| 引用本文: | 马青松,陈朝辉,郑文伟,等.聚硅氧烷/二乙烯基苯的交联与裂解.[J].国防科技大学学报,2001,23(5):40-44.[点击复制] |
| MA Qingsong,CHEN Zhaohui,ZHENG Wenwei,et al.Cross-linking and Pyrolysis of Polysiloxane/Divinylbenzene[J].Journal of National University of Defense Technology,2001,23(5):40-44[点击复制] |
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| 聚硅氧烷/二乙烯基苯的交联与裂解 |
| 马青松, 陈朝辉, 郑文伟, 胡海峰 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 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120℃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1000℃下裂解的产物中出现SiO2微晶，1200℃时出现β－SiC微晶，温度再升高，两种晶粒明显长大。1000℃裂解产物中Si、O、C三种原子的含量分别为38.33wt%、27.33wt%、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1200℃以上转变为［SiO4］和［SiC4］结构。 |
| 关键词: 聚硅氧烷 二乙烯基苯 交联 裂解 |
| DOI： |
| 投稿日期：2001-06-20 |
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| Cross-linking and Pyrolysis of Polysiloxane/Divinylbenzene |
| MA Qingsong, CHEN Zhaohui, ZHENG Wenwei, HU Haifeng |
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(College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| The cross-linking and pyrolysis of Polysiloxane (PSO)/Divinylbenzene (DVB) is investigated in this paper. It is found that only catalyzed with H2PtCl6 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 SiO2 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［SiO4］and［SiC4］above 1200℃. |
| Keywords: polysiloxane(PSO) divinylbenzene(DVB) cross-linking pyrolysis |
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