because the surface of these nanoparticles was enwrapped by apolar methyl , they can disperse in therubber perfectly without adding any dispersant . The result s indicate that at respective optimum content , the catenarian nano-silica (DNS-3) has evidently better reinforcement to silicone rubber in the tensile st rength , tear st rengthand elongation at break than the silica nanoparticle synthesized by aerosol method (A-200) . The DNS-2 nano-silicahas a similar reinforcing effect to nanO₂silica compared with A-200 , but the gross rubber of the DNS-2 system wassof ter and has better processability than that of A-200.
- nano-silica /
- silicone rubber /
- reinforcement /
- mechanical properties