Highly Enhanced Mechanical Properties of Polypropylene-Long Carbon Fiber Composites by a Combined Method of Coupling Agent and Surface Modification of Long Carbon Fiber

다국어 초록 (Multilingual Abstract)

The aim of this study was to enhance the mechanical strengths of polypropylene/long carbon fiber thermoplastic(PP/LCFT) composite by increasing the adhesion between the PP matrix and the long carbon fiber (LCF).
Bi-functional group grafted polypropylene (BFPP) was used as a coupling agent with surface modified LCF (SMLCF) ina long fiber thermoplastic (LFT) melt impregnation system to increase the interaction between the PP matrix and theLCF. The BFPP was produced by melt compounding of maleic anhydride grafted polypropylene (MAPP) and polyetheramine (PEA). The surface modified LCF (SMLCF) was produced by dipping LCF into a sizing bath with 3-methacryloxypropyltrimethoxysilane (MPTS) to obtain oxygen functional groups. The composites were producedwith a LFT melt impregnation system with PP, BFPP, and SMLCF. Tensile and flexural tests and scanning electronmicroscopy (SEM) results of the PP/BFPP/SMLCFT composite showed significantly enhanced mechanical strengths,compared with those of the common PP/LCF composite with a conventional maleic anhydride grafted polypropylene(MAPP) coupling agent. These improvements in mechanical properties are attributed to better fiber/matrix interfacialadhesion, as confirmed by micro droplet specimen tests and SEM micrographs of the fracture surface afterinter laminar shear testing. The PP/SMLCFT composite with BFPP 5 wt% as coupling agent showed the highesttensile strength and flexural strength, which increased by 1.5 times and 1.7 times respectively, compared with PP/LCFT with a conventional MAPP coupling agent. The composite produced by this effective combination method ofa coupling agent and surface modification of long carbon fiber can potentially be applied to automobile materials,leading to the replacement of metal parts and car weight reduction.

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