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Polyurethane hard domain composed of mixed hard segments
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-02-01 , DOI: 10.1002/app.55261 Zhihong Wang 1, 2 , Lixia Li 2, 3 , Kai Yang 2 , Dongqi Wang 2 , Xin Zhao 2 , Sisi Cheng 2 , Meishan Fu 2 , Lijing Han 2 , Ruoyu Zhang 2
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-02-01 , DOI: 10.1002/app.55261 Zhihong Wang 1, 2 , Lixia Li 2, 3 , Kai Yang 2 , Dongqi Wang 2 , Xin Zhao 2 , Sisi Cheng 2 , Meishan Fu 2 , Lijing Han 2 , Ruoyu Zhang 2
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The packing of hard segment in polyurethane hard domain has not been resolved or seen clearly yet. In this work, we prepared polyurethane blends, which were composed of different weight ratios of crystallizable 1195A and non-crystallizable EG85A, to study the structural evolution and crystallization in mixed hard domain. Time and temperature dependent differential scanning calorimetry, Fourier transform infrared spectroscopy (FTIR), and x-ray diffraction results were used to record the micro-phase evolution and crystallization processes. It was very surprising to find that the multiple melting temperatures in these blends were similar. We deduced that the packing of hard segment tended to separate into different groups, probably dependent on their segmental length. The crystalline nucleus was consist of 1195A hard segments with similar length, and the out-layer structure was consisted of mixed hard segments of varying lengths. The FTIR results demonstrated that crystallinity did not affect the degree of hydrogen bonding association (HBA), and the stacking of hard segments may be only differed in the degree of ordering. Moreover, the degree of HBA of the blends was always higher than the calculated number based on weight ratio of pure samples.
中文翻译：
由混合硬段组成的聚氨酯硬域
硬段在聚氨酯硬域中的堆积尚未得到解决或清楚地看到。在这项工作中，我们制备了由不同重量比的可结晶1195A和不可结晶EG85A组成的聚氨酯共混物，以研究混合硬域中的结构演变和结晶。使用随时间和温度变化的差示扫描量热法、傅里叶变换红外光谱 (FTIR) 和 X 射线衍射结果来记录微相演化和结晶过程。非常令人惊讶地发现这些共混物中的多个熔化温度是相似的。我们推断硬段的堆积倾向于分成不同的组，这可能取决于它们的段长度。晶核由长度相似的1195A硬段组成，外层结构由不同长度的混合硬段组成。FTIR结果表明，结晶度不影响氢键缔合程度（HBA），硬链段的堆叠可能仅在有序程度上有所不同。此外，共混物的HBA含量始终高于根据纯样品的重量比计算的数值。
更新日期：2024-02-01
中文翻译：
由混合硬段组成的聚氨酯硬域
硬段在聚氨酯硬域中的堆积尚未得到解决或清楚地看到。在这项工作中，我们制备了由不同重量比的可结晶1195A和不可结晶EG85A组成的聚氨酯共混物，以研究混合硬域中的结构演变和结晶。使用随时间和温度变化的差示扫描量热法、傅里叶变换红外光谱 (FTIR) 和 X 射线衍射结果来记录微相演化和结晶过程。非常令人惊讶地发现这些共混物中的多个熔化温度是相似的。我们推断硬段的堆积倾向于分成不同的组，这可能取决于它们的段长度。晶核由长度相似的1195A硬段组成，外层结构由不同长度的混合硬段组成。FTIR结果表明，结晶度不影响氢键缔合程度（HBA），硬链段的堆叠可能仅在有序程度上有所不同。此外，共混物的HBA含量始终高于根据纯样品的重量比计算的数值。
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