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利用熔融纺丝相分离行为制备乙烯-乙烯醇共聚树脂(EVOH)纳米纤维,并利用湿法成网的方法制备EVOH纳米纤维膜,分析表征了EVOH纳米纤维的形态、结构、结晶性能及纤维膜的形态、孔隙率、孔径大小和分布、比表面积等。结果表明:乙烯-乙烯醇共聚树脂/乙酸丁酸纤维素酯(EVOH/CAB)经双螺杆熔融挤出去除CAB后所制备的EVOH纳米纤维平均直径为162～260nm,加工条件和方法对EVOH的结构和结晶性能没有明显影响。随着纤维膜厚度增加,EVOH纳米纤维膜的孔径减小、孔径分布变窄;随着纳米纤维制备过程中EVOH/CAB体系中EVOH含量增大,EVOH纳米纤维直径增大,其功能膜的孔隙率增大、比表面积减小。
The EVOH nanofibers were prepared by melt spinning phase separation. The EVOH nanofibers were prepared by wet-laid method. The morphology, structure, crystallinity and fiber properties of the EVOH nanofibers were analyzed. Morphology, porosity, pore size and distribution, specific surface area and so on. The results showed that the average diameter of EVOH nanofibers prepared by melt extrusion of ethylene-vinyl alcohol copolymer / cellulose acetate butyrate (EVOH / CAB) by twin-screw was 162-260nm. The processing conditions and methods of EVOH The structure and crystallinity have no significant effect. With the increase of membrane thickness, the pore size of EVOH nanofiber membrane decreases and the pore size distribution becomes narrower. With the increase of EVOH content in EVOH / CAB system during the preparation of nanofibers, the diameter of EVOH nanofibers increases, and the pores of functional membranes The rate increases, the specific surface area decreases.