摘要
通过研究聚硅氧烷 (PSO)与二乙烯基苯 (DVB)的交联与裂解发现 ,只有在氯铂酸的催化下 ,PSO与DVB才能完全交联固化。催化剂含量为 11 31ppm、质量比为 1:0 5的PSO DVB体系在 12 0℃下交联 6小时后 ,其陶瓷产率为 76 %。该体系的室温粘度为 10 5mPa·s,与碳纤维 (Cf)的接触角为 34° ,非常适合制备三维纤维编织物增强的陶瓷基复合材料。XRD测试表明 ,在 10 0 0℃下裂解的产物中出现SiO2 微晶 ,12 0 0℃时出现 β -SiC微晶 ,温度再升高 ,两种晶粒明显长大。 10 0 0℃裂解产物中Si、O、C三种原子的含量分别为 38 33wt %、 2 7 33wt %、 34 34wt% ,其中C大部分以自由碳形式存在 ,其余部分与Si、O无序混合 ,形成 [Si (O ,C) 4]结构。这种结构在 12 0 0℃以上转变为 [SiO4]和
The cross-linking and pyrolysis of Polysiloxane (PSO)/Divinylbenzene (DVB) is investigated in this paper It is found that only catalyzed with H 2PtCl 6 PSO/DVB can cure completely When cured at 120℃ for 6hrs with H2PtCl6, the ceramic yield of PSO/DVB, the mass ratio of which is 1∶0 5, is 76% The viscosity at room temperature of PSO/DVB and the contact angle between PSO/DVB and carbon fiber are 10 5 mPa·s and 34 degree, which make PSO/DVB very good for the preparation of three-dimension-braided fiber reinforced ceramic matrix composites. The XRD results indicate that there are SiO 2 and β-SiC microcrystals in the product pyrolyzed at 1000℃ and 1200℃, which grow markedly above 1200℃. The content of Si, O, C in the product pyrolyzed at 1000℃ is 38 33wt%, 27 33wt%, and 34 34wt%, respectively. Most C existed as free carbon , and the rest randomly mixed with Si, O to form [Si(O,C) 4] which are converted is to and above 1200℃.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2001年第5期40-44,共5页
Journal of National University of Defense Technology
