加工工艺条件对PA6/LDPE共混纺制PA6纳米纤维的影响

以聚乙烯接枝马来酸酐(PE-g-MAH)作为反应型增容剂,采用熔体共混直接纺丝的方法制备出PA6/LDPE共混纤维,溶出LDPE基体相,获得不同直径的PA6纳米纤维.通过扫描电镜(SEM)和差示扫描量热(DSC)测试,研究了牵伸倍数、相容剂以及混流板对共混纤维的剥离性能、PA6纳米纤维的直径以及结晶度的影响.结果表明:加入3.5%的相容剂能使PA6超细纤维的直径降低到180 nm以下;增加混流板的组数,导致PA6纳米纤维之间粘连,不易剥离;提高共混纤维拉伸倍数,PA6纤维的直径降低且结晶度增加.在PA6质量分数为55%、相容剂质量分数为3.5%条件下,加入一组混流板,可制备出纤维平均直径在100 nm左右且分布均匀的PA6纳米纤维.

Effects of Processing Condition on PA6 Nanofibers

Using maleic anhydride-grafted polyethylene （PE-g-MAH） as a reactive compatibilizer, the PA6/LDPE blend fibers were fabricated by melt mixing and direct spinning. PA6 nanofibers with different diameter were acquired by removal of LDPE matrix phase. The effect of the drawing ratio, the content of compatibilizers, and static mixer on the properties of PA6 nanofibers was investigated by means of scaning electron microscopy （SEM） and differential scaning calorimetry （DSC）, re- spectively. When the content of PE-g-MAH is 3.5% , the PA6 superfine fibers with an average di- ameter below 180 nm were obtained. With the increase of the numbers of static mixer, the stripping performance of blend fibers decreases and PA6 nanofibers conglutinate each other. The diameter of PA6 fibers decreases and the crystallinity increases with increasing the drawing ratio of blend fibers. PA6 nanofibers with an average diameter of 100 nm were produced from the blend fiber when the mass ratio of PA6/LDPE/PE-g-MAH was 55/41.5/3.5, by using a group of static mixer and controlling processing conditions.