用于自修复复合材料的新型玻璃纤维负载铂催化剂:结构与活性

通过在玻璃纤维(GF)上接枝1,3,5,7-四甲基-1,3,5,7-四乙烯基环四硅氧烷(D4Vi)的方法,制备了一种新的负载型铂基催化剂(GF-Pt).制备过程是:先用甲基二氯硅烷对玻璃纤维表面进行硅烷化处理使玻璃纤维表面键合硅氢键,然后以Pt(0)-D4Vi络合物为催化剂催化D4Vi与硅氢键反应,从而在玻璃纤维表面接上D4Vi环并同时络合有铂.傅里叶变换红外光谱、场发射扫描电镜、X射线能谱和热重分析研究结果表明,D4Vi环成功地以共价键键合于纤维表面.采用苯乙烯与甲基二乙氧基硅烷的硅氢化反应对该催化剂的催化性能进行了表征.结果表明,该催化剂能在室温下有效地催化硅氢化反应,能符合所设计的聚合物基自修复复合材料体系的特殊要求.

A Novel Glass Fiber-Supported Platinum Catalyst for Self-healing Polymer Composites: Structure and Reactivity

A platinum-based catalyst supported on glass fiber grafted with 1,3,5,7-tetramethyl-1,3,5,7-tetravinyl cyclotetrasiloxane (D4Vi) was prepared and evaluated for the hydrosilylation reaction of styrene and methyldiethoxysilane. The silanization of the glass fiber was carried out with methyldichlorosilane. D4Vi was then anchored on the modified fiber with Si-H bonds through a hydrosilylation reaction mediated by a Pt(0)-D4Vi complex solution catalyst. Fourier transform infrared spectroscopy, field emission scanning electron microscopy, X-ray energy dispersion spectroscopy, and thermogravimetric data showed that D4Vi was covalently bonded onto the fiber surface. The very high density of D4Vi grafting confers a strong hydrophobic character to the modified fiber surface. Fairly good catalytic activity for the hydrosilylation reaction between styrene and methyldiethoxysilane was observed on this catalyst.