梳状相变聚合物为芯材的复合调温纤维的制备及热性能

Fabrication and thermal properties of wet-spun thermo-regulating fibers with a novel comb-like phase change polymer core

通过自由基聚合方法成功制备的新型梳状相变聚合物-聚二乙二醇十六烷基醚单丙烯酸酯(PC16E2AC),其相变温度为35℃,十分接近人体温度。选取PC16E2AC为芯材,丙烯腈偏氯乙烯共聚物(P(AN-co-VDC))为皮材,利用同轴湿法纺丝工艺制备了一系列热焓值不同的PC16E2AC-P(AN-co-VDC)复合调温纤维,并对其形貌、结构和热性能进行了表征。结果表明:制备的PC16E2AC-P(AN-co-VDC)复合调温纤维直径均一,表面光滑,具有明显的皮芯结构。并且随着皮芯挤出比(S∶C)的增加,皮材直径逐渐增大,芯材直径逐渐减小,复合调温纤维的断裂强度逐渐增大,热焓值也从23J/g逐渐增加到57J/g。此外,PC16E2AC-P(AN-coVDC)复合调温纤维在低于220℃具有良好的热稳定性。300次的冷/热循环测试和24h的抽提实验表明,该复合调温纤维具有良好的耐热循环稳定性和抗渗透性。值得注意的是,PC16E2AC-P(AN-co-VDC)复合调温纤维的相变温度始终在35℃左右,表明其有望用于智能纺织品领域。

A novel phase change polymer,poly（diethylene glycol hexadecyl ether acrylate）（PC16 E2 AC）,was successfully synthesized by the free radical polymerization method.PC16 E2 AC with melting peak temperature at approximately 35℃,being close to the temperature of human skin,was selected as the core material to fabricate a series of core-sheath thermo-regulating fibers with various heat enthalpies via bicomponent wet-spinning technology with acrylonitrile-vinylidene chloride copolymer（P（AN-co-VDC））being employed as sheath.The morphology,microstructure and thermal property of the composite thermo-regulated fibers were characterized systematically.The results show that the PC16 E2 AC-P（AN-co-VDC）composite thermo-regulated fibers have uniform diameter,smooth surface and obvious core-sheath structure.Moreover,with increasing of the core-sheath extrusion ratio（S∶C）,the diameter of sheath increases gradually while the diameter of core shows the opposite trend.The breaking strength of PC16 E2 AC-P（AN-co-VDC）composite fibers improves steadily and the enthalpy also changes from 23 J/g to 57 J/g in the meantime.The fibers have good thermal stability under 220℃.300 times thermal cycle test and 24 hours extraction experiment in toluene shed light on the good thermal reliability and excellent anti-osmosis property of the PC16 E2 AC-P（AN-co-VDC）composite thermo-regulated fibers.It is noted that the melting peak temperature of the PC16 E2 AC-P（AN-co-VDC）composite thermo-regulated fibers always remains at about 35℃,which indicates thepotential for their application in smart textiles.