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益so that LPCS is more suitable for room temperature
PIP than PCS to make ceramic matrix composites