混杂聚硼硅氮烷的交联过程分析及其工艺优化

合成了混杂聚硼硅氮烷(H-PBSZ)并对其结构进行了分析,分析了其交联过程,并采用不同的工艺使其交联固化,研究了交联压力对产物的结构、形貌以及表观密度的影响。结果表明,H-PBSZ结构中含有B-N、Si-N、B-H、N-H以及Si-H等化学键,随着温度的升高,B-H、N-H以及Si-H键会发生断裂;交联过程中,先驱体会放出大量的气体,交联产物的致密度受气泡大小及其速度的影响;高压交联可以减小所放出的气泡的体积,减缓其上升的速度,并可抑制含氢键的断裂反应,降低气体的放出量,从而制得较高致密度的交联产物。

Investigation and Optimization in the Curing Process of Hybrid Polyborosilazane

Hybrid polyborosilazane(H-PBSZ) was synthesized and characterized.Meanwhile,the curing process of H-PBSZ was analyzed,and HPBSZ was cured through different processes.Furthermore,the effects of curing pressure on the structure,appearance and apparent density of cured product were investigated.The results show that chemical bonds of B-N,Si-N,B-H,N-H,and Si-H exist in the structure of H-PBSZ.With the increase of temperature,bonds of B-H,N-H,and Si-H will be broken.Large amounts of gases emit from the precursor in the curing process.The density of the cured product is determined by the volume and velocity of the bubbles.The high pressure curing process can reduce the volume of bubbles,decrease their climbing velocity,and restrain the breaking of the bonds containing H atoms,decrease the amount of gases emission in the process.Therefore,much denser cured product is obtained.