Abstract: Form-stable phase change materials were prepared by taking low density polyethylene (LDPE) and ethylene/octene copolymer (POE) as the cladding material and paraffin wax as phase change material respectively. SEM，DSC and rheological curve were used to analyze and characterize the blends. SEM showed completely different morphology for the two systems. DSC indicated that the more the paraffin wax，the greater the latent heat. The latent heat of POE/paraffin wax blend was greater than that of LDPE/paraffin wax blend. Rheological properties showed that paraffin wax improved the storage modulus of the matrix in its solid state. In LDPE/paraffin wax system，LDPE formed a continuous phase，but as the melting temperature of POE was very close to paraffin wax，we could not distinguish which one was continuous from the rheological curve.

Key words: phase change, polyolefin, DSC, rheological properties

摘要： 分别以低密度聚乙烯（LDPE）和乙烯-辛烯共聚物（POE）为包覆材料，以石蜡为相变材料，制备了定形相变材料，采用SEM、DSC和流变性能对其进行分析表征。SEM电镜显示了两种不同的表面形貌；DSC测试表明石蜡加入量越多，潜热越大，POE/石蜡体系的潜热高于LDPE/石蜡体系；流变性能研究表明，石蜡的加入在固态时提高了基体的储能模量，对于LDPE/石蜡体系，LDPE为连续相；对于POE/石蜡体系，由于POE和石蜡熔融温度非常接近，分辨不出谁是连续相谁是分散相。

关键词: 相变, 聚烯烃, DSC, 流变性能