作　　者： ; ; ;

机构地区： 上海交通大学化学化工学院

出　　处： 《合成纤维》 2004年第2期4-6,共3页

摘　　要： 使用毛细管流变仪研究了PTT熔体在单轴拉伸流场中的流变性能。结果表明,PTT熔体拉伸流动属于拉伸变稀型,熔体的拉伸粘度随拉伸应力增加而降低,随相对分子质量提高,熔体的拉伸变稀现象更加明显。熔体的相对分子质量越高,拉伸速率对熔体的拉伸粘度影响越大。随拉伸速率提高,熔体的拉伸应力增大,拉伸粘度减小,易产生拉伸共振现象。因此,PTT熔体纺丝时应该采取较低的喷头拉伸倍数,即适当提高熔体挤出时的纺丝速度,或降低卷绕速度,以此降低熔体拉伸比和防止拉伸共振现象,改善纺丝成形的稳定性。 The Theological properties of poly(trimethylene terephthalate) melt in uniaxial extension were studied by using capillary rheometer. The results showed that the extensional viscosity decreased with increasing the extensional stress, which b ecame more obvious with increasing the molecular weight of PIT melt. With increa sing the molecular weight of PTT melt, the extensional strain rate affected sign ificantly the extensional viscosity of melt. The extensional stress increased an d the extensional viscosity decreased with increasing the extensional strain rat e, which might easily form the draw resonance in melt-spinning processing of PTT melt. It was very important to decrease spinneret draft in melt-spinning proces sing of PTT melt in order to decrease draw resonance and improve the spinnabilit y.

关 键 词： 聚对苯二甲酸丙二酯熔体 单轴拉伸流场 拉伸共振 可纺性 毛细管流变仪 流变性能

领　　域： [化学工程]