Benzodioxoles as alternative coinitiators for radical polymerization in a model‐dental adhesive resin |
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Authors: | Giana da Silveira Lima Fabrício Aulo Ogliari Manuela Gonçalves Souza e Silva Eliseu Aldrighi Münchow Cesar Liberato Petzhold Evandro Piva |
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Affiliation: | 1. Department of Operative Dentistry, School of Dentistry, University of Várzea Grande, Várzea Grande, Brazil;2. Department of Materials Engineering, School of Materials Engineering, Federal University of Pelotas, Pelotas, Brazil;3. Department of Operative Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, Brazil;4. Department of Organic Chemistry, Chemistry Institute, Federal University of Rio Grande do Sul, Porto Alegre, Brazil |
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Abstract: | This study evaluated the effectiveness of benzodioxole derivatives as coinitiators of radical polymerization in a model‐dental adhesive resin. To compose the adhesive resin, a monomer mixture based on 50 wt % of Bis‐GMA, 25 wt % of TEGDMA, and 25 wt % of HEMA was used. Camphorquinone (CQ) 1 mol % was used as a photoinitiator to initiate polymerization. 1,3‐Benzodioxole (BDO) and piperonyl alcohol (PA) were used as coinitiators at 0.25, 0.5, 1, 2, 4, 8, and 16 mol % level. In addition, tertiary amine, ethyl 4‐dimethylamino benzoate (EDAB) was used as coinitiator in the control group. Some physical, chemical, and mechanical properties of the polymer formed in the experimental adhesives were evaluated using the kinetics of polymerization, sorption and solubility, flexural strength, and elastic modulus tests. The results indicated that BDO and PA were effective coinitiators in the photoinitiator system based on CQ. Comparisons between the benzodioxoles derivative coinitiators and EDAB showed similar performance in the kinetics of polymerization and flexural strength. For water sorption and solubility evaluation, BDO and PA demonstrated significantly more sorption of water and less solubility than the EDAB control group. The findings suggest that BDO and PA were feasible alternatives to conventional amine as coinitiator. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 |
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Keywords: | adhesives infrared spectroscopy photopolymerization radical polymerization benzodioxoles amines |
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