采用干喷湿法纺丝技术引入聚己内酯(PCL)作为复合材料以非溶剂致相分离(NIPS)原理制备不同PCL含量的聚对苯二甲酸乙二醇酯(PET)/PCL复合中空纤维,系统探究PCL引入与添加量对纤维结构-性能关系的影响,通过扫描电镜、原子力显微镜观察其截面和表面形貌,结合强力试验机测试复合纤维的力学性能。结果表明:PCL的引入改变了PET的内部孔隙结构和PET颗粒连接状态,显著提升了纤维的机械性能,并使中空纤维截面形貌由指状孔到形成均质化海绵孔结构的转变,PET/PCL复合中空纤维在长时间通量测试下有着更为优异的通量稳定性。此外,固体表面电位测试结果表明其在血管移植物方面有着潜在应用价值。
Using a dry-jet wet-spinning technique,polycaprolactone (PCL) was introduced as a composite material to prepare PET/PCL composite hollow fibers with different PCL contents based on the the non-solvent induced phase separation (NIPS) principle.This study systematically investigated the effects of PCL introduction and its amount on the structure-performance relationship of the fibers.Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to observe the cross-sectional and surface morphologies,while a universal testing machine was employed to measure the mechanical properties of the composite fibers.The results showed that the introduction of PCL altered the internal pore structure and particle connectivity of PET,significantly enhancing the mechanical properties of the fibers and transforming the hollow fiber cross-section morphology from finger-like pores to a homogeneous sponge-like structure.The PET/PCL composite hollow fibers also exhibited superior flux stability under long-term filtration tests.Additionally,solid surface potential measurements indicated potential applications in vascular grafts.
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