硫化温度对硅橡胶发泡硫化动力学及性能的影响

Effect of cure temperature on kinetics and physical properties of silicone rubber foam

采用动力学方程自催化模型Sestak-Berggren以及Arrhenius方程研究了模压过程中交联以及发泡的活化能,并结合扫描电镜(SEM)照片研究了不同硫化温度条件下发泡试样的力学性能及静压缩条件下的载荷保持率。实验结果表明,硫化过程的活化能大于发泡过程,即温度对硫化过程的影响程度较为明显。硫化温度对发泡材料的泡孔结构有很大的影响,温度越高,发泡倍率越大,其泡孔也越加均匀紧密。静态压缩条件下,硫化温度越高,试样内部的载荷保持率下降速度越快,强度也越低。

The work studied the activation energy of vulcanization and foaming by the autocatatys- tic model equation of Sestak-Berggren and Arrhenius equation, and studied the mechanical properties and loading retention factor of different temperature by SEM. The parameters indicated the activation energy of vulcanization was higher than foaming. In the moulding foaming process, the effect of tem- perature on vulcanization was more obvious. SEM indicated that cure temperature had great effects on cell structure. The higher the temperature was,the greater the foaming rate was, and the cell made even closer. In the static compression testing, the higher the temperature was, the faster the loading re- tention factor dropped