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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thermal Decomposition of Polymer/Montmorillonite Nanocomposites Synthesized in situ on a Clay Surface

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Author(s):
Fecchio, Bruno D. [1] ; Valandro, Silvano R. [1] ; Neumann, Miguel G. [1] ; Cavalheiro, Carla C. S. [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, CP 780, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 27, n. 2, p. 278+, FEB 2016.
Web of Science Citations: 2
Abstract

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)

FAPESP's process: 09/15998-1 - UV/visible light interactions with polymer-clay composites: photopolymerization and photodegradation
Grantee:Carla Cristina Schmitt Cavalheiro
Support Opportunities: Regular Research Grants
FAPESP's process: 12/19656-0 - Photoinitiation of polymerization and degradation of polymers multicomponent
Grantee:Carla Cristina Schmitt Cavalheiro
Support Opportunities: Regular Research Grants