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Polymerization of multifunctional methacrylates and acrylates.
1Department of Dental Materials and Devices, Fukuoka Dental College, Japan.
Journal of Biomedical Materials Research
|November 1, 1988
Summary
Monomer structure significantly impacts polymerization. Longer, flexible chains and aliphatic units enhance cross-linking efficiency (Ec) and extent of polymerization (Ep), leading to lower residual monomer (Rm).
Area of Science:
- Polymer Chemistry
- Materials Science
Background:
- Understanding monomer structure-property relationships is crucial for developing advanced polymers.
- Cross-linking reactions dictate the final network properties of polymers.
Purpose of the Study:
- To investigate the relationship between chemical structure and polymerization characteristics of various dimethacrylates, trimethacrylate, and diacrylates.
- To determine how monomer chain length and flexibility influence cross-linking efficiency and extent of polymerization.
Main Methods:
- Differential Scanning Calorimetry (DSC) for measuring extent of polymerization (Ep).
- High-Performance Liquid Chromatography (HPLC) for quantifying residual monomer (Rm).
- Calculation of pendant double bonds (Dp) and cross-linking efficiency (Ec) from Ep and Rm.
Main Results:
- Extent of polymerization (Ep) and cross-linking efficiency (Ec) increased with longer aliphatic chains between functional groups.
- Aliphatic monomers polymerized more readily than aromatic ones.
- Diacrylates exhibited higher polymerization rates than corresponding dimethacrylates.
Conclusions:
- Monomer flexibility, influenced by chain length and aliphatic/aromatic content, is key to polymerization characteristics.
- Thermal scanning polymerization generally yielded higher Ep than isothermal polymerization.
- Structure-property correlations provide insights for designing monomers with desired polymerization behavior.