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Introduction of Specific Interaction of Hydroxyapatite/Polylactide Composites  

Kang, Jin-Kyu (Division of Chemical Engineering, Pukyong National University)
Lim, Jun-Heok (Division of Chemical Engineering, Pukyong National University)
Moon, Myong-Jun (Division of Chemical Engineering, Pukyong National University)
Lee, Won-Ki (Division of Chemical Engineering, Pukyong National University)
Kim, Mi-Ra (Department of Polymer Science and Engineering, Pusan National University)
Lee, Jin-Kook (Department of Polymer Science and Engineering, Pusan National University)
Publication Information
Polymer(Korea) / v.33, no.1, 2009 , pp. 13-18 More about this Journal
Abstract
To increase mechanical properties of the hydroxyapatite/poly (L-lactide) (HA/PLLA) composite which was a potential bone substitute material, HA was modified by the surface grafting with D-lactide (DLA) and the formation of stereocomplexes between components was introduced. The composite films were prepared by the solvent-nonsolvent technique to minimize the precipitation of HA during drying. The structure and properties of the composites were investigated by thermal gravimetric analysis (TGA), differential scanning calorimeter, and scanning electron microscopy, and mechanical property measurements. TGA results showed that the amount of DLA grafted on the HA surfaces (g-HA) was 6 wt%. The obtained g-HA exhibited better dispersity in an organic solvent than HA. The formation of stereocomplexes in the composites was confirmed by the change in melting temperature. The mechanical properties of g-HA/PLLA composites were increased, compared to the HA/PLLA composites.
Keywords
hydroxyapatite; poly (l-lactide); surface grafting; stereo complex;
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