硅氮化合物的结构与水解稳定性的关系

采用硅氮化合物本体与水蒸汽直接作用的方法,研究了一系列硅氮化合物的结构与水解稳定性之间的关系.结果表明,空间位阻越大则硅氮化合物水解稳定性越好,环张力对硅氮烷的水解稳定性有一定的影响,但空间位阻的作用更为显著.带有苯基的环二硅氮烷、六苯基环三硅氮烷和含硅氮键的高分子聚合物具有较大的空间位阻,因此水解稳定性非常好.

Relationships Between Structures and Hydrolytic Stability of Silazane Compounds

Relationships between structures of a series of silazane compounds and their hydrolytic stability were investigated by contacting silazane compounds directly with water vapor. It was indicated that steric hindrance of substituents strongly influenced hydrolytic stability of silazane compounds. Compounds with bigger substituents had better hydrolytic stability. As for cyclosilazanes, hydrolytic stability was also dependent on ring strength. However, steric hindrance played more dominant roles. Cyclosilazanes with phenyl substituents, hexaphenylcyclotrisilazane and polymeric compounds containing Si-N bond were of excellent hydrolytic stability due to high steric hindrance.