In this study, we use water-soluble polyurethane (PU) as the shell material, Eicosane (phase change material, PCM) as the core material to prepare the capsules by solvent evaporation method, at the shell: core ratio of 1:1, 5:1, 10:1. The formation of capsules was observed by stereomicroscope, and the eutectic temperature, reproducibility were determined by DSC. The results show that water-soluble polyurethane completely encapsulated Eicosane at the shell: core ratio of 10:1 obtained good formation, thermal property and reproducibility, is the optimal condition of this study.
