1. Influence of microwave heating on the polymerization kinetics and application properties of the PMMA dental materials
- Author
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Sava J. Velickovic, Pavle Spasojević, Jelena Jovanovic, and Borivoj Adnađević
- Subjects
Absorption of water ,Materials science ,Polymers and Plastics ,Kinetics ,dental polymers ,macromolecular substances ,02 engineering and technology ,Isothermal process ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Polymer chemistry ,Materials Chemistry ,Methyl methacrylate ,infrared spectroscopy ,technology, industry, and agriculture ,kinetics(polym) ,Solution polymerization ,030206 dentistry ,General Chemistry ,021001 nanoscience & nanotechnology ,Rate-determining step ,hardness ,Surfaces, Coatings and Films ,Monomer ,chemistry ,Chemical engineering ,Polymerization ,0210 nano-technology - Abstract
The effects of heating mode (conventional isothermal heating (CIH) and microwave isothermal heating (MWIH) on the kinetics of polymerization and the properties important for the application (residual monomer, hardness, and water absorption) of three commercial poly(methyl methacrylate) (PMMA) base dental materials were investigated. The degree of monomer conversion was determined by infrared spectrometry. The hardness of the polymerized samples was measured by shore D method, whereas the water absorption was measured gravimetrically. Kinetics models for polymerizations using different heating modes were determined by model fitting method. The rate of the MWIH polymerization was eight times higher compared with the CIH polymerization. The CIH polymerization is found to be the phase–boundary controlled reaction for which the rate of contracting volume is the rate limiting step, whereas MWIH polymerization is found to be the first-order reaction and the monomer concentration in the polymerization mixture is the rate limiting step. The samples of PMMA base dental materials synthesized by MWIH polymerization exhibit better application properties (hardness and water absorption). © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
- Published
- 2010
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