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首页> 外文会议>ASME international mechanical engineering congress and exposition >PROCESSING/STRUCTURE/PROPERTIES RELATIONSHIPS IN POLYMER BLENDS FOR THE DEVELOPMENT OF FUNCTIONAL POLYMER FOAMS
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PROCESSING/STRUCTURE/PROPERTIES RELATIONSHIPS IN POLYMER BLENDS FOR THE DEVELOPMENT OF FUNCTIONAL POLYMER FOAMS

机译：功能性聚合物泡沫塑料在聚合物共混物中的加工/结构/特性关系

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摘要

In this study we present a comprehensive experimental investigation of the effect of polymer blending on the dispersed phase morphology and how the dispersed phase morphology influences the foaming behavior of the semicrystalline polymer matrix using three different material combinations: polyethylene (PE)/polypropylene (PP), PP/polyethylene terephthalate (PET) and PP/polytetrafluoroethylene (PTFE). Samples are prepared such that the dispersed phase domains exhibit either spherical or fibrillated morphologies. Measurements of the uniaxial extensional viscosity, linear viscoelastic properties and crystallization kinetics under ambient pressures and elevated pressures of carbon dioxide (CO_2) are performed and the morphological features are identified with the aid of SEM. Batch foaming and lab-scale extrusion foaming experiments are performed, as a screening model for polymer processing, to show the enhancement of the foaming ability as a result of the blend morphology, taking into account the rheological behaviour and the effects of crystallization kinetics. The formation of high aspect ratio fibrils imparts unique characteristics to the semicrystalline matrix such as strain-hardening in uniaxial extensional flow, prolonged relaxation times, pronounced elastic properties and enhanced kinetics of crystallization. In contrast, the regular blends containing spherical dispersed phase domains do not exhibit such properties. Foam processing of the three blends reveals a marked broadening of the foaming window when the dispersed phase domains are fibrillated due to the concurrent increase in crystallization kinetics, improved elastic properties and strain hardening in extensional flow.
机译：在这项研究中，我们对聚合物共混对分散相形态的影响进行了全面的实验研究，以及使用三种不同的材料组合：聚乙烯（PE）/聚丙烯（PP），分散相形态如何影响半结晶聚合物基质的发泡行为。 ，PP /聚对苯二甲酸乙二酯（PET）和PP /聚四氟乙烯（PTFE）。制备样品以使分散的相域呈现球形或原纤化形态。在环境压力和二氧化碳（CO_2）升高的压力下，进行了单轴拉伸粘度，线性粘弹性和结晶动力学的测量，并借助SEM鉴定了形态特征。进行批量发泡和实验室规模的挤出发泡实验（作为聚合物加工的筛选模型），以考虑到流变行为和结晶动力学的影响，显示出由于共混物形态而提高的发泡能力。高长径比的原纤维的形成赋予半结晶基体独特的特性，例如单轴延伸流中的应变硬化，延长的弛豫时间，明显的弹性和增强的结晶动力学。相反，含有球形分散相域的常规共混物不表现出这样的性质。当分散相域发生原纤化时，由于结晶动力学的同时增加，弹性特性的改善和拉伸流动中的应变硬化，三种共混物的泡沫加工过程显示出发泡窗口的显着加宽。

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