Melt rheology of linear and long-chain branched polypropylene blends

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• 作者：Mahshid Maroufkhani ; Nadereh Golshan Ebrahimi
• 关键词：Polypropylene ; Long ; chain branched ; Rheology ; Miscibility ; Molecular Stress Function
• 刊名：Iranian Polymer Journal
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：24
• 期：9
• 页码：715-724
• 全文大小：703 KB
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• 作者单位：Mahshid Maroufkhani (1)
  Nadereh Golshan Ebrahimi (1)
  
  1. Polymer Engineering Department, Chemical Engineering Faculty, Tarbiat Modares University, P.O. Box: 14115-114, Tehran, Iran
  
• 刊物主题：Polymer Sciences; Ceramics, Glass, Composites, Natural Methods;
• 出版者：Springer Berlin Heidelberg
• ISSN：1735-5265

文摘

The miscibility of linear polypropylene (L-PP) and long-chain branched polypropylene (LCB-PP) blends was studied in relation to the rheological behavior in shearing and elongational deformations of the blends. The rheological properties of four commercial L-PPs with different molecular weights were studied by adding 10, 25, 50, and 75 wt% of LCB-PP to L-PP. The linear viscoelastic properties such as complex viscosity and weighted relaxation spectrum were determined as functions of LCB-PP content. According to the obtained rheological data, the LCB-PP showed a higher zero-shear viscosity and a longer relaxation time than the L-PPs. The linear viscoelastic properties showed an increase in the molecular weight and branched content of the L-PP with a reduction in miscibility. Furthermore, good predictions of linear viscoelastic properties for miscible and immiscible blends were achieved by applying the Palierne model. In uniaxial elongational tests, the L-PP showed no strain hardening behavior. By contrast, the addition of 10 wt% LCB-PP to L-PP resulted in strain hardening behavior at all strain rates. Hence, the strain hardening behavior of the blends was enhanced with LCB-PP content. The elongational viscosity data of the L-PP and LCB-PP and their blends were studied by employing the Molecular Stress Function (MSF) model which could predict the strain hardening behavior of the blends. Keywords Polypropylene Long-chain branched Rheology Miscibility Molecular Stress Function