SiBNC陶瓷纤维前驱体-聚硅硼氮烷的合成与表征?  

Synthesis and characterization of polyborosilazane for SiBNC ceramic fiber preparation

作　　者：彭帅[1] 刘勇[1] 崔永杰[1] 张晨宇[1] 常雪峰[1] 韩克清[1] 余木火[1] PENG Shuai;LIU Yong;CUI Yong-jie;ZHANG Chen-yu;CHANG Xue-feng;HAN Ke-qing;YU Mu-huo(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of MaterialsScience and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]纤维材料改性国家重点实验室东华大学材料科学与工程学院,上海201620

出　　处：《高校化学工程学报》2019年第2期483-488,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金青年基金(51703025);上海市自然科学基金(15ZR1400400)

摘　　要：以四氯化硅、三氯化硼、甲胺为原料,使用共缩聚方法制备了SiBNC陶瓷纤维前驱体聚硅硼氮烷。采用FT-IR、NMR、GC-MS和TG分析等,对聚硅硼氮烷的结构、性能和合成机理进行了表征和分析。研究表明该聚硅硼氮烷前驱体的骨架结构由Si-N-B和B-N六元环结构组成,C则主要以N-CH_3和NH-CH_3结构存在。合成得到的前驱体具有良好的溶解性、耐水解性能和可纺性,在105℃的N_2气氛下,经熔融纺丝可得直径约为25μm的前驱体原丝,在N_2气氛中1 000℃时陶瓷产率为60%。Polyborosilazane (PBSZ) was synthesized using tetrachlorosilane (SiCl4), boron trichloride (BCl3) and methylamine (CH3NH2) via polycondensation for the preparation of SiBNC ceramic fiber. Chemical structures, properties and synthesis mechanism of PBSZ were investigated by FT-IR, NMR, TG and GC-MS. The results indicate that the backbone structure of PBSZ is composed of Si-N-B bonds and borazine ring, and C is existed in forms of N-CH3 in Si-N-B and NH-CH3 in end groups. PBSZ green fibers with diameter of ~25 μm could be obtained by melt spinning at 105 ℃ in N2 atmosphere. The obtained PBSZ has good solubility, hydrolysis resistance, spinnability and high ceramic yield (60%, 100 0 ℃ in N2 atmosphere), which has good potential for SiBNC ceramic fiber fabrication.

关 键 词：前驱体转化法 聚硅硼氮烷 高温陶瓷 SiBNC陶瓷纤维 

分 类 号：TQ174.1[化学工程—陶瓷工业]