SBIR Phase I: Investigation of Phase Change Materials Microcapsules for High Temperature Applications

9560213布莱恩特这个小型企业创新研究(SBIR)第一阶段项目将研究相变材料(PCM)的微胶囊，其形式足够稳定，足以承受熔融纺丝过程。如果可以将微型相变材料加入熔融纺丝纤维中，得到的织物(聚丙烯、尼龙、聚酯)的储热能力将大大提高。微型相变材料已成功地应用于低温溶液纺丝聚丙烯酸酯纤维和织物样品中，使其储热能力提高了十倍。然而，在熔融纺丝温度(高于200oC)时，微细相变材料颗粒会失去其核心材料，这会破坏熔融纺丝过程。在这些材料可以成功地并入熔融纺丝纤维之前，胶囊必须具有更稳定的壁结构。第一阶段将使用差示扫描量热仪(DSC)和热重分析(TGA)来确定当前微型相变材料在超过200℃的温度下的行为，并了解微胶囊失效的机理。在此基础上，将制备具有改进型壁面结构的微胶囊。它们在高温下的稳定性将与现有的微胶囊进行比较。微型相变材料的热稳定性最有希望的概念将在第二阶段被追求。随着在熔融纺丝温度下稳定的微型相变材料被制造出来，熔融纺丝纤维可以制造和销售用于服装和工业绝缘材料的热增强材料，在这些需要热或冷控制的地方。

9560213 Bryant This Small Business Innovation Research (SBIR) Phase I project will investigate microencapsulation of phase change materials (PCMs) in a form stable enough to withstand the melt spinning process. If micro PCMs could be incorporated into melt-spun fibers, the resulting fabrics (polypropylene, nylon, polyester) would have greatly enlarged thermal storage capacities. Micro PCMs have been successfully incorporated into low temperature, solution-spun acrylic fibers and fabric samples, increasing their thermal storage tenfold. However, at melt spinning temperatures (higher than 200oC) micro PCMs particles lose their core material, which corrupts the melt spinning process. Before these materials can successfully be incorporated into melt spun fiber, capsules must be available with more stable wall structure. Phase I will use differential scanning calorimetric (DSC) and thermogravimetric analysis (TGA) to establish the behavior of current micro PCMs at temperatures exceeding 200oC and to understand the mechanism of microcapsule failure. On this basis microcapsules will be produced with modified wall structures. Their stability at high temperature will be compared to that of existing microcapsules. The most promising concepts for thermal stability of micro-PCMs would be pursued in Phase II. As micro-PCMs that are stable at high melt-spinning temperatures are made, thermally enhanced materials can be fabricated and marketed from melt spun fibers for apparel and industrial insulation materials, where hot or cold thermal control is needed.