文献类型：期刊文献

英文题名：Simultaneous determination of the styrene unit content and assessment of molecular weight of triblock copolymers in adhesives by a size exclusion chromatography method

作者：Wang, Mingfang[1];Wang, Yuerong[1];Luo, Pei[2];Zhang, Hongyang[1];Zhang, Min[3];Hu, Ping[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Macau Univ Sci & Technol, Macau Inst Appl Res Med & Hlth, State Key Lab Qual Res Chinese Med, Taipa, Macau, Peoples R China;[3]East China Univ Sci & Technol, Sch Pharm, Shanghai Key Lab New Drug Design & Modern Engn Ct, Shanghai, Peoples R China

年份：2017

卷号：40

期号：20

起止页码：3987

外文期刊名：JOURNAL OF SEPARATION SCIENCE

收录：;EI(收录号：20173704157761);WOS:【SCI-EXPANDED(收录号:WOS:000413567800008)】；

基金：This research was supported financially by the National Natural Science Foundation of China (No. 81573397). This is an open project of the State Key Laboratory of Quality Research in Chinese Medicine (Macau University of Science and Technology, MUST-SKL-2016-06) funded by the Macao Science and Technology Development Fund, Macau Special Administrative Region.

语种：英文

外文关键词：size exclusion chromatography; styrene-butadiene-styrene; styrene-isoprene-styrene; styrene unit content; triblock copolymers

摘要：The content of styrene units in nonhydrogenated and hydrogenated styrene-butadiene-styrene and styrene-isoprene-styrene triblock copolymers significantly influences product performance. A size exclusion chromatography method was developed to determine the average styrene content of triblock copolymers blended with tackifier in adhesives. A complete separation of the triblock copolymer from the other additives was realized with size exclusion chromatography. The peak area ratio of the UV and refraction index signals of the copolymers at the same effective elution volume was correlated to the average styrene unit content using nuclear magnetic resonance spectroscopy with commercial copolymers as standards. The obtained calibration curves showed good linearity for both the hydrogenated and nonhydrogenated styrene-butadiene-styrene and styrene-isoprene-styrene triblock copolymers (r = 0.974 for styrene contents of 19.3-46.3% for nonhydrogenated ones and r = 0.970 for the styrene contents of 23-58.2% for hydrogenated ones). For copolymer blends, the developed method provided more accurate average styrene unit contents than nuclear magnetic resonance spectroscopy provided. These results were validated using two known copolymer blends consisting of either styrene-isoprene-styrene or hydrogenated styrene-butadiene-styrene and a hydrocarbon tackifying resin as well as an unknown adhesive with styrene-butadiene-styrene and an aromatic tackifying resin. The methodology can be readily applied to styrene-containing polymers in blends such as poly(acrylonitrile-butadiene styrene).