| Texto completo | |
| Autor(es): |
Fecchio, Bruno D.
[1]
;
Valandro, Silvano R.
[1]
;
Neumann, Miguel G.
[1]
;
Cavalheiro, Carla C. S.
[1]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Quim Sao Carlos, CP 780, BR-13560970 Sao Carlos, SP - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of the Brazilian Chemical Society; v. 27, n. 2, p. 278+, FEB 2016. |
| Citações Web of Science: | 2 |
| Resumo | |
This paper reports the effect of the SWy-1 montmorillonite content on the kinetic thermal degradation of poly(2-hydroxyethyl methacrylate) (PHEMA)/SWy-1 nanocomposites prepared by in situ photopolymerization, using thermogravimetry analysis (TGA). 2-Hydroxyethyl methacrylate was photopolymerized in the presence of SWy-1 clay mineral using 2-hydroxy-3- (3,4-dimethyl-9-oxo-9H-thioxanthen-2-yloxy)-N,N,N-trimethyl-1-propanium chloride (QTX) and triethanolamine as the photoinitiating system. X-Ray diffraction analysis indicates that the PHEMA/SWy-1 nanocomposites present an intercalated structure. The isoconversional Flynn-Wall-Ozawa method was used to estimate activation energies and pre-exponential factors for the thermal decomposition. All nanocomposites exhibited improvement in their thermal stability, mainly due to the large interaction between the PHEMA intercalated in the SWy-1 structure. The activation energies for PHEMA/SWy-1 nanocomposites increased when increasing the clay content. The SWy-1 clay mineral acts as a better insulator, mass transport barrier and as a "crosslinking agent", increasing the activation energies for the decomposition of the polymer present in the nanocomposites. (AU) | |
| Processo FAPESP: | 09/15998-1 - Interações de luz UV/visível com compósitos de polímero-argila: fotopolimerização e fotodegradação |
| Beneficiário: | Carla Cristina Schmitt Cavalheiro |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 12/19656-0 - Fotoiniciação de polimerização e degradação de polímeros multicomponentes |
| Beneficiário: | Carla Cristina Schmitt Cavalheiro |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |