γ-(2,3-环氧丙氧)丙基硅氧烷耐高温树脂的合成及热性能

Synthesis and thermal properties for high-temperature resistance resin based on γ-(2,3-glycidoxy) propyl trimethoxysilane

以γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(GPTS)、酸催化剂和混合溶剂等为原料,采用水解-缩合法合成了含环氧基的硅氧烷杂化树脂。以黏度和环氧值为衡量指标,采用单因素试验法优选出制备该杂化树脂的较佳工艺条件,并对其热性能进行了表征。结果表明:在酸性介质中,当n(GPTS)∶n(水)∶n(酸催化剂)∶n(溶剂)=1∶3.0∶0.5∶7.7时,GPTS经水解、缩合反应后,可以获得黏度为1 270～1 320 mPa.s、环氧值为0.183的硅氧烷杂化树脂;该杂化树脂的起始分解温度为270.1℃,800℃时的残炭率(43.0%)相对较高,说明其热稳定性较好。

With γ- （2,3-glycidoxy） propyl trimethoxysilane （ GFFS ）, acid catalyst and mix solvent as raw materials,a siloxane hybrid resin with epoxy group was synthesized by hydrolysis and polycondensation methods. Then with viscosity and epoxy value as evaluation index,the optimal process conditions of preparing hybrid resin were preferred by single-factor experiment ,and its thermal properties were characterized. The results showed that the siloxane hybrid resin with viscosity at 1 270-1 320 mPa·s and epoxy value at 0.183 could be obtained by GPTS＇s hydrolysis and polycondensation in the acid medium when molar ratio of n （GPTS）：n （water）：n （acid eatalyst）：n（solvent） was 1：3.0：0.5：7.7. The hybrid resin had good thermal stability because its initial decomposition temperature was 270.1℃,carbon residue yield at 800 ℃（43.0%） was reversely higher.