纳米SiO2对静电纺LA-PA/PET复合相变纤维形态和热学性能的影响

以月桂酸和棕榈酸二元低共熔混合物(LA-PA)、聚对苯二甲酸乙二酯(PET)和纳米二氧化硅(SiO2)为原料,通过静电纺丝的方法成功制备了新型的LA-PA/PET/SiO2定形相变复合纤维。分别采用扫描电子显微镜(SEM)和差示扫描量热仪(DSC)研究了纳米SiO2对静电纺LA-PA/PET/SiO2复合相变纤维的形貌结构和热学性能的影响。SEM观察结果显示,随着纳米SiO2的加入,复合相变纤维表面呈现出光滑的形态特点,纤维直径有所降低;且随着纳米SiO2含量的增加而逐渐减小。DSC分析结果表明纳米SiO2的含量对复合相变纤维的熔化焓值和结晶焓值有一定的影响,对相变温度没有显著性的影响。

Effects of nano-SiO_2 on morphology and thermal energy storage of electrospun LA-PA/PET composite phase change fibers

The form-stable phase change composite fibers consisting of binary LA-PA eutectic,polyethylene terephthalate(PET) and silica nanoparticles(nano-SiO2) were successfully fabricated by the technique of electrospunning.The effects of nano-SiO2 on morphology and thermal energy storage properties of electrospun LA-PA/PET/SiO2 phase change composite fibers were investigated by SEM and DSC.The SEM images showed that the electrospun LA-PA/PET/SiO2 ultrafine composite fibers possessed the smooth surfaces morphologies with fiber diameters slightly smaller than those of the LA-PA/PET fibers with wrinkled surfaces;the average diameters of the ultrafine composite fibers gradual decreased with increasing content of the nano-SiO2 in the composite fibers.The DSC results indicated that the content of nano-SiO2 in the fibers plays an important role on the enthalpies values of melting and crystallization of the composite phase change fibers,while it had no significant effect on the temperatures of phase transitions.