聚二甲基硅氧烷/苯基MDQ硅树脂杂化体系的流变特性

Rheological Properties of Polydimethylsiloxane/Phenyl-Substituted MDQ Silicon Resin Hybrids

采用哈克旋转流变仪对聚二甲基硅氧烷(PDMS)和苯基MDQ/PDMS杂化体系的流变性能进行研究,结果表明,在低剪切速率,PDMS和苯基MDQ/PDMS杂化体系均表现出牛顿流体行为,当剪切速率增加至某临界值γc时,PDMS和苯基MDQ/PDMS杂化体系均表现出剪切变稀现象;增加苯基MDQ硅树脂含量会导致γc值减小,升高温度则使γc值增大;PDMS和苯基MDQ/PDMS杂化体系的黏度与温度之间的关系可用Arrhenius方程进行描述,计算结果显示,与PDMS相比,杂化体系具有更高的流动活化能。

The rheological properties of polydimethylsiloxane(PDMS)/phenyl-substituted MDQ silicon resin hybrids and PDMS were analyzed by Haake rheometer. The results show that,Newtonian behavior can be observed in both PDMS and PDMS/phenyl-substituted MDQ silicon resin hybrids at low shear rate. However,shear thinning behavior is observed in all samples when the shear rate reaches a critical value γc. The γcvalues decrease when increasing the content of phenyl-substituted MDQ silicon resins and increases along with the raising temperature. The relation of temperature and viscosity can be evaluated using the Arrhenius model. Meanwhile,calculation results indicate that hybrids reprent higher activation energy than PDMS.