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Abstract:

The polycondensation of (3-methacryloxypropyl)-trimethoxysilane in acidic conditions using different methacrylate monomers as reactive solvents resulted in incompletely condensed methacrylate-functionalized silsesquioxanes with a very large fraction of intramolecular cycles. UV-MALDI-TOF-MS analysis demonstrated that the species present after 2 weeks of reaction at 60 °C were: T6(OH)2, T7(OH), T8(OH) 2, T9(OH), T10(OH)2 and T 11(OH). Analysis of samples after 30 months of storage at room temperature revealed the presence of T12(OH)2 and T 13(OH) species. The absence of higher molar mass oligomers after prolonged storage periods is attributed to dilution of the reacting medium, which discourages bimolecular reactions that lead to polymer growth. 29Si NMR spectroscopy showed that the conversion in the polycondensation reaction was in the range 0.91-0.96. The methacrylate monomers are not involved in the hydrolysis-condensation reactions with MPTMS and therefore can be polymerized by thermal or photochemical means, thereby cross-linking the preformed nanosized cagelike silsesquioxanes. The formulations containing silsesquioxanes showed a markedly reduced content of extractable monomer after photopolymerization, which makes these resins very attractive for dental filling materials. © 2010 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Synthesis of silsesquioxanes based in (3-methacryloxypropyl)- trimethoxysilane using methacrylate monomers as reactive solvents
Autor:Asmussen, S.V.; Giudicessi, S.L.; Erra-Balsells, R.; Vallo, C.I.
Filiación:Institute of Materials Science and Technology (INTEMA), University of Mar Del Plata, CONICET, Juan B Justo 4302, 7600 Mar del Plata, Argentina
CIHDECAR-CONICET, Departamento de Química Orgánica, Ciudad Universitaria, (1428) Ciudad Autónoma de Buenos Aires, Argentina
Palabras clave:Dental resins; Nanocomposites; Photopolymerization; Silsesquioxanes; Acidic conditions; Bimolecular reaction; Dental filling; Dental resins; Functionalized; MALDI-TOF-MS analysis; Methacrylate monomers; Nano-sized; NMR spectroscopy; Polycondensation reactions; Polymer growth; Reactive solvent; Room temperature; Silsesquioxanes; Storage periods; Trimethoxysilane; Dental prostheses; Filling; Monomers; Nanocomposites; Nuclear magnetic resonance spectroscopy; Oligomers; Photopolymerization; Polycondensation; Resins; Synthesis (chemical); Condensation reactions
Año:2010
Volumen:46
Número:9
Página de inicio:1815
Página de fin:1823
DOI: http://dx.doi.org/10.1016/j.eurpolymj.2010.06.006
Título revista:European Polymer Journal
Título revista abreviado:Eur Polym J
ISSN:00143057
CODEN:EUPJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00143057_v46_n9_p1815_Asmussen

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Citas:

---------- APA ----------
Asmussen, S.V., Giudicessi, S.L., Erra-Balsells, R. & Vallo, C.I. (2010) . Synthesis of silsesquioxanes based in (3-methacryloxypropyl)- trimethoxysilane using methacrylate monomers as reactive solvents. European Polymer Journal, 46(9), 1815-1823.
http://dx.doi.org/10.1016/j.eurpolymj.2010.06.006
---------- CHICAGO ----------
Asmussen, S.V., Giudicessi, S.L., Erra-Balsells, R., Vallo, C.I. "Synthesis of silsesquioxanes based in (3-methacryloxypropyl)- trimethoxysilane using methacrylate monomers as reactive solvents" . European Polymer Journal 46, no. 9 (2010) : 1815-1823.
http://dx.doi.org/10.1016/j.eurpolymj.2010.06.006
---------- MLA ----------
Asmussen, S.V., Giudicessi, S.L., Erra-Balsells, R., Vallo, C.I. "Synthesis of silsesquioxanes based in (3-methacryloxypropyl)- trimethoxysilane using methacrylate monomers as reactive solvents" . European Polymer Journal, vol. 46, no. 9, 2010, pp. 1815-1823.
http://dx.doi.org/10.1016/j.eurpolymj.2010.06.006
---------- VANCOUVER ----------
Asmussen, S.V., Giudicessi, S.L., Erra-Balsells, R., Vallo, C.I. Synthesis of silsesquioxanes based in (3-methacryloxypropyl)- trimethoxysilane using methacrylate monomers as reactive solvents. Eur Polym J. 2010;46(9):1815-1823.
http://dx.doi.org/10.1016/j.eurpolymj.2010.06.006