非等温粘弹性熔体挤出成型过程的形态及性能  

Extrusion Process Morphology and Performance of Non-Isothermal Viscoelastic Melt

作　　者：王磊[1] 陈淮[1] 马晓建[1] 杨崇倡[1] 甘学辉[1] 

机构地区：[1]东华大学机械工程学院,上海201620

出　　处：《高分子材料科学与工程》2014年第1期44-47,共4页Polymer Materials Science & Engineering

基　　金：上海市教育委员会科研创新重点项目(12ZZ066);高等学校博士学科点专项科研基金(10W10324);中央高校基本科研业务费资助项目;教育部创新团队发展计划

摘　　要：对粘弹性流体,非均匀的径向温度所造成的不均匀的径向应力,使熔体在挤出过程中产生非均匀结晶和纤维微观结构的改变。采用PTT模型,通过POLYFLOW软件模拟PA6熔体从圆形喷丝微孔中挤出的流动行为,分析熔体在不同的卷绕速度下沿纺程的拉伸速率分布、温度分布及结晶度的变化情况。结果表明,沿纺程纤维中心和纤维表面的速度几乎重合,在纤维横向断面上拉伸速率是均匀的,而且卷绕速度越低,拉伸速率越容易达到稳定;沿纺程纤维中心温度要高于纤维表面温度,且卷绕速度对纺程上的温度影响不大。研究结论对实际纤维产品和纺丝生产工艺有较好的参考作用。For viscoelastic fluid, the non-uniform radial stress caused by non-unifo~ radial temperature made the non-uniform crystallization and the change of fiber microstructure for viscoelastic, melt. Using PTT viscoelastic constitutive equation, the flow behavior of PA6 melt was simulated by POLYFLOW software. The stretching rate distribution, temperature distribution and crystallinity of PA6 melt along the spinning path with different winding speeds were analyzed. The simulation results show that the speeds of fiber center and fiber surface are almost coincldent. The stretching rate is uniform in the fiber cross-section, and the low winding speed is conducive to the convergence of stretching rate. Fiber center temperature is higher than the fiber surface temperature, and winding speed has a little effect on the temperature. These results provide a theoretical basis for the polymer melt spinning.

关 键 词：卷绕速度 结晶度 圆形微孔 模拟 

分 类 号：O631.21[理学—高分子化学]