Abstract
Polyaluminocarbosilane(PACS) was synthesized by reaction of polysilocarbonsilane(PSCS) with Al_(AcAc)_3,(AcAc:acetylacetonate) at normal pressure and high temperature,then PACS fibers were prepared through melt spinning of PACS.The composition and structure of PACS fibers were examined by measurements of element analysis,GPC,XPS,IR,()~(29)Si-Solid NMR and()~(27)Al-Solid NMR;the properties of PACS fibers were studied by TG,IR,weight gain and SEM.PACS synthesized through the reaction of Al(AcAc)_3 with PSCS by mass ratio of 6:100 was best fitting for preparing PACS fibers.Its empirical formula was SiC_(2.0)H_(7.5)O_(0.13)Al_(0.018) and the molecular weight was about 1700.The chemical structure unit included SiC_4,SiC_3H etc,and Si—O—Al bonds also existed in the PACS fibers.Under nitrogen atmosphere,the ceramic yield of PACS fibers was about 52%;during the curing process of PACS fibers in air,the Si—H bond reacted with oxygen,and Si—O—Si bond was formed.The ceramic yield of cured PACS fibers was about 80% and the properties of SiC(OAl) and SiC(Al) ceramic fibers were excellent.It was proved that PACS fibers were very fitting for making SiC(OAl) and SiC(Al) ceramic fibers.
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