【作者】 王玮玲；

【导师】 于伟东；

【作者基本信息】 东华大学 ， 纺织材料与纺织品设计， 2004， 硕士

【摘要】 在对聚乙二醇(PEG)进行冷热循环处理时，其超分子结构会发生某种相的转变，从而改变宏观性质而具有特殊的蓄热调温性能。这种蓄热调温性能突出表现在高温时吸收热能、储存能量，环境温度降低时释放能量，将热量放出。由于PEG发生转变的温度在自然环境温度变化范围之内，而且研究发现，PEG还可与纺织纤维发生物理或化学的结合，有被添加到纺织品上的可能，进而又继续拓宽研究领域，将其应用在纺织材料上，赋予纺织品特殊的温度调节功能。 这种相变材料，由于分子链较长、分子量是分布的，结晶又不完善，因此相变过程有一个熔融温度范围，而不像低分子量的物质有明显的熔融尖峰。这种熔融峰特征，使材料的相变过程较为平稳和可控，不易出现过冷现象和相分离。而且材料在固体状态时成型性较好、本身腐蚀性小、性能较稳定、毒性小和成本低。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，熔融热越大。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纤维材料的工作物质，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。 为了选取符合服用要求的二元聚乙二醇体系，对不同配比的体系进行DSC测试。结果表明，PEG二元体系的DSC图谱并不是体系中两组分单独时DSC图谱的简单相加，而是出现了两个大小不一的吸热峰和一个放热峰，这说明不同分子量的PEG两组分，混合前后所处的物理状态不同，混合体系内发生了某种物理变化，可能使得PEG大分子重新排序、取向，结晶相发生了改变，使得各特征参数摘要值发生变化。 将选取的PEG二元体系加水溶解，采用真空方法填充涤纶中空纤维，并分析了溶液浓度、温度、纤维长度等各影响因素对填充效果的影响。结果表明:(1)在常温下，当溶液浓度为50%时，填充率达到最大值;(2)中空纤维的长度对填充率影响较小;(3)随着溶液温度升高，填充率随之提高。填充后纤维的红外扫描证实相变材料己被填充到纤维中。 对填充后的中空纤维进行DSC测试，结果表明，填充后纤维相变温度与相变材料的相变温度稍有变化。经过8次升降温循环后，纤维的相变温度、相变热均有所降低，但降低幅度不大，重复使用性能较好。填充后纤维强力测试、摩擦系数测试均有所变化。为了表征相变纤维的其它性能，建立传热模型，初步得到纤维的传热系数、导热系数等参数。更多还原

【Abstract】 When polyethylene glycols(PEG) has a reversible heating and cooling, its super molecule structue will have some change in macroscale of its properties called phase transition. The PEG has a special accumulation of heat and regulation to temperature. These properties are showed when it exotherms at high temperature and endotherms at low temperature. Because the temperatures in phase change of PEG are in the range of natural environmental condition, moreover, it is found that PEG can physically or chemically conjoint with fibers, so it has the possibility to add to fabrics and some other textile materials, and endure the fabrics the function of regulating temperature.Because it has long molecule, different molecular weight, and imperfect crystal structure, the temperature of melting is ranged, unlike the low molecular weight material, has a prominence peak. Because of the melt property, the process of phase change is stable and controllable, the phase detaches will not happen easily. Besides these, the material can be shaped well, the erosion is small, the behavior is steady, toxicity is small and costs less. Though we can select different molecular weight theoretically to achieve the factual demands, it is difficult to make. But we can mix the PEG with different molecular weights, then we can solve these problems and achieve better properties than monocomponent PEG. Especially when equitably mix different molecular PEG, we can get the material that it’s suitable to adaptable phase change fiber for wear. By testing the two PEG systems with DSC, the better mixture will be abtained.The experiments of DSC on different content PEG have been done in order to get suitable PEG system. The results show that the two system isn’t simply added by the monocomponent. But it appears twodifferent peak. It can be said that, the two different component generate something physical change because the different states during the process. It is probable that the PEG molecular weight resort and reorientation, and correspondingly the characteristic parameters change.The system is changed into solution by adding water and hollow fibers are filled with the solution in vacuum. Moreover, the affection of solution concentration, solution temperature and fibers length on the filling have been analyzed. The results show that: (1) at normal temperature, filling ratio rises to the maximum at 50% of solution concentration; (2) the length of hollow fibers influences the filling ratio slightly; (3) the filling ratios becomes large with the increase of temperature. But the solution at large concentration has more notable effects on the filling ratio than one of small solution at the same temperature.DSC experiments have been done on the filled fibers. The results show that the Tm and Hm of filled fibers are nearby similar to PCMs. After 8 heating cycles, the Tm and A Hm reduce a little, so that the fibers can be used repeatedly. The tensile measurements show that the strength and abrasion of the filled single fiber have changed respectively. To characterize the other properties of the phase change fibers, we establish a heat transfer model and the model can get fibers’ conductive coeffient , density and other parameters. The IR graph proves that PCMs have been filled into fibers.更多还原