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Vinyl sulfonamide based thermosetting composites via thiol-Michael polymerization
Jasmine Sinha1, Adam Dobson1, Osamah Bankhar1
1Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO, United States.
New thiol-Michael dental composites offer improved stability and lower water sorption compared to conventional methacrylate systems. These ester-free composites demonstrate enhanced functional group conversion and tunable properties for advanced dental applications.
Area of Science:
- Polymer Chemistry
- Materials Science
- Biomaterials
Background:
- Conventional dental composites often suffer from water sorption and limited stability.
- Thiol-Michael photocurable systems offer an alternative polymerization mechanism with potential advantages.
Purpose of the Study:
- To evaluate the performance of novel thiol-Michael photocurable composites.
- To compare their properties against traditional BisGMA-TEGDMA methacrylate composites.
- To investigate the influence of monomer structure and filler loading on composite properties.
Main Methods:
- Development of thiol-Michael composites using ester-free thiols and vinyl sulfonamides.
- Incorporation of thiolated microfiller.
- Assessment of polymerization kinetics (FTIR), resin viscosity (rheometry), water uptake, thermomechanical properties (DMA), and mechanical properties (flexural testing).
Main Results:
- Thiol-Michael resins exhibited higher functional group conversion than BisGMA-TEGDMA.
- Significant differences in water sorption were observed between secondary and tertiary vinyl sulfonamide composites.
- Increased glass transition temperature and toughness were achieved with rigid monomer incorporation.
- Ambient curing yielded glassy thiol-Michael composites.
Conclusions:
- Thiol-Michael composites demonstrate promising properties for dental applications.
- These novel resins offer potential for improved structural uniformity, enhanced stability, and reduced water sorption.
- Tailoring monomer structure and filler content allows for property optimization.
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