SummaryThis paper deals with the characterization of styrene-butadiene-styrene (SBS) block copolymers at molecular level through different techniques. SBS molecular weight distributions (MWD) were measured by Gel Permeation chromatography (GPC) in tetrahydrofuran (THF) solvent and using a calibration curve based on mono-dispersed polystyrene standards; afterwards, the relative molecular weights obtained by GPC were adjusted using a correction factor based on Mark-Houwink-Sakurada parameters for SBS in THF. Quantitative characterization of polybutadiene (PB) structures in SBS was made by solid-state 13C Nuclear Magnetic Resonance (NMR). A novel method using Fourier transform infrared spectroscopy (FTIR) has been developed for characterizing the SBS composition. This method covers the determination of composition in SBS ranging from 20 to 75 wt% of polybutadiene (PB) and was performed based on a FTIR calibration curve, which was prepared using mixtures of polystyrene (PS) and polybutadiene (PB) of known compositions.

中文翻译：

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通过 GPC、NMR 和 FTIR 对苯乙烯-丁二烯-苯乙烯嵌段共聚物 (SBS) 进行分子表征

总结本文通过不同的技术在分子水平上对苯乙烯-丁二烯-苯乙烯 (SBS) 嵌段共聚物进行表征。SBS 分子量分布 (MWD) 通过凝胶渗透色谱 (GPC) 在四氢呋喃 (THF) 溶剂中测量并使用基于单分散聚苯乙烯标准的校准曲线；然后，使用基于 Mark-Houwink-Sakurada 参数的校正因子对 GPC 获得的相对分子量进行调整，用于 THF 中的 SBS。SBS 中聚丁二烯 (PB) 结构的定量表征是通过固态 13C 核磁共振 (NMR) 进行的。已经开发了一种使用傅里叶变换红外光谱 (FTIR) 的新方法来表征 SBS 组成。