HTPB窄分布标准物质制备和相对分子质量及其分布测定  

Preparation methods of narrow distribution HTPB standards and determination of molecular weight and distribution of HTPB standards

作　　者：谭利敏[1] 黄志萍[1] 胡伟[1] 徐娜[1] 曹庆伟[1] 王敏[1] 

机构地区：[1]中国航天科技集团公司四院四十二所,襄阳441003

出　　处：《固体火箭技术》2015年第6期893-896,共4页Journal of Solid Rocket Technology

摘　　要：采用沉淀分级方法,以四氢呋喃作为溶剂、甲醇作为沉淀剂,将自由基聚合的宽分布HTPB样品制备成5个窄分布的标样。采用GPC-MALLS法,测定了HTPB标样的相对分子质量及其分布。实验结果表明,HTPB标样色谱峰峰形对称,峰窄,相对分子量分布均匀,分散指数D<1.3。与VPO法测定结果对照,数均相对分子量相对偏差<10%。以窄分布HTPB作为标样,采用GPC法测定了HTPB相对分子质量及其分布,获得的数均、重均相对分子质量及分散指数与GPCMALLS法结果基本一致,相对偏差<10%;数均相对分子质量与VPO法相对偏差<12%。Through methanol precipitation, the broad distribution HTPB of free radical polymerization was graded into five nar- row distribution standard samples. The molecular weight and molecular weight distribution of HTPB standard samples were determi- nated by gel permeation chromatography-laser light scatting（GPC-MALLS）. The experimental results show that the peak shape of self-made HTPB standard sample is symmetrical and narrow, the molecular weight distribution is even, and the dispersion index D is less than 1.3. Compared with the results determinated by vapour pressure osmometry （VPO）, the relative error of number molecular weight is less than 10%. Using narrow distribution HTPB as standard samples of GPC ,the results by GPC are basically the same as the results by GPC-MALLS and the relative error is less than 10%. Compared with the results by VPO, the relative error is less than 12%.

关 键 词：端羟基聚丁二烯(HTPB) 沉淀分级 凝胶渗透色谱-激光光散射联用(GPC-MALLS) 凝胶渗透色谱(GPC) 蒸汽压渗透仪(VPO) 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]