将聚碳硅烷(PCS)纤维在环己烯气氛中进行化学气相交联不熔化处理,其氧含量比空气不熔化处理大大降低,组成和结构也发生了变化,气体副产物中存在环己烷和小分子硅烷.在环己烯气氛中,随着温度的升高,PCS分子的Si-H键的反应程度逐渐提高,纤维的凝胶含量逐渐增大.环己烯受热引发PCS分子中的Si-H和Si-CH3键断裂生成Si自由基和Si-CH2自由基,促进PCS分子间形成Si-CH2-Si交联结构;同时,环己烷作为侧基引入到PCS分子结构中,使纤维的碳含量随之增高.随着反应温度的升高,部分环己烷侧基和少量小分子硅烷会从PCS分子主链脱出.
参考文献
| [1] | CHU Zengyong,SONG Yongcai,FENG Chunxiang,Advances in the polymer-derived continuous SiC fibers,Journal of Inorganic Materials,17(2),193(2002)(楚增勇,宋永才,冯春祥,先驱体转化法连续SiC纤维国内外研究与开发现状,无机材料学报,17(2),193(2002)) |
| [2] | CHENG Xiangzhen,XIAO Jiayu,XIE Zhengfang,Research on curing of polycarbosilane fiber and preparation of SiC fiber,Journal of Materials Engineering,1,29(2004)(程祥珍,肖加余,谢征芳,聚碳硅烷纤维的不熔化与SiC纤维制备研究,材料工程,1,29(2004)) |
| [3] | T.Shimoo,K.Okamura,Y.Morisada,Active-to-passive oxidation transition for polycarbosilane-derived silicon carbide fibers heated in Ar-O2 gas mixtures,J.Mater.Sci.,37,1793(2002) |
| [4] | M.Takeda,A.Urano,J.Sakamoto,Microstructure and oxidation behavior of silicon carbide fibers derived from polycarbosilane,J.Am.Ceram.Soc.,83(5),1171(2000) |
| [5] | T.Mah,N.L.Hecht,D.E.Mc.Cullum,Thermal stability of SiC fibers(nicalon),J.Mater.Sci.,19(4),1191(1984) |
| [6] | WANG Jun,FENG Chunxiang,SONG Yongcai,The oxidative stabilization of polycarbosilane fibers in air,Acta Chimica Sinica.,56(1),77(1998)(王军,冯春祥,宋永才,聚碳硅烷纤维的空气不熔化处理,化学学报,56(1),77(1998)) |
| [7] | H.Q.Ly,R.Taylor,R.J.Day,Conversion of polycarbosilane (PCS) to SiC-based ceramic.Part Ⅰ.Characterisation of PCS and curing products,J.Mater.Sci.,36,4037(2001) |
| [8] | S.Ochiaia,S.Kimurab,H.Tanakab,Degradation of SiC/SiC composite due to exposure at high temperatures in vacuum in comparison with that in air,Composites Part A-Applied Science and Manufacturing,35,33(2004) |
| [9] | C.Zengyong,S.Yongcai,Enhanced irradiation crosslinking of polycarbosilane,J.Mater.Sci.Lett.,18,1793(1999) |
| [10] | C.Zengyong,S.Yongcai,Different influence of EB irradiation on the structural behaviors of polycarbosilane and polysilazane fibers,J.Mater.Sci.Lett.,19,1771(2000) |
| [11] | A.Idesaki,M.Narisawa,K.Okamura,Application of electron beam curing for silicon carbide fiber synthesis from blend polymer of polycarbosilane and polyvinylsilane,Radiat.Phys.Chem.,60(4～5),483(2001) |
| [12] | T.William,D.B.Christopher,D.S.Michael,Polymerderived SiC fibers with low oxygen content and improved thermomechanical stability,Compos.Sci.Technol.,51,145(1994) |
| [13] | Y.Hasegawa,SiC fiber prepared from polycarbosilane cured without oxygen,J.Inorg.Organomet.Polym.,2(1),161(1992) |
| [14] | Y.Hasegawa,New curing method for polycarbosilane with unsaturated hydrocarbons and application to thermally stable SiC fiber,Compos.Sci.Technol.,51,161(1994) |
| [15] | SHENG Xiaoli,LI Fengyi,YANG Jian,Study of the catalytic hydrosilylation of cyclohexyl-containing organosilicon,Journal of Nanchang University,24(2),131(2000)(盛晓莉,李凤仪,杨健,环状和链状烯烃的硅氢加成研究,南昌大学学报,24(2),131(2000)) |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%