二乙烯基硅氧烷-双苯并环丁烯预聚体的研究

STUDY ON DIVINYL TETRAMETHYL DISILOXANE-BISBENZOZYCLOBUTENE PREPOLYMER

研究了二乙烯基硅氧烷-双苯并环丁烯树脂本体的预聚及预聚体的流变行为。考察了树脂预聚时间对树脂固化挥发率、粘度及固化体积收缩率的影响,通过FT-IR跟踪了预聚反应的进程和特征官能团的变化,采用锥板流变仪研究了预聚体的流变。研究结果表明:树脂适宜的预聚时间为3.5 h,其相应预聚体的粘度为6.603 Pa.s,固化体积收缩率为5.51%,固化程度为18.2%,此时预聚体仍属于牛顿流体,其粘流活化能随预聚进程而增加。

The bulk polymerization of divinyl tetramethyl disiloxane-bisbenzocyclobutene and rheology of the prepolymer was studied. The influences of the pre-polymerization time on the viscosity and the volatility of the prepolymer and volumetric shrinkage after curing was evaluated. The prepolymerization progress and the variation of the reactively functional groups during the polymerization were characterized by FT-IR and the rheology of the prepolymer was investigated with a rheometer. The results showed that the suitable pre polymeric time was 3.5 h, and the corresponding visicosity was 6. 603 Pa · s, the volumetric shrinkage was 5. 51% and the curing degree was 18.8%. With this presetted time （i. e. in 3.5 h）, the divinyl tetramethyl disiloxane-bisbenzocyclobutene prepolymer was a Newton fluid and the activation energy of flow increased with the prepolymerization process.