用不同分子量聚碳硅烷制备含铝聚碳硅烷

Preparation of Polyaluminocarbosilane from Different Molecular Masses of Polycarbosilane

分别选用分子量Mn为929、1050、1186的聚碳硅烷(polycarbosilane,PCS)与乙酰丙酮铝反应制备含铝聚碳硅烷(polyaluminocarbosilanes,PACS),研究PCS分子量对PACS性能及结构的影响。结果表明:随着PCS分子量的增加,PACS分子量逐渐增加,分布加宽,而活性基团Si—H键含量没有明显变化;随着PCS分子量增加,PACS陶瓷产率增加。将不同的PACS进行热交联,其陶瓷产率明显提升,增长幅度随PCS分子量增大而增大。PACS的纺丝性能随PCS分子量增大而降低。

In order to investigate the influence of the molecular mass of polycarbosilane （PCS） on the polyaluminocarbosilanes （PACS）, the PACS was synthesized by the PCS with different molecular masses （M,） （i.e., Mn： 929, 1 050 and 1 186）. The results in- dicate that the magnitude and the distribution width of the molecular mass of PACS both increase with the increase of the molecular mass of PCS. The amount of Si--H bond of PACS show little variation with the increase of the molecular mass of PCS, but the ce- ramic yield of PACS exhibited an increase. The ceramic yield of PACS was increased via thermal crosslinking of different PACSs, and the growth degree was increased due to the increase of the molecular mass of PCS. The spinning property of PACS decreased with the increase of molecular mass of PCS.