Abstract Degradations of polyester (-COO-) and polyether (-O-) polyurethane (PU) samples in KOH aqueous solution were examined by microscopic infrared (IR) spectroscopy coupled with two-dimensional (2D) correlation analysis. The PU sample were subjected to degradation treatment in the KOH aqueous solution. Sets of IR spectra were collected as a function of distance under varying the distance to the sample surface where the degradation predominantly occurs. The spatial changes in the IR spectra were sorted out by 2D correlation spectroscopy. Namely, the hydrolysis of the polyester and polyether PU initially occurs in hard segment by dissociating weak intermolecular hydrogen bonding between the urethane groups of adjacent PU chains. Further degradation eventually induces the hydrolysis of C=O groups present in the soft segment domain.

中文翻译：

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通过二维 (2D) 红外 (IR) 相关光谱研究溶剂诱导的聚氨酯降解

摘要 通过显微红外 (IR) 光谱结合二维 (2D) 相关分析，研究了聚酯 (-COO-) 和聚醚 (-O-) 聚氨酯 (PU) 样品在 KOH 水溶液中的降解情况。PU样品在KOH水溶液中进行降解处理。在改变到主要发生降解的样品表面的距离下，作为距离的函数收集红外光谱组。红外光谱的空间变化通过二维相关光谱进行分类。即，聚酯和聚醚 PU 的水解最初发生在硬链段，通过解离相邻 PU 链的氨基甲酸酯基团之间的弱分子间氢键。进一步的降解最终会导致软段域中存在的 C=O 基团水解。