Poly (ethylene glycol) (PEG) blended with poly (L-lactic acid) (PLLA) as novel green and sustainable shape-stabilized phase change materials (PCMs) were prepared and characterized in this study. The miscibility and morphology of the blends played an important role in the properties of the PCMs. The partial miscibility between PEG and PLLA resulted in suitable latent heat and a low leakage percentage of PCMs. The typical spherulite structure with a Maltese cross was examined in neat PLLA, as observed using polarized optical microscopy. However, the addition of PEG to PLLA led to the formation of ring-banded spherulites due to the presence of PEG altering the aggregation and twisting the PLLA lamellae. These PLLA crystalline structures can capture liquid (including molten PEG), stabilize the shape, and prevent leakage. The thermal mechanical analysis results indicated that the thickness of the PEG/PLLA blends was not significantly changed during the phase change process. The PEG/PLLA 75/25 blends exhibited appropriate film forming properties and mechanical strength. Moreover, differential scanning calorimetry analysis demonstrated the largest latent heat of melting (130.26 J/g), which could have great potential for developing novel phase change materials for thermal energy storage.

制备并表征了聚乙二醇（PEG）与聚（L-乳酸）（PLLA）混合作为新型绿色和可持续形状稳定的相变材料（PCM）。混合物的混溶性和形态在PCM的性能中起着重要作用。PEG与PLLA之间的部分混溶性导致合适的潜热和较低的PCM泄漏百分比。使用偏振光学显微镜观察，在纯净的PLLA中检查了具有马耳他十字的典型球晶结构。然而，由于PEG的存在改变了聚集并扭曲了PLLA薄片，因此向PLLA中加入PEG导致了环带状球晶的形成。这些PLLA晶体结构可以捕获液体（包括熔融的PEG），稳定形状并防止泄漏。热力学分析结果表明，在相变过程中，PEG / PLLA共混物的厚度没有明显变化。PEG / PLLA 75/25共混物表现出适当的成膜性能和机械强度。此外，差示扫描量热分析显示最大的熔化潜热（130.26 J / g），对于开发新型的用于热能存储的相变材料具有巨大的潜力。