聚二甲基硅烷分温度段热裂解产物结构表征  

Structure Characterizations of Pyrolyzed Products from Polydimethylsilane at Different Temperatures

作　　者：杨景明[1] 余煜玺[1] 程璇[1] 张颖[1] 郭亚涤[1] 

机构地区：[1]厦门大学材料学院材料科学与工程系、厦门大学特种先进材料实验室,福建厦门361005

出　　处：《高分子材料科学与工程》2009年第5期107-110,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(50532010);国家博士后科学基金资助项目(20060390704)

摘　　要：将一定量的聚二甲基硅烷置于烧瓶中进行热裂解,从室温升温至420℃,采用自制馏分收集装置分别收集320℃～330℃,330℃～360℃,360℃～390℃,390℃～420℃,420℃五个温度段的液态馏分,同时收集裂解烧瓶中的融熔部分。采用傅立叶变换红外光谱(FT-IR)和核磁共振波谱(NMR)技术对上述五种馏分和融熔样品分别进行了结构分析与比较,通过液态凝胶色谱(GPC)测量了各馏分的相对分子量及其多分散系数,发现聚二甲基硅烷在320℃左右开始大量裂解重排,不同温度段馏分的结构和分子量存在着差异。In order to study the structure of pyrolyzed products from polydimethylsilane （PDMS） , 160g PDMS was heated in a flask from room temperature to 420 12, the liquid fractions were collected using home-made apparatus during the pyrolysis at five selected temperature regions： 320 12 --330 12, 330 12 --360 12, 360 12 --390 12, 390 12--420 ℃, and 420 ℃. The melted residues in the flask were also collected. FT-IR and NMR techniques were used to characterize the structures of the fractions and melts; GPC was used to obtain their molecular weights and polydispersity coefficients. It was found that PDMS started decomposing and rearrangement largely at 320 12. The structures and molecular weights of the fractions pyrolyzed at different temperature regions varied considerably. These results can be used to direct the synthesis of polycarbosilane.

关 键 词：聚二甲基硅烷 热裂解 红外光谱 核磁共振波谱 

分 类 号：O631.31[理学—高分子化学]