【作者】 谢慧方；

【导师】 于伟东；

【作者基本信息】 武汉科技学院 ， 纺织材料与纺织品设计， 2007， 硕士

【摘要】 本文对聚乙二醇系列、聚乙二醇二元体系进行DSC测试。通过对试验结果的分析,研究PEG的分子量、配比、组分与相变焓、相变点的关系;寻求对相变材料的相变点较为精确的控制方法,并以此为据,选取符合服用要求的二元聚乙二醇体系。实验发现:单一组分的PEG熔融吸热量和熔融温度以及其它性能均与其分子量存在很大的依存性,而且分子量越大,熔点温度越高(涉及范围为10～80℃),熔融热越大(涉及范围为100～200J/g)。理论上虽能选择不同分子量的PEG来满足实际要求,但材料的可造性和加工难度较高。而将不同分子量的PEG混合将克服纯PEG存在的上述问题,并得到单一组分的PEG所不具有的优良性能和可调整性。尤其当合理混配不同分子量的聚乙二醇,可得到适于服用自适性相变纺织品的工作物质,相变温度可在30～60℃;相变能为150～190J/g,并通过对此二元聚乙二醇体系的相变行为的分析,得到较优的配伍方式PEG1000/2000。将选取的二元聚乙二醇体系与液态PU共混制备多孔相变膜。通过对多孔相变膜的基本特征和服用性能多项测试和表征。试验结果证明,PEG与PU共混没有新的化学键生成,PEG在PU多孔膜内仍然具有与自身相似的结晶结构。同时,PEG/PU多孔相变膜具有合适的相变温度(40～55℃)、较高的相变焓(129.1J/g),并且在相转变温度时,透湿性能有突变,具有自动调湿功能。通过采取多孔填充的成形方法不仅改善了多孔相变材料的柔韧性,解决了目前相变纺织品工作物质含量低的问题,加上透湿性与热调节性发挥着协调作用,该材料可以作为一种调温蓄热的功能的纺织材料。另外,将此多孔填充技术引用到相变纺织品的成形技术中,为提高调温蓄热纺织品的相变焓提供了一种新方法。更多还原

【Abstract】 In this paper, PEG was selected as phase change material. In order to control transition point accurately, DSC tests were performed to investigate the relationship between the molecular weight, matching ratio, components and transition point, transition enthalpy. Based on the analysis, the perfect PEG binary systems were selected. The results indicated:The melting enthalpy(100～200J/g), melting temperature(10～80℃)and others properties of PEG depended on the molecular weight much and there was a positive increasing relationship between them, theoretically pure PEG of different molecular weight can satisfied with practical demands, but it is hard to produce the material . However the blend of PEG with different molecular weights can solve these problems which pure PEG encountered, and achieve better properties. Especially when blended PEG of different molecular with appropriate ratio, work material suitable for self-adaptable phase change fabrics can be acquired, which transition temperature is about 30～60℃and transition enthalpy is about 150～190J/g. By the analysis of phase change of PEG1000/2000 binary system, the better matching mixture will be obtained.Subsequently, PEG binary systems selected were blended with liquid PU to prepare the porous membrane PCM. After a series of characterizations and testing, the properties and characteristic of porous membrane PCM were investigated. The result showed there was no new chemical bonds appearing after the blending of PEG and PU, and PEG kept same crystallization structure. Further more, porous membrane PCM had suitable transition temperature(40～55℃) and high transition enthalpy(129.1J/g). In addition, the moisture permeability changed abruptly during transition, which had self-adjusted ability and cooperated with thermal adjusting.It meant that porous membrane PCM can be regarded as functional fabrics. This method can improve the flexibility of porous PCM and solved the problem of low content of working materials problem in fabrics; can also cooperated with thermal adjusting and moisture adjusting, it succeed in introducing the porous technical into the fields of functional fabric’s formation, and developed a new way to improve the phase change enthalpy largely for adjustable fabrics.更多还原