水性聚氨酯相变储能材料的相变机理

以聚乙二醇(PEG)为软段、六亚甲基二异氰酸酯-1,4-丁二醇-二羟甲基丙酸(HDI-BDO-DMPA)为硬段,制备了一系列水性聚氨酯相变储能材料(WPUPCM)。在相变过程中,由于软段PEG由聚合前的固-液相变转化为聚合后的固-固相变,因此,所制备的WPUPCM表现出固-固相变特性。为了研究其固态相变行为的本质和形成机理,揭示该类聚合物的能量贮存和转换机理,应用偏光显微镜、扫描电镜、原子力显微镜、X射线衍射仪分析研究了PEG、WPUPCM在相变过程中的晶体结构变化特征,讨论了WPUPCM固-固相转变的机理。

Phase change mechanism of waterborne polyurethane phase change material

With PEG (polyethylene glycol) being the soft segment and HDI-BDO-DMPA (hexamethylene diisocyanate-1, 4-butylene - dimethylol propionic acid) being the hard segment, a series of WPUPCM (waterborne polyurethane phase change material) were prepared in this paper. Specifically speaking, in the phase change process, PEG transformed into the solid-solid phase change from the solid - liquid phase change, exhibiting solid - solid phase transition characteristics. Moreover, this study utilized Polarized light microscopy (POM), scanning electron microscopy (SEM), atomic force microscopy (AFM) and X-ray diffraction (WAXD) to analyze the crystal structure variation characteristics of PEG and WPUPCM in the phase transition process, thereby analyzing WPUPCM solid - solid phase transition mechanism for the purpose of studying the behavior nature and formation mechanism of WPUPCM solid phase transition and revealing the energy storage and conversion mechanisms of such polymers