凝胶渗透色谱-十八角激光散射仪测定聚硅氧烷的摩尔质量及其分布

摘要

The paper introduced a GPC-eighteen angle laser light scattering detector for measuring the molecular weight and molecular weight distribution of polysiloxanes.It also listed the experimental principle and experimental procedure.The results showed that the error of the weight-average molar mass of polysiloxanes was less than 0.5 ％,and the error of number average molar mass and molar mass distribution width index of polysiloxanes were less than 1％.The method was accurate and precise with the molar mass at around 100 000,and with good dispersity.It could be used as a routine method to determine polysiloxanes molecular weight and its distribution.%以四氢呋喃为流动相,采用凝胶渗透色谱-激光光散射法测定了聚硅氧烷的摩尔质量和摩尔质量分布,给出了该方法的实验原理、实验步骤.实验结果表明:在给定的测试条件下,聚硅氧烷的重均摩尔质量测定误差小于0.5％,数均摩尔质量和分布宽度指数误差均不大于1％,摩尔质量在10万g/mol左右,且分散度很好.该法的准确度和精密度较好,可作为常规测定聚硅氧烷摩尔质量及其分布的方法.