聚碳硅烷的分子量和流体力学特性表征  

Molecular Mass Characteristic and Hydrodynamic Properties of Polycarbosilane

作　　者：蒋丽琴 刘亮[1] 白明慧 胡胜泊[1] JIANG Liqin;LIU Liang;BAI Minghui;HU Shengbo(Aerospace Research Institute of Material&Processing Technology,Beijing 100076)

机构地区：[1]航天材料及工艺研究所,北京100076

出　　处：《宇航材料工艺》2020年第6期82-84,共3页Aerospace Materials & Technology

摘　　要：通过研究聚碳硅烷溶液的流体力学参数与分子量的关系以及比浓黏度与浓度的关系,得到了聚碳硅烷的分子结构信息。结果表明,聚碳硅烷绝对重均分子量Mw为1.098×10^4 g/mol,分子量分布MWD为6.7,第二维利系数A2为1.57×10^-3 cm^3·mol/g2,Huggins常数k’为1.85,流体力学半径与分子量间的标度指数b为0.21。在室温条件下,良溶剂四氢呋喃稀溶液中,聚碳硅烷链段空间分布较为紧密,分子链为非线型结构。In order to obtain the molecular structure,the of polycarbosilanes relationship between molecular hydrodynamics and molecular mass and the concentration dependence of reduced viscosity have been investigated.The results indicated that for PCS,absolute weight-average molecular mass Mw=1.098×10^4 g/mol,molecular weight distribution MWD=6.7,the second virial coefficient A2=1.57×10^-3 cm^3·mol/g2,Huggins constant k’=1.85,the scaling exponent b between hydrodynamic radius and molecular mass=0.21.At normal atmospheric temperature,tetrahydrofuran(THF)is a thermodynamically good solvent for PCS.And PCS macromolecules are characterized by compact structure which is not in according with the characteristics of linear polymers.

关 键 词：聚碳硅烷 多角度激光光散射 流体力学参数 分子量 

分 类 号：TQ174.1[化学工程—陶瓷工业]