title: Preparation of hydroxyapatite/poly(methyl methacrylate) and calcium silicate/poly(methyl methacrylate) interpenetrating hybrid composites.
abstract: Hydroxyapatite/poly(methyl methacrylate) (HAp/PMMA) and calcium silicate/poly(methyl methacrylate) (CS/PMMA) composites were prepared by interpenetrating bulk polymerization of methyl methacrylate (MMA) monomer in porous structures of HAp and CS. The porous HAp and CS templates were prepared by mixing their calcined powders with poly(vinyl alcohol) (PVA) solution, shaping by uniaxial pressing and then firing at 1,100 degrees C for HAp and 900 degrees C for CS. The templates were soaked in the solution mixture of MMA monomer and 0.1 mol% of benzoyl peroxide (BPO) for 24 h. The pre-composites were then bulk polymerized at 85 degrees C for 24 h under nitrogen atmosphere. The microstructures of the composites showed the interpenetrating of PMMA into the porous HAp and CS structures. Thermogravimetric analysis indicated that the PMMA content in the HAp/PMMA and CS/PMMA composites were 13 and 26 wt%, respectively. Weight average molecular weights (M(w)) of PMMA were about 491,000 for HAp/PMMA composites and about 348,000 for CS/PMMA composites. Compressive strengths of these composites were about 90-131 MPa in which they were significantly higher than their starting porous templates.
authors.affiliation: Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok 10520, Thailand.
authors.forename: Pathavuth
authors.initials: P
authors.lastname: Monvisade
authors.forename: Punnama
authors.initials: P
authors.lastname: Siriphannon
authors.forename: Rapee
authors.initials: R
authors.lastname: Jermsungnern
authors.forename: Sirirat
authors.initials: S
authors.lastname: Rattanabodee
mesh_terms: D001672:Biocompatible Materials / Q000138:chemical synthesis; D001843:Bone Cements / Q000138:chemical synthesis / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry*; D019245:Compressive Strength; D017886:Durapatite / Q000737:chemistry*; D008422:Materials Testing; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D016062:Porosity; D017640:Silicates / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D001843:Bone Cements; D017610:Calcium Compounds; D011108:Polymers; D017640:Silicates; D019904:Polymethyl Methacrylate; D017886:Durapatite; C031293:calcium silicate