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Open AccessArticle

Polypropylene Biocomposites with Boron Nitride and Nanohydroxyapatite Reinforcements

Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
Department of Orthopedics and Traumatology, Li Ka Shing Faculty of Medicine, the University of Hong Kong, Hong Kong
Shenzhen Key Laboratory for Innovative Technology in Orthopedic Trauma, the University of Hong Kong Shenzhen Hospital, 1 Haiyuan 1st Road, Shenzhen 518053, China
Author to whom correspondence should be addressed.
Academic Editor: Amir A. Zadpoor
Materials 2015, 8(3), 992-1008;
Received: 23 January 2015 / Revised: 17 February 2015 / Accepted: 28 February 2015 / Published: 10 March 2015
(This article belongs to the Special Issue Mechanics of Biomaterials)
In this study, we develop binary polypropylene (PP) composites with hexagonal boron nitride (hBN) nanoplatelets and ternary hybrids reinforced with hBN and nanohydroxyapatite (nHA). Filler hybridization is a sound approach to make novel nanocomposites with useful biological and mechanical properties. Tensile test, osteoblastic cell culture and dimethyl thiazolyl diphenyl tetrazolium (MTT) assay were employed to investigate the mechanical performance, bioactivity and biocompatibility of binary PP/hBN and ternary PP/hBN-nHA composites. The purpose is to prepare biocomposite nanomaterials with good mechanical properties and biocompatibility for replacing conventional polymer composites reinforced with large hydroxyapatite microparticles at a high loading of 40 vol%. Tensile test reveals that the elastic modulus of PP composites increases, while tensile elongation decreases with increasing hBN content. Hybridization of hBN with nHA further enhances elastic modulus of PP. The cell culture and MTT assay show that osteoblastic cells attach and proliferate on binary PP/hBN and ternary PP/hBN-20%nHA nanocomposites. View Full-Text
Keywords: boron nitride; hydroxyapatite; nanocomposite; osteoblast; cytotoxicity; hybridization boron nitride; hydroxyapatite; nanocomposite; osteoblast; cytotoxicity; hybridization
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Chan, K.W.; Wong, H.M.; Yeung, K.W.K.; Tjong, S.C. Polypropylene Biocomposites with Boron Nitride and Nanohydroxyapatite Reinforcements. Materials 2015, 8, 992-1008.

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