不同分子量固态与液态聚碳硅烷的黏度特性

Viscosity of Solid and Liquid Polycarbosilanes With Different Molecular Weight

采用GPC、流变仪等分析手段对不同分子量的固态PCS和液态PCS的黏度进行表征。分析了PCS分子量、软化点及黏度特性之间的关系。此外还用热重法对固态和液态PCS陶瓷产率进行表征。结果表明,LPCS在室温黏度较低,陶瓷产率较高(77%),而固态PCS熔体在>200℃具有较低黏度(500 mPa.s),因此LPCS更适于用作PIP法制备陶瓷基复合材料浸渍前驱体。

The viscosity of solid and liquid polycarbosilanes with different molecular weight were investigated based on GPC and Rheometer analysis.And the relationship between molecular weight,soft temperature and viscosity were established.The ceramic yields of these polycarbosilanes were reported based on TGA.The results indicated LPCS had lower viscosity（under 200 mPa·s） at room temperature and higher ceramic yields（77%,N2）,whereas the molten solid PCS had viscosity of 500 mPa·s only above 200℃ so that LPCS is more suitable for room temperature PIP than PCS to make ceramic matrix composites.