CAJ | 학술논문

采用湿法纺丝得到聚丙烯腈(PAN)初生纤维,干燥后得到PAN初生纤维样品.利用电阻法确定初生纤维的共晶温度;获得初生纤维的冻干曲线;通过压汞法对初生纤维孔结构进行表征,并对比考察了鼓风干燥、自然风干和冷冻干燥对样品截面形貌的影响.结果表明:初生纤维的共晶温度为-55℃;鼓风干燥会使样品收缩,纤维间发生粘连,原有形貌被破坏;自然风干使样品的截面积和周长分别收缩了20.66%、10.67%,形状系数变化率为3.52%.而冷冻干燥时样品的截面积和周长仅收缩了1.21%、1.15%,形状系数变化率为1.13%.冷冻干燥有效地保留了PAN初生纤维的固有原始结构,可用于制备各种分析的样品.
채용습법방사득도취병희정(PAN)초생섬유,간조후득도PAN초생섬유양품.이용전조법학정초생섬유적공정온도;획득초생섬유적동간곡선;통과압홍법대초생섬유공결구진행표정,병대비고찰료고풍간조、자연풍간화냉동간조대양품절면형모적영향.결과표명:초생섬유적공정온도위-55℃;고풍간조회사양품수축,섬유간발생점련,원유형모피파배;자연풍간사양품적절면적화주장분별수축료20.66%、10.67%,형상계수변화솔위3.52%.이냉동간조시양품적절면적화주장부수축료1.21%、1.15%,형상계수변화솔위1.13%.냉동간조유효지보류료PAN초생섬유적고유원시결구,가용우제비각충분석적양품.
The sample of PAN nascent fibers was prepared by wet-spinning and drying technology. The co-crystal temperature of PAN nascent fibers was measured by electri-resistivity method. The freeze drying curve was obtained. The pore structure of PAN nascent fibers was measured by mercury porosimetry and the effect of air drying, natural drying and freeze drying on the section pattern of PAN nascent fibers was discussed. The results indicate that the co-crystal tempera-ture of PAN nascent fibers specimen was -55℃. Air dried samples had shrinkage and became bound together because of adhesion. The inherent structure of PAN nascent fibers was destroyed. The sectional area, perimeter and shape coefficient were reduced by 20. 66, 10. 67 and 3. 52 percent during natural drying, respectively, while reduced by 1. 21,1.15 and 1.13 percent during freeze drying. The inherent structure of PAN nascent fibers was preserved during freeze drying. It was prepared for PAN nascent fibers specimen by freeze-drying technology.