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Investigation of mechanical, dynamic mechanical, rheological and morphological properties of blends based on polypropylene (PP) and cyclic olefin copolymer (COC)
European Polymer Journal ( IF 6 ) Pub Date : 2018-11-01 , DOI: 10.1016/j.eurpolymj.2018.09.030
Aravinthan Gopanna , Selvin P. Thomas , Krishna Prasad Rajan , Rathish Rajan , Egidija Rainosalo , Janez Zavašnik , Murthy Chavali

Abstract Melt-mixing of immiscible polymers can form a broad range of heterogeneous blend system. In this study, polypropylene (PP)/cyclic olefin copolymer (COC) blends were processed in a co-rotating twin screw extruder by melt processing technique. PP/COC blends were prepared without compatibilizer as COC is expected to be compatible with polypropylene due to its olefinic behaviour. Effects of COC blending with PP on mechanical, dynamic mechanical, rheological and morphological behaviour were investigated thoroughly. An increasing fraction of stiffened COC in the PP/COC blends is responsible for the enhancement of tensile strength and modulus, flexural strength and modulus and of a decrease in the elongation at break and impact energy. Various blend system models, such as Parallel, Series, Coran, Takayanagi, Kerner and Halpin Tsai models, have been used to predict tensile strength and modulus and compared with experimental data. When COC is added, shear viscosity of PP/COC blends increases compared to pure PP. The high shear rheological behaviour of PP/COC blends displayed non-Newtonian and shear-thinning behaviour. Shear viscosity as functions of blend composition shows negative deviation from the expected log linearity. DMA results established immiscibility of PP and COC in the blend system, by providing independent glass transition (Tg) for PP and COC component. Scanning electron microscopy results revealed fibrillar morphology for PP/COC blends and co-continuous behaviour in the PP50/COC50 blend composition. The intention of the prepared PP/COC blends is to enhance polypropylene properties by forming COC co-continuous phase, which should impart to the polypropylene phase higher tensile strength, tensile modulus, flexural strength and flexural modulus. The application of optimized PP/COC blend composition is to fabricate dimensionally stable artifacts compared to that of pure PP.

中文翻译:

研究基于聚丙烯 (PP) 和环烯烃共聚物 (COC) 的共混物的机械、动态机械、流变和形态特性

摘要 不混溶聚合物的熔融混合可形成范围广泛的非均相共混体系。在这项研究中,聚丙烯(PP)/环烯烃共聚物(COC)共混物在同向旋转双螺杆挤出机中通过熔融加工技术进行加工。PP/COC 共混物是在没有增容剂的情况下制备的,因为由于其烯烃行为,预计 COC 与聚丙烯相容。彻底研究了 COC 与 PP 共混对机械、动态机械、流变和形态行为的影响。PP/COC 共混物中硬化 COC 比例的增加导致拉伸强度和模量、弯曲强度和模量的提高以及断裂伸长率和冲击能的降低。各种混合系统模型,如Parallel、Series、Coran、Takayanagi、Kerner和Halpin Tsai模型,已被用于预测拉伸强度和模量,并与实验数据进行比较。当添加 COC 时,与纯 PP 相比,PP/COC 混合物的剪切粘度增加。PP/COC 混合物的高剪切流变行为表现出非牛顿和剪切稀化行为。作为混合物组成函数的剪切粘度显示出与预期对数线性的负偏差。通过为 PP 和 COC 组分提供独立的玻璃化转变 (Tg),DMA 结果确定了 PP 和 COC 在共混体系中的不混溶性。扫描电子显微镜结果揭示了 PP/COC 共混物的原纤维形态和 PP50/COC50 共混物组合物中的共连续行为。制备的 PP/COC 共混物的目的是通过形成 COC 共连续相来增强聚丙烯性能,这应该赋予聚丙烯相更高的拉伸强度、拉伸模量、弯曲强度和弯曲模量。与纯 PP 相比,优化的 PP/COC 共混组合物的应用是制造尺寸稳定的工件。
更新日期:2018-11-01
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