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23 J/g逐渐增加到57 J/g。此外，PC16E2AC-P（AN-co-VDC）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24 h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) (PC16E2AC), was successfully synthesized by the free radical polymerization method. PC16E2AC 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 PC16E2AC-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 PC16E2AC-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 PC16E2AC-P(AN-co-VDC) composite thermo-regulated fibers. It is noted that the melting peak temperature of the PC16E2AC-P(AN-co-VDC) composite thermo-regulated fibers always remains at about 35℃, which indicates the potential for their application in smart textiles. 天津市应用基础与前沿计划重点项目（16JCZDJC37000）