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Karstedt催化剂对聚硅氧烷/PC阻燃性能的影响

, PP. 42-49

Keywords: 阻燃,聚硅氧烷,聚碳酸酯(PC),Karstedt催化剂,复合材料

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Abstract:

采用水解缩合法制备了三官能结构的聚硅氧烷阻燃剂。采用氧指数仪、锥形量热仪、TGA、热裂解-气相色谱/质谱(PY-GC/MS)和SEM研究了Karstedt催化剂(KC)对聚硅氧烷/聚碳酸酯(PC)复合材料热性能和阻燃性能的影响,并研究了该复合体系的阻燃机制。结果表明:在热裂解过程中KC促进了含乙烯基聚硅氧烷的交联,增强了聚硅氧烷/PC复合材料的耐热性能;KC抑制了聚硅氧烷/PC复合材料在燃烧过程的热释放,使材料的烟、CO、CO2产生过程延后,且峰值降低,提高了聚硅氧烷/PC的阻燃性能,降低了材料燃烧的危害性。但KC对聚硅氧烷/PC复合材料的极限氧指数(LOI)的影响较复杂,其LOI不仅取决于残炭量,还与燃烧炭层结构有关,在保持一定残炭量下,若KC使聚硅氧烷/PC的燃烧炭层更致密、均匀,则材料的LOI提高。

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