The preparation of poly(l-lactic acid) (PLLA)-based microcapsules containing phase change material Rubitherm 27 (RT27) by microsuspension polymerization was first developed. Before polymerization, a commercial PLLA was depolymerized via glycolysis to produce a shorter molecular chain as in PLLA glycosates (GPLLA). The influence of the polymer shell on particle morphology was studied by Optical microscope and Scanning electron microscope. The chemical structures of the obtained polymer microcapsule were characterized by Fourier-transform infrared spectroscopy and Nuclear magnetic resonance spectroscopy. The thermal properties and content of encapsulated RT27 were measured by Differential scanning calorimetry and Thermogravimetric analysis. Phase separation was clearly observed after droplet generation with methyl methacrylate, ethylene glycol dimethacrylate, and polyethylene glycol diacrylate as comonomers. After polymerization, broken particles were obtained. In contrast, a spherical microcapsule with a smooth surface was obtained with copolymerization between GPLLA and glycidyl methacrylate. In addition, high encapsulation efficiency (96 %) was obtained. The latent heats of encapsulated RT27 in the term of J/g-RT27 were 202 and 200 J/g-RT27 for the heat of melting and crystallization, respectively, which were close to those of the pristine RT27. Moreover, a supercooling phenomenon was not observed.

首先开发了通过微悬浮聚合制备包含相变材料Rubitherm 27（RT27）的基于聚（l-乳酸）（PLLA）的微胶囊。聚合之前，商业化的PLLA会通过糖酵解作用进行解聚，以产生与PLLA糖化物（GPLLA）相同的较短的分子链。用光学显微镜和扫描电子显微镜研究了聚合物壳对颗粒形貌的影响。通过傅立叶变换红外光谱和核磁共振光谱对得到的聚合物微胶囊的化学结构进行表征。通过差示扫描量热法和热重分析法测量RT27的热性质和含量。用甲基丙烯酸甲酯产生液滴后，明显观察到相分离，乙二醇二甲基丙烯酸酯和聚乙二醇二丙烯酸酯作为共聚单体。聚合后，得到破碎的颗粒。相反，通过在GPLLA和甲基丙烯酸缩水甘油酯之间共聚获得具有光滑表面的球形微胶囊。另外，获得了高的封装效率（96％）。用J / g-RT27表示的封装RT27的潜热，其熔化热和结晶热分别为202J / g-RT27，接近原始RT27的潜热。此外，未观察到过冷现象。获得了很高的封装效率（96％）。用J / g-RT27表示的封装RT27的潜热，其熔化热和结晶热分别为202J / g-RT27，接近原始RT27的潜热。此外，未观察到过冷现象。获得了很高的封装效率（96％）。用J / g-RT27表示的封装RT27的潜热，其熔化热和结晶热分别为202J / g-RT27，接近原始RT27的潜热。此外，未观察到过冷现象。