以聚丙烯腈(PAN)和二甲基亚砜(DMSO)为原料,采用新型微纳层叠挤出技术制备了微纳层叠带状聚丙烯腈(PAN)基初生纤维,利用扫描电子显微镜、X射线衍射仪、电子万能试验机对初生纤维的性能进行了研究。分析了纤维凝固成形过程中空气层高度、凝固浴温度、凝固浴浓度对微纳层叠带状PAN初生纤维性能的影响。结果表明:层叠带状PAN初生纤维相比于传统圆形截面纤维,在纺丝过程中能保持良好的带状截面不变形;并且在空气层高度为30mm,凝固浴温度为45℃,凝固浴浓度为40%工艺条件下制备的层叠带状PAN初生纤维综合性能较好,获得了结晶度为31.3%,晶粒尺寸为4.53nm,拉伸强度为14.60MPa的层叠带状PAN初生纤维。
micro-nano laminated ribbon-shaped PAN nascent fibers were prepared by a new micro-nano laminated extrusion technique using polyacrylonitrile (PAN) and dimethyl sulfoxide (DMSO) as raw materials.The properties of the nascent fibers were characterized by means of scanning electron microscopy (SEM),X-ray diffraction (XRD),and electrical testing machine.The effects of air layer height,coagulation bath temperature and coagulation bath concentration on the performance of the micro-nano laminated ribbon-shaped PAN nascent fibers were studied.It was found that the laminated ribbon-shaped PAN nascent fibers could maintain a good ribbon-shaped cross-section without deformation during the spinning process compared with the conventional circular cross-section fibers.Under the conditions of an air layer height of 30mm,coagulation bath temperature of 45℃and coagulation bath concentration of 40%,the prepared laminated ribbon-shaped PAN nascent fibers exhibited a better overall performance,with a crystallinity of 31.3%,a grain size of 4.53nm and a tensile strength of 14.6MPa.
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基金资助
国家自然科学基金面上项目(52073012)
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