Interfacial engineering of polypropylene/graphene nanocomposites: improvement of graphene dispersion by using tryptophan as a stabilizer

Abstract : In this work, graphene nanosheets functionalized with polypropylene (PP) chains through non-covalent pi-pi interactions, PP-f-graphene, were prepared and their reinforcing effect on PP was investigated. With the aid of tryptophan, graphene can stably disperse in water due to the non-covalent pi-pi interactions between graphene and tryptophan. By mixing the aqueous dispersion of tryptophan-functionalized graphene and the xylene solution of polypropylene-graft-maleic anhydride (MAPP), a binary phase system was obtained. The graphene nanosheets continuously transferred from water phase into xylene phase as the reaction between MAPP and tryptophan at the water/oil interface proceeded. The structure of the resultant PP-f-graphene nanosheets was carefully characterized by spectroscopy and microscopy methods. The results confirmed that MAPP chains have been successfully bonded onto graphene surfaces. PP/PP-f-graphene nanocomposites were fabricated by melt blending. A well-dispersed PP-f-graphene in PP matrix was realized due to the strong adsorption between graphene and functionalized PP. The addition of only 0.6 wt% of PP-f-graphene increased the tensile strength and flexural modulus of PP by 20.8% and 44.6%, respectively. The crystallization temperature and rate of PP were also elevated by the incorporation of PP-f-graphene. Making use of the interaction between graphene and functionalized PP is a facile method to improve the dispersion of graphene in the PP matrix.
Type de document :
Article dans une revue
RSC Advances, Royal Society of Chemistry, 2014, 4 (17), pp.8799-8807. 〈10.1039/c3ra47112h〉
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Soumis le : vendredi 19 février 2016 - 16:47:15
Dernière modification le : jeudi 11 janvier 2018 - 06:25:27

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Feng You, Dongrui Wang, Xinxin Li, Meijing Liu, Guo-Hua Hu, et al.. Interfacial engineering of polypropylene/graphene nanocomposites: improvement of graphene dispersion by using tryptophan as a stabilizer. RSC Advances, Royal Society of Chemistry, 2014, 4 (17), pp.8799-8807. 〈10.1039/c3ra47112h〉. 〈hal-01276638〉

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