细旦丙纶的拉伸性能和加弹变形性能探讨

着重探讨了细旦丙纶的拉伸性能和加弹变形性能。试验发现，要获得拉伸性能好、性能优良的细旦丙纶，切片中必须加入高分子量添加剂的可控流变聚丙烯（ＣＲＰＰ），卷绕丝的结构，晶型以大方酝晶为主，结晶度较低，预取向达到一定值。加弹变形温度和产生紧点的临界温度均低于普通丙纶。随着变形温度的增加，紧缩弹性恢复享有一最大值，断裂强度和伸长随之下降，紧点数逐渐增多。

RESEARCH ON THE DRAWING AND FLASE TWIST TEXTURING PERFORMANCE OF FINE DENIER POLYPROPYLENE FILAMENT

The drawing and the false twist texturing performance of fine denier polypropylene(PP)filament are investi-gated in this paper. In order to obtain fine denier PP filament with better drawing performance and excellentproperties, the controlled rheological PP(CRPP) chips containing high molecular weight additive must beused. The structure of the as-spun filament ought to have the smectic crystal form, lower crystallinity andmoderate orientation. The false twist texturing temperature and the critical temperature produced the closepoints are lower than ordinary PP filament. With the increasing of the texturing temperature, the crimp sta-ble has come to the maxium, the fracture strength and elongation decrease while the close point numbers in-crease gradually.