Abstract:

A cross-linked waterborne polyurethane solid-solid phase change material (WPUPCM) was prepared with polyethylene glycol 2000 (PEG2000) as the soft segment, isophorone diisocyanate (IPDI) as the hard segment, and glycerol (GL) as the chain extender. Firstly, the effects of monomer molar ratio and soft segment content on thermal storage performance and phase transformation morphology of WPUPCM were discussed. Then, the chemical structure, microstructure, crystallization performance, thermal stability and cycle stability of the prepared WPUPCM were tested and analyzed by infrared spectrometer, atomic force microscope, polarizing microscope-heat table system, thermogravimetric analyzer and differential scanning calorimetry. Finally, the temperature regulation performance of heat storage and temperature regulation textiles after WPUPCM treatment was discussed. The results indicated that the monomer molar ratio and soft segment content had a great influence on the heat storage performance and phase transformation morphology of WPUPCM. Reducing the soft segment content and increasing the proportion of chain extender were conducive to the reduction of the melting temperature of WPUPCM. When the monomer molar ratio of PEG, IPDI and GL was 1∶1.8∶0.5, the melting temperature of the prepared WPUPCM was 35.52℃ with a high melting enthalpy of 89.75J/g, which can well satisfy its application requirements in the textile and clothing field. Compared with pure PEG, the prepared WPUPCM had a homogeneous nucleation crystallization mechanism. Due to the constraint of the hard segment, the crystallization rate of WPUPCM slowed down, the size of the spherulites became smaller, and the stability of the spherulites was improved. The study also showed that the prepared WPUPCM had good thermal stability, cycle stability and good temperature regulation performance.

Key words: emulsions, solid-solid phase change material, waterborne polyurethane, phase change, crystallization, cross-linked

摘要：

以聚乙二醇2000（PEG2000）为软段，异佛尔酮二异氰酸酯（IPDI）为硬段，丙三醇（GL）为扩链剂，制备了一种交联高分子水性聚氨酯固-固相变材料（WPUPCM）。首先，探讨了单体摩尔比、软段含量对WPUPCM储热性能和相变形态的影响；然后，利用红外光谱仪、原子力显微镜、偏光显微镜-热台系统、热重分析仪和差示扫描量热仪对所制备WPUPCM的化学结构、微观结构、结晶性能、热稳定性和循环稳定性做了测试和分析；最后，探讨了经WPUPCM处理后的蓄热调温纺织品的调温性能。结果表明，单体摩尔比和软段含量对WPUPCM的储热性能和相变形态有很大影响，减少软段含量和增加扩链剂的比例均有利于WPUPCM熔融温度的降低，当PEG、IPDI、GL的单体摩尔比为1∶1.8∶0.5时，所制备WPUPCM的熔融温度为35.52℃，并具有较高的熔融热焓（89.75J/g），可以较好地满足其在纺织服装领域的应用需求。所制备的WPUPCM与纯PEG相比，结晶机理均为均相成核结晶，由于硬段的束缚使得WPUPCM的结晶速率变慢，球晶尺寸变小，球晶稳定性提高。研究同时表明所制备的WPUPCM具有良好的热稳定性、循环使用稳定性和调温性能。

关键词: 乳液, 固-固相变材料, 水性聚氨酯, 相变, 结晶, 交联