Influence of the concentration of 10-metacryloxydecyl dihydrogen phosphate (10-MDP) on the degree of conversion of experimental adhesives applied with different manipulation protocols

• Autor(a) principal: Narimatsu, Mayara Hana
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Biblioteca Digital de Teses e Dissertações da USP
• Texto Completo: https://www.teses.usp.br/teses/disponiveis/25/25148/tde-18112021-153330/
• topic: 10-MDP; 10-metacriloiloxidecil dihidrogêniofosfato (MDP); Adesivo; Adhesive; Água; Degree of conversion; Espectroscopia Transformada de Fourier Infravermelho (FTIR); Evaporação de solventes; Fourier transform infrared spectrophotometer (FTIR); Grau de conversão; Iodonium salt; Solvent evaporation; Water

Purpose: To evaluate the influence of different concentrations of 10-MDP in degree of conversion (%DC) of experimental adhesives (EA) applied with different manipulation protocols (MP). Materials and Methods: EA containing a three-component-photoinitiator system (CQ/DABE/iodonium salt) were prepared and different concentrations of 10-MDP were added A1 = 0%, A2 = 3%, A3 = 6%, A4 = 9%, A5 = 12%, or A6 = 15% by weight. A commercially available adhesive was used as comparison (Ambar, FGM). The adhesives were divided into 4 MP: I) Control (without any manipulation), II) 5 s of evaporation, III) 20 s of evaporation and IV) addition of water to the adhesive. DC was evaluated by FTIR-ATR. The data were analyzed with two-way Anova and Tukey´s HSD ( = 0.05). Results: Significant differences were found between the adhesives (p < 0.0001) and MP (p = 0.000001). An interaction effect (p < 0.0001) was also observed. For adhesives, it was observed that the A5 showed the highest value (89.70% ± 4.21) and the lowest values to EA without MDP (76.35% ± 8.45). Ambar showed intermediate values (83.68% ± 9.46). For MP, the highest DC was observed to Control (88.50% ± 2.72) > 20-s-evaporation (85.13% ± 6.95) 5-s-evaporation (85.18% ± 6.08) addition of water (85.80% ± 10.33). Conclusion: The results suggest that 10- MDP can enhance the %DC of the threecomponent- photoinitiator system EAs evaluated.