研究了一种新型氮化硼先驱体——聚烷胺基环硼氮烷（PPAB）在空气中的水解过程,利用FT-IR、TGA、XRD和EDX考察了水解对PPAB及其在氩气中裂解产物结构和组成的影响。结果表明PPAB在空气中极易水解,其分子结构中的B—N键易水解形成B—O键,水解程度随放置时间及温度的增加而加快。水解前后的PPAB在1000℃时的陶瓷产率分别为45.9%和56.4%。水解后的先驱体在Ar中的裂解产物中含有较多B2O3,而未水解的PPAB裂解产物中B、N原子比接近化学计量比,不含B2O3。
Hydrolysis of a novel poly（alkylaminoborazine）（PPAB） to boron nitride in air and its effect on PPAB＇s pyrolysis product in Ar were investigated by using FT-IR,TGA,XRD and EDX.The results show that B—N units in PPAB were sensitive to vapor in air and B—O bonds formed during hydrolysis.Hydrolysis accelerated with increasing temperature and time.The ceramic yields of PPAB before and after hydrolysis were 45.9% and 56.4% at 1000℃ in Ar,respectively.In addition,pyrolytic residue of hydrolyzed PPAB in Ar was a mixture of BN and B2O3.While products obtained from PPAB is BN in which B/N was nearly stoichiometric without B2O3.
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