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用乙烯-辛烯共聚物(POE)、乙烯-醋酸乙烯共聚物(EVA)取代高密度聚乙烯(HDPE)作为包覆材料,石蜡作为相变材料,通过热熔法制备了60%石蜡含量的定形相变材料(FSPCM),以此来提高定形相变材料的稳定性。用高温老化试验,恒温水浴试验和温度循环试验研究了定形相变材料的稳定性能。试验结果表明,POE/石蜡定形相变材料和EVA/石蜡定形相变材料的质量损失率远小于HDPE/石蜡定形相变材料的质量损失率。利用DSC研究了定形相变材料、石蜡及相应的基体树脂的热性能,并以此计算定形相变材料中实际的石蜡含量。结果表明,当设计含量为60%时,POE/石蜡定形相变材料和EVA/石蜡定形相变材料的实际石蜡含量为49.75%和58.49%,而HDPE/石蜡定形相变材料的仅为42.78%。这一结果与HDPE/石蜡定形相变材料样品在平板硫化机制备过程中发现有较多石蜡流出相一致。
High-density polyethylene (HDPE) was replaced by ethylene-octene copolymer (POE) and ethylene-vinyl acetate copolymer (EVA) as coating materials and paraffin wax was used as phase change material Deformation of phase change material (FSPCM), in order to improve the stability of the phase change material. The stability of the phase change material was studied by high temperature aging test, constant temperature water bath test and temperature cycling test. The experimental results show that the mass loss rate of POE / paraffin phase change material and EVA / paraffin phase change material is far less than that of HDPE / paraffin phase change material. The thermal properties of the phase change material, paraffin wax and the corresponding matrix resin were studied by DSC, and the actual paraffin content of the phase change material was calculated. The results show that the actual paraffin content of POE / paraffin phase change material and EVA / paraffin phase change material are 49.75% and 58.49%, respectively, while the design content is 60%, while the HDPE / paraffin phase change material is only 42.78% . This result is consistent with the more paraffinic wax excretion found during the preparation of flat vulcanisers for the HDPE / paraffin shaped PCM samples.