Effect of colloidal silver and gold nanoparticles on the thermal behavior of poly(t-butyl acrylate) composites
authors Fateixa, S; Daniel-da-Silva, AL; Jordao, N; Barros-Timmons, A; Trindade, T
nationality International
journal COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
author keywords Colloidal gold; Colloidal silver; Nanocomposites; Poly(t-butyl acrylate); Thermal analysis
keywords GLASS-TRANSITION; POLYMER NANOCOMPOSITES; ENCAPSULATION; MINIEMULSION; FABRICATION; COPOLYMERS; FILMS
abstract Although many polymer nanocomposites have been described, the impact of colloidal nanoparticles (NPs) used as fillers on the thermal behavior of the matrix has been described only in a few cases. Here we apply thermal methods to inquire the effect of organically capped Ag and Au particles on poly(tert-butyl acrylate) (PtBA) based composites. The nanocomposites have been prepared by ex situ and in situ methods; in the former method the metal NPs were isolated from the respective colloids and then blended into cast films obtained from tetrahydrofuran solutions of the polymer; while in the latter the in situ polymerization of tert-butyl acrylate using miniemulsions was carried out in the presence of homogeneously dispersed colloidal NPs. The nanocomposite materials were then characterized by differential scanning calorimetry (DSC) to assess the effect of colloidal metal NPs on the glass transition temperature of the polymer (T-g) namely by considering their chemical nature, average particle size, and metal load. Although similar effects have been observed when Au or Ag NPs were employed as nanofillers, it was also found that the T-g depends on the NPs morphological characteristics and on the preparative method employed to obtain the nanocomposite. This research also highlights the relevance of the surface chemistry of colloidal nanofillers on the thermal behavior of the respective composites. (C) 2013 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0927-7757
year published 2013
volume 436
beginning page 231
ending page 236
digital object identifier (doi) 10.1016/j.colsurfa.2013.06.009
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000326416900030
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journal impact factor 2.829
5 year journal impact factor 2.852
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