摘要
直接法生产甲基氯硅烷的高沸点副产物分离出的甲基氯二硅烷(DS)与八甲基环四硅氮烷反应形成氯硅烷低聚物,经氨解成为聚硅氮烷(PSZ)前躯体,并发现PSZ甲苯溶液为假塑性流体,得到70%(质量)的PSZ甲苯溶液的粘流活化能为18.3kJ/mol。PSZ在1100℃高温裂解后,可得到无氯Si-C-N无定型陶瓷,认为该路线是制备高性能Si-C-N陶瓷的最经济的方法之一。
When methylchlorodisilanes(DS) were separated from high-boiling disilane residue, a by product of direct synthesis of methylchlorodisilanes, and reacted with octamethylcyclotetrasilazane(D~~N_4), a chlorosilazane oligomer was formed. After ammonolysis of the chlorosilazane, a polysilozane(PSZ) precursor was obtained. It has been discovered that the PSZ solutions in toluene are pseudo-plastic fluid and that the viscosity-flow activation energy for 70% PSZ solution in toluene is (18.3) kJ/mol. Pyrolysis of PSZ at 1100 ℃ in a nitrogen atmosphere yields an amorphous Si-C-N ceramic with negligible amount of chlolrine. Therefore. this process will be one of the most economical ways to produce high performance Si-C-N ceramic.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2004年第1期187-190,共4页
Polymer Materials Science & Engineering
关键词
Si-C-N陶瓷
高沸物二硅烷
甲基氯二硅烷
聚硅氮烷
流变特性
高温裂解
high-boiling disilane residue
methylchlorodisilane
cyclosilazane
ammonolysis
polysilazane precursor
viscosity-flow activation energy
pyrolysis
Si-C-N ceramic
