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Abstract:

A new class of silsesquioxane (SSO), containing species with two to nine Si atoms bearing multiple intramolecular rings formed through Si-O-C bonds, was synthesized as a glassy powder. It was characterized by UV-MALDI-TOF MS, 29Si NMR and FT IR. Solutions containing different amounts of SSO in the diglycidyl ether of bisphenol A (DGEBA), were homopolymerized in the presence of (4-dimethylamino)pyridine (DMAP) as initiator, leading to SSO-modified epoxy networks. SSO species were covalently bonded to the epoxy network without any evidence of phase separation. The SSO addition provoked an increase in the elastic modulus in the glassy state explained by an increase in the cohesive energy density. The SSO addition gave also place to an increase in the intensity of tan δ and a decrease in both the glass transition temperature and the elastic modulus in the rubbery state. This was explained by a decrease in crosslink density associated with the flexibility of SSO structures. DMAP was much more effective than other usual initiators (like benzyldimethylamine, BDMA), in increasing the crosslink density of the resulting epoxy network. This led to high values of the glass transition temperature and the elastic modulus in the rubbery state.

Registro:

Documento: Artículo
Título:Epoxy networks modified by a new class of oligomeric silsesquioxanes bearing multiple intramolecular rings formed through Si-O-C bonds
Autor:Dell'Erba, I.E.; Fasce, D.P.; Williams, R.J.J.; Erra-Balsells, R.; Fukuyama, Y.; Nonami, H.
Filiación:Inst. of Mat. Sci./Technol. (INTEMA), University of Mar del Plata, National Research Council (CONICET), J. B. Justo 4302, 7600 Mar del Plata, Argentina
CIHIDECAR-CONICET, Department of Organic Chemistry, University of Buenos Aires, 1428 Buenos Aires, Argentina
Biochemistry Research Laboratory, College of Agriculture, Ehime University, Matsuyama 790-8566, Japan
Palabras clave:Epoxy; Heteroatom-containing polymers; Networks; Polysiloxanes; Silsesquioxane; Thermosets; Chemical bonds; Elastic moduli; Fourier transform infrared spectroscopy; Glass transition; Homopolymerization; Nuclear magnetic resonance; Phase separation; Synthesis (chemical); Epoxy networks; Glassy powders; Silsesquioxane (SSO); Silicon; 2,2 bis(4 glycidyloxyphenyl)propane; 4 dimethylaminopyridine; 4,4' isopropylidenediphenol; epoxide; silicon derivative; silsesquioxane; unclassified drug; article; cross linking; glass transition temperature; infrared spectroscopy; matrix assisted laser desorption ionization time of flight mass spectrometry; nuclear magnetic resonance spectroscopy; synthesis; young modulus
Año:2004
Volumen:289
Número:4
Página de inicio:315
Página de fin:323
DOI: http://dx.doi.org/10.1002/mame.200300344
Título revista:Macromolecular Materials and Engineering
Título revista abreviado:Macromol. Mater. Eng.
ISSN:14387492
CODEN:MMENF
CAS:2,2 bis(4 glycidyloxyphenyl)propane, 1675-54-3; 4 dimethylaminopyridine, 1122-58-3; 4,4' isopropylidenediphenol, 80-05-7
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14387492_v289_n4_p315_DellErba

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Citas:

---------- APA ----------
Dell'Erba, I.E., Fasce, D.P., Williams, R.J.J., Erra-Balsells, R., Fukuyama, Y. & Nonami, H. (2004) . Epoxy networks modified by a new class of oligomeric silsesquioxanes bearing multiple intramolecular rings formed through Si-O-C bonds. Macromolecular Materials and Engineering, 289(4), 315-323.
http://dx.doi.org/10.1002/mame.200300344
---------- CHICAGO ----------
Dell'Erba, I.E., Fasce, D.P., Williams, R.J.J., Erra-Balsells, R., Fukuyama, Y., Nonami, H. "Epoxy networks modified by a new class of oligomeric silsesquioxanes bearing multiple intramolecular rings formed through Si-O-C bonds" . Macromolecular Materials and Engineering 289, no. 4 (2004) : 315-323.
http://dx.doi.org/10.1002/mame.200300344
---------- MLA ----------
Dell'Erba, I.E., Fasce, D.P., Williams, R.J.J., Erra-Balsells, R., Fukuyama, Y., Nonami, H. "Epoxy networks modified by a new class of oligomeric silsesquioxanes bearing multiple intramolecular rings formed through Si-O-C bonds" . Macromolecular Materials and Engineering, vol. 289, no. 4, 2004, pp. 315-323.
http://dx.doi.org/10.1002/mame.200300344
---------- VANCOUVER ----------
Dell'Erba, I.E., Fasce, D.P., Williams, R.J.J., Erra-Balsells, R., Fukuyama, Y., Nonami, H. Epoxy networks modified by a new class of oligomeric silsesquioxanes bearing multiple intramolecular rings formed through Si-O-C bonds. Macromol. Mater. Eng. 2004;289(4):315-323.
http://dx.doi.org/10.1002/mame.200300344