以聚二甲基硅烷(PDMS)为原料,在高压釜内反应制备了聚碳硅烷(PCS)先驱体,并以软化点、元素分析、IR、GPC、NMR、TG-DTG-DTA、XRD等方法对其组成、结构及性能进行了表征,推测了PCS的大致结构模型.研究表明:PCS数均分子量约1590,实验式为SiC1.87H7.13O0.03,PCS分子包含Si-CH3、Si-CH2-Si、Si-H组成的SiC4、SiC3H等结构单元,由NMR知其C-H/Si-H值为8.84,SiC3H/SiC4为0.51.热分析表明,在N2气氛中1 200℃裂解后,陶瓷收率为78.9%.XRD分析表明,在N2中1 250℃裂解后转化为β-SiC,晶粒尺寸约3.75 nn.
参考文献
| [1] | Birot M;Pillot J P;Dunogues J .Comprehensive Chemistry of Polycarbosilanes, Polysilazanes, and Polycarbosilazanes as Precursors of Ceramics[J].Chemical Reviews,1995,95:1443-1477. |
| [2] | YAJIMA S;Hasegawa Y;Hayashi J .Synthesis of continuous silicon carbide fiber with high tensile strength and high Young' s modulus Part I[J].Synthesis of polycarbosilane as precursor JMaterSci,1978,13:2569-2576. |
| [3] | 宋永才,王岭,冯春祥.聚碳硅烷的合成与特性研究[J].高分子材料科学与工程,1997(04):30-33. |
| [4] | Hasegawa Y;Okamura K .Synthesis of continuous silicon carbide fiber Part ⅣV The structure of polycarbosilane as precursor[J].Journal of Materials Science,1986,21:321-328. |
| [5] | 陆逸;李效东 .聚碳硅烷的结构鉴定[J].宇航材料工艺,1989,19(06):55-59. |
| [6] | Hasegawa Y;Iimura M;Yajima S .Synthesis of continuous silicon carbide fiber Part Ⅱ Conversion of polycarbosilane fiber into silicon carbide fibers[J].Journal of Materials Science,1980,15:720-728. |
| [7] | Hasegawa Y;Okamura K .Synthesis of continuous silicon carbide fiber Part Ⅲ Pyrolysis process of polycarbosilane and structure of the products[J].Journal of Materials Science,1983,18:3633-3648. |
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