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Issue 108, 2016
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Application of supercritical CO2 as the processing medium to tune impact fracture behavior of polypropylene/poly(ethylene-co-octene) blends

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Abstract

The objective of the present work is to study the effectiveness of the application of scCO2 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 scCO2 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 scCO2 on the alteration of the fracture behavior of PP/POE blends. It was found that PP has a higher affinity for scCO2 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 scCO2, 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 scCO2, and resultantly, the fracture mode transition from tough to brittle was observed at suitable temperatures. Hence, this study confirmed the effectiveness of application of scCO2 to tune the fracture behavior of PP/POE blends, which is of great significance from both fundamental and industrial perspectives.

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

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Publication details

The article was received on 02 Oct 2016, accepted on 01 Nov 2016 and first published on 02 Nov 2016


Article type: Paper
DOI: 10.1039/C6RA24547A
Citation: RSC Adv., 2016,6, 106347-106354
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    Application of supercritical CO2 as the processing medium to tune impact fracture behavior of polypropylene/poly(ethylene-co-octene) blends

    K. Wang, Y. Pang, P. Huang, L. Zhang, W. Liu and W. Zheng, RSC Adv., 2016, 6, 106347
    DOI: 10.1039/C6RA24547A

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