Analysis of row nucleated lamellar morphology of polypropylene obtained from the cast film process: Effect of melt rheology and process conditions
Analysis of row nucleated lamellar morphology of polypropylene obtained from the cast film process: Effect of melt rheology and process conditions
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DOI：
10.1002/pen.20837
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发表时间：
2007-07
影响因子：
3.2
通讯作者：
F. Sadeghi;A. Ajji;P. Carreau
中科院分区：
文献类型：
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作者：
F. Sadeghi;A. Ajji;P. Carreau
采用流变学方法对5种不同的聚丙烯树脂进行了表征，研究了熔体流变学对铸膜过程中排核片层结构发展的影响。采用广角x射线衍射（WAXD）和傅里叶变换红外（FTIR）方法研究了晶体和非晶相的排列和取向。进行了拉伸试验，以检验取向对样品行为的影响。研究发现，从流变学角度评估的分子量和加工条件对结晶相和非晶相的取向起着至关重要的作用，进而显著影响拉伸响应。分子量是控制取向的主要参数，随着拉伸比的增大，分子量越大的树脂倾向于形成平面结晶形态。还观察到，在拉伸测量中，平面形貌与屈服行为的抑制有关。变异较大。ENG。科学。中文信息学报，47(7):1170 - 1178,2007。©2007塑料工程师协会
Five different polypropylene resins were characterized by rheology to study the effect of melt rheology on the row-nucleated lamellar structure development during the cast film process. The arrangement and orientation of the crystalline and amorphous phases were examined by WAXD (wide angle X-ray diffraction) and FTIR (Fourier transform infrared) methods. Tensile tests were carried out to examine the effect of orientation on the behavior of the samples. It was found that the molecular weight evaluated from rheology and the processing conditions played a crucial role on the orientation of the crystalline and amorphous phases and, in turn, affected significantly the tensile response. The molecular weight was the main parameter that controlled the orientation and it was found that the resin with a higher molecular weight had a tendency to form a planar crystalline morphology as the draw ratio increased. It was also observed that a planar morphology was associated with a suppression of the yield behavior in the tensile measurements. POLYM. ENG. SCI., 47:1170–1178, 2007. © 2007 Society of Plastics Engineers