Abstract The structure and composition of polycarbonate polydimethylsiloxane copolymer (PC-co-PDMS) was investigated by applying various analytical approaches including chromatographic separation methods, spectrometric, and spectroscopic detection techniques. In particular, size exclusion chromatography (SEC) and liquid adsorption chromatography operating at different conditions (e.g. using gradient solvent systems) were used to achieve separations according to molar mass and functionality distribution. The coupling of both techniques resulted in fingerprint two-dimensional plots, which could be used to easily compare different copolymer batches. Matrix-assisted laser desorption/ionization-time-of-flight (MALDI-TOF) mass spectrometry was applied for structural investigations. The different ionization behavior of both comonomers, however, strongly limited the applicability of this technique. In contrast to that, Fourier-transform Infrared (FTIR) spectroscopy could be used to quantify the amount of PDMS in the copolymer at different points in the chromatogram. The resulting methodology was capable of distinguishing PC-co-PDMS copolymer from PC homopolymer chains present in the material.

中文翻译：

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通过二维色谱分离、MALDI-TOF 质谱和 FTIR 光谱表征聚碳酸酯和聚二甲基硅氧烷的共聚物

摘要 采用色谱分离法、光谱法和光谱检测技术等多种分析方法研究了聚碳酸酯聚二甲基硅氧烷共聚物（PC-co-PDMS）的结构和组成。具体而言，使用在不同条件（例如使用梯度溶剂系统）下操作的尺寸排阻色谱（SEC）和液体吸附色谱来实现根据摩尔质量和官能度分布的分离。两种技术的结合产生了指纹二维图，可用于轻松比较不同的共聚物批次。基质辅助激光解吸/电离飞行时间 (MALDI-TOF) 质谱法用于结构研究。然而，两种共聚单体的不同电离行为，严重限制了该技术的适用性。与此相反，傅里叶变换红外 (FTIR) 光谱可用于量化色谱图中不同点的共聚物中 PDMS 的量。所得方法能够将 PC-co-PDMS 共聚物与材料中存在的 PC 均聚物链区分开来。