Abstract
Various multicomponent polyethylene/rubber/filler composites have been characterized by diffuse reflectance infrared spectroscopy (DRIFT) and notched lzod impact testing. This work is part of a study which also included solid state and melt state dynamic mechanical testing of the same composites. The fillers used were an oxidized silicon powder and calcium carbonate. Fillers were also treated with coupling agents gamma -ami nopropyltriethoxysilane (γ-APS) and gamma -methacryloxypropyltrimoethoxysilan8 (γ-MPS). The rubbers were ethylene propylene diene (EPDM) rubber and a maleic anhydride grafted EPDM (EPDM-MA). DRIFT is useful for investigating the structure of these multicomponent composites on the molecular level. The DRIFT technique was used to confirm the presence of γ-MPS in the final composites treated with that coupling agent. The structure of the maleic anhydride functionality of @ maleic anhydride grafted EPDM was also determined. The DRIFT analysis detected a reaction between the maleic anhydride modification of the EPDM and γ-APS during processing on the roll mill to form the cyclic imide structure. This is useful in interpreting a great deal of the dynamic mechanical results. The lzod impact testing shows that impact properties of both the oxidized silicon powder and calcium carbonate composites are improved by rubber addition. The use of EPDM-MA results in greater improvement than EPDM. This is likely due to greater filler-rubber interactions in the case of EPDM-MA which leads to encapsulation of the filler by the rubber due to favourable interfacial interactions. Comparison of the storage modulusG′ at room temperature and lzod impact values was made for the PE/rubber/filler composites and the PE/filler and PE/rubber composites investigated in this study. Proper design of multiconmponent PE/rubber/filler composites may clearly result in higher modulus and higher impact strength than that which is available with two phase PE/filler or PE/rubber systems.
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Scott, C., Ishlda, H. & Maurer, F.H.J. Infrared analysis and Izod impact testing of multicomponent polymer composites: polyethylene/ EP D M /filler systems. J Mater Sci 22, 3963–3973 (1987). https://doi.org/10.1007/BF01133346
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DOI: https://doi.org/10.1007/BF01133346