Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23121
Title: Dynamic mechanical properties and in vitro bioactivity of PHBHV/HA nanocomposite
Authors: Chen, DZ
Tang, CY 
Chan, KC 
Tsui, CP 
Yu, PHF
Leung, MCP
Uskokovic, PS
Keywords: Nanostructures
Polymer-matrix composites (PMCs)
Bioactivity
Mechanical properties
Issue Date: 2007
Publisher: Pergamon Press
Source: Composites science and technology, 2007, v. 67, no. 7-8, p. 1617-1626 How to cite?
Journal: Composites science and technology 
Abstract: Biopolymer composite materials for potential medical applications are of current research interest. In this study, a nanocomposite based on bioresorbable polymer-poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBHV) was prepared by the incorporation of nano-sized hydroxyapatite (nano-HA) using a solution casting method. Homogeneous distribution of nanoparticles in the polymer matrix was validated by the observation of field emission scanning electron microscope (FE-SEM). The dynamic mechanical properties, thermal properties, and bioactivity of the nanocomposite were examined by using varieties of techniques including dynamic mechanical analyser (DMA), differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA), scanning electron microscope coupled with energy dispersive X-ray analysis detector (SEM + EDXA), Fourier transforms infra-red spectrometer (FT-IR) and thin-film X-ray diffractometer (TF-XRD). The results indicated that the storage modulus (E??) of PHBHV was considerably improved with the introduction of nano-HA. For an instance of examination at 1 Hz, the PHBHV/HA (100/30) nanocomposite showed an increment of 41.2% at -50 ?XC and 99.1% at 75 ?XC in E?? as compared with the polymer matrix. It was also found that higher testing frequencies used induce more elastic-like behavior. With the increase in the amount of nano-HA, both the glass transition temperature (T g) and the activation energy (?GE) for the glass transition increased, while the tangent of loss angle (tan ?_) decreased due to the hindrance of the nanofillers to the mobility of the polymer segments. The thermal experiments revealed that, when incorporating HA nanoparticles, the decomposition of the polymer matrix was accelerated at the initial stage but postponed thereafter. The addition of nano-HA also resulted in a decrement in the melting enthalpy of PHBHV. The in vitro investigation indicated that the nanocomposite has an
URI: http://hdl.handle.net/10397/23121
ISSN: 0266-3538
EISSN: 1879-1050
DOI: 10.1016/j.compscitech.2006.07.034
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