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Application of supercritical CO2 as the processing medium to tune impact fracture behavior of polypropylene/poly(ethylene-co-octene) blends

机译：超临界二氧化碳作为曲调聚丙烯/聚（乙烯 - 辛烯）共混物的抗冲击断裂行为的应用

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摘要

The objective of the present work is to study the effectiveness of the application of scCO(2) as the processing medium to tune the fracture behavior of polypropylene/poly(ethylene-co-octene) (PP/POE) blends. Three types of POE were selected to blend with PP to test the feasibility of this approach. A tandem extrusion system was employed for the thermal blending of PP/POE blends, and an integrated slit die rheometer was used to measure the viscosity of pure PP and POE without or with scCO(2) for viscosity ratio calculation. Scanning electron microscopy (SEM) was applied to investigate the phase dispersion and also the fractured morphologies after impact tests. The notched Izod impact tests were carried out at different temperatures to confirm the effectiveness of application of scCO(2) on the alteration of the fracture behavior of PP/POE blends. It was found that PP has a higher affinity for scCO(2) than POE does, and that consequently, for POE originally with a lower apparent viscosity than PP, the phase dispersion of the PP/POE blends was improved upon injection of scCO(2), and thus the fracture behavior alteration from brittle to tough was observed at suitable temperatures. In comparison, for POE originally with a higher apparent viscosity than PP, the phase domains of the PP/POE blends were increased in size upon injection of scCO(2), and resultantly, the fracture mode transition from tough to brittle was observed at suitable temperatures. Hence, this study confirmed the effectiveness of application of scCO(2) to tune the fracture behavior of PP/POE blends, which is of great significance from both fundamental and industrial perspectives.
机译：本作作品的目的是研究SCCO（2）作为处理介质的应用施加聚丙烯/聚（乙烯 - 辛烯）（PP / POE）共混物的裂缝行为。选择三种类型的POE以与PP混合以测试该方法的可行性。使用串联挤出系统用于PP / POE共混物的热混合，并且使用集成的狭缝模流量计测量纯PP和POE的粘度，而不是用于粘度比计算的SCCO（2）。扫描电子显微镜（SEM）被应用于研究激发试验后的相分散性和裂缝形态。在不同的温度下进行缺口的Izod冲击试验，以确认SCCO（2）在PP / POE共混物的断裂行为改变的效果的有效性。发现PP对SCCO（2）具有比PoE更高的亲和力，并且因此对于最初具有比PP的表观粘度较低的POE，注射SCCO时，PP / POE共混物的相分散得到改善（2 ），因此在合适的温度下观察到从脆性到坚韧的裂缝行为改变。相比之下，对于最初具有比PP更高的表观粘度的POE，在注射SCCO（2）时，PP / POE共混物的相位域尺寸增加，并且结果，在合适的情况下观察到抗脆性的裂缝模式过渡。温度。因此，本研究证实了SCCO（2）施加PP / POE混合物的裂缝行为的有效性，这对基本和工业观点来说具有重要意义。

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  • 来源
    《RSC Advances》 |2016年第108期|共8页
  • 作者

    Wang Kun; Pang Yongyan; Huang Pengke; Zhang Lihua; Liu Wei; Zheng Wenge;

  • 作者单位

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn Polymers &

    Composites Div Ningbo Key Lab Polymer Mat Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn Polymers &

    Composites Div Ningbo Key Lab Polymer Mat Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn Polymers &

    Composites Div Ningbo Key Lab Polymer Mat Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn Polymers &

    Composites Div Ningbo Key Lab Polymer Mat Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn Polymers &

    Composites Div Ningbo Key Lab Polymer Mat Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Ningbo Inst Mat Technol &

    Engn Polymers &

    Composites Div Ningbo Key Lab Polymer Mat Ningbo 315201 Zhejiang Peoples R China;

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