聚丙烯/蒙脱土基定形相变材料共混体系的结构与性能

Structure and Properties of Polypropylene/Montmorillonite Based Shape Stabilized Phase Change Material Blend System

针对聚丙烯(PP)相变纤维加工中的低相变焓、低导热率及高泄露等问题,以聚乙二醇单甲醚(MPEG1000)为相变材料,蒙脱土(MMT)为定形材料,利用熔融插层法制备MPEG1000/MMT定形相变材料,并与PP树脂熔融共混制备PP/MMT/MPEG1000共混体系。采用扫描电镜分析相变材料在共混体系中的分散情况,采用差示扫描量热法分析共混体系的相变性能,采用红外光谱分析共混体系各组分之间的相互作用。结果表明:定形相变材料粒子在PP/MPEG1000/MMT共混体系中分布均匀,粒径在2~5μm左右,相变焓高达21.4 J/g;与PP/MPEG1000共混物对比,PP/MPEG1000/MMT共混体系的相变焓是其3.6倍。定形相变材料的制备有效解决了MPEG1000在PP熔融加工过程中的泄露问题,为PP相变纤维的制备奠定了基础。

According to the low phase change enthalpy, low thermal conductivity and high leakage problem in the process of polypropylene（PP） phase change fiber, methoxypolyethylene glycols 1000（MPEG1000） was used as the phase change material and sodium based montmorillonite（MMT） was used as the shape stabi- lized material. MPEG1000/MMT shape stabilized phase change material was synthesized via melting intercalation. PP/MPEG10OO/MMT blend system was prepared by melt blending with polypropylene resin. The dispersion of phase change materials in the blend system was analyzed by SEM. The phase transition proper- tity of the blends were analyzed by DSC, and the interaction between the components of the blends was ana- lyzed by FTIR. The result showed that the shape stabilized phase change material of the PP/MMT/ MPEG1000 blend system was in uniform and particle size was about 2~5 ~m. The phase change enthalpy PP/MPEG1000/MMT blend system was up to 21.4 J/g. Compared with PP/MPEGI000 blend system, the phase change enthalpy of PP/MPEG1000/MMT blend system was 3.6 times of PP/MPEG1000 blend. The leak problem of MPEG1000 could be effectively solved by MPEG1000/MMT shape stabilized phase change materials in hot melt processing, which lays a foundation for the preparation of PP phase chanze fiber.