凝胶渗透色谱-激光光散射法测定甲基-乙烯基-苯基硅橡胶相对分子质量及其分布

采用凝胶渗透色谱（GPC）-激光光散射（LLS）联用测定甲基-乙烯基-苯基硅橡胶（MPVQ）相对分子质量及其分布。确定测定条件如下：溶剂　甲苯，测试温度　25 ℃，流速　1 mL·min^-1，试样溶液质量浓度　4 mg·mL^-1，进样量　50 μL，测定MPVQ的折光指数增量(dn/dc为（0.058 9±0.002 5） mL·g^-1；MPVQ数均相对分子质量和重均相对分子质量测定的相对标准偏差分别为3.97%和1.52%，GPC-LLS法具有较高的准确度和精密度。;The molecular weight and its distribution of polymethylphenyl-vinyl silicone rubber（MPVQ）were determined by gel permeation chromatography（GPC）-laser light scattering（LLS） method. The testing conditions were as follows：solvent　toluene，test temperature　25 ℃，flow speed　1 mL·min^-1，sample solution mass concentration　4 mg·mL^-1，injection volume　50 μL，and the dn/dc value of MPVQ was （0.058 9±0.002 5） mL·g^-1.The relative standard deviations of the number average molecular weight and weight average molecular weight were 3.97% and 1.52%，respectively. This study showed that GPC-LLS method had high accuracy and precision