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中文摘要：
制备了皮芯结构的PLA/EVOH复合纤维棒,采用激光熔体静电纺丝法将纤维棒制成微纳米纤维毡,研究了EVOH涂覆对电纺纤维直径和形貌的影响.利用扫描电子显微镜（SEM）、傅里叶红外光谱（FT-IR）及水接触角测试（WCA）对纤维形貌、分子结构和亲水性进行了表征.SEM结果表明：EVOH涂覆后,PLA纤维直径可从约7μm显著减小到约1μm；因两种聚合物性质的差异性,EVOH剥离后PLA纤维呈槽状结构,该结果被FT-IR证实.WCA结果表明EVOH涂覆后PLA的疏水性更明显.
英文摘要：
Rodlike PLA/EVOH composite fibers with skin core structure were made. Micro/nano fibers were produced from these rod-like fibers using a laser melt-electrospinning system, and the effects of EVOH component on fibers diameter and morphology were described. The micromorphology of the fibers was studied by scanning electron microscope （SEM）. The molecular orientation was characterized by Fourier transform infrared spectroscopy （FT-IR）. The hydrophilicity of the nano-scale fiber mats was analyzed by water contact angle （WCA）. With the SEM results, it was proved that PLA coated with EVOH has a significant effect on decreasing fiber diameter from 7 ~m to 1 t~m or so. The property of EVOH melts is differernt with that of PLA melts, and the situation of electrospinning is much more complicated. For this reason, the fibers obtained a trough structure after the removal of EVOH. The trough structure of PLA was proved by FT-IR test. The PLA proves to be more hydrophilicity than the PLA/EVOH.
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