硅烷偶联剂总硫含量与平均硫链长度的测试

研究固体和液体偶联剂Si69总硫含量与平均硫链长度的测试方法。采用元素分析仪,以管式炉燃烧-红外吸收法测试偶联剂Si69的总硫含量;用质量分数为0.04%的四丁基溴化铵/乙醇/甲醇溶液(体积比为18/45/137)作为流动相,C₁₈柱分离,等度洗脱的方式,采用高效液相色谱仪测试偶联剂Si69的平均硫链长度。结果显示:固体偶联剂Si69试样的总硫含量为11.512%,平均硫链长度为3.59;液体偶联剂Si69试样的总硫含量为21.924%,平均硫链长度为3.60;固体偶联剂Si69总硫含量的测试精密度比液体偶联剂Si69高。

Determination of Total Sulfur Content and Average Sulfur Chain Length of Silane Coupling Agent

The determination of the total sulfur content and average sulfur chain length of solid and liquid silane coupling agent Si69 was studied.The total sulfur content of coupling agent Si69 was measured by tube furnace combustion-infrared absorption method with elemental analyzer.The average sulfur chain length of the coupling agent Si69 was measured by high performance liquid chromatography(HPLC)using C₁₈column separation and isometric elution method,and using tetrabutylammonium bromide with a mass fraction of 0.04%/ethanol/methanol solution as the mobile phase(tetrabutylammonium bromide/ethanol/methanol volume ratio was 18/45/137).The results showed that the total sulfur content of the solid coupling agent Si69 sample was 11.512%,and the average sulfur chain length was 3.59.The total sulfur content of the liquid coupling agent Si69 sample was 21.924%,and the average sulfur chain length was 3.60.The determination precision of the total sulfur content of solid coupling agent Si69 was higher than that of liquid coupling agent Si69.