Effect of ring-opening polymerization condition on the characteristic and mechanical properties of hydroxyapatite/poly(ethylene glutarate) biomaterials.
Preparation of hydroxyapatite/poly(ethylene glutarate) (HAp/PEG) composites was carried out by ring-opening polymerization (ROP) of cyclic oligo(ethylene glutarate) in porous HAp scaffolds using various reaction temperatures and times. The content of ROP-PEG interpenetrated into the porous HAp scaffold was about 13-18 wt % with the values of number average molecular weight (overline_M{n}) and weight average molecular weight (overline_M{W}) of 2120-3630 and 2760-5250 g/mol, respectively. The increase in polymerization time and temperature brought about increase in molecular weight of ROP-PEG, but decrease in its content. Compressive strength and compressive modulus of the HAp/PEG composites were about 5.8-20.1 and 105-208 MPa, respectively. These mechanical properties depend upon the effects of distribution, content, and molecular weight of ROP-PEG in the composites. In vitro bioactivity of the HAp/PEG composites was studied by soaking them in simulated body fluid (SBF) for 28 days. The formation of HAp nanocrystal on the composite surfaces through the consumption of calcium and phosphorus from the SBF solution was observed after soaking, indicating the bioactivity of these HAp/PEG composites.
Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand.
Pathavuth
P
Monvisade
Punnama
P
Siriphannon
Walailak
W
Tapcharoen
D001672:Biocompatible Materials / Q000138:chemical synthesis / Q000737:chemistry*; D001826:Body Fluids; D002130:Calcium Phosphates; D019245:Compressive Strength; D008422:Materials Testing; D008970:Molecular Weight; D053758:Nanoparticles; D011095:Polyethylenes / Q000138:chemical synthesis*
D001672:Biocompatible Materials; D002130:Calcium Phosphates; D011095:Polyethylenes