Synthesis and Characterization of an Epoxy Based Thermoset Containing a Fluorinated Thermoplastic

ELISABETH PENOFF; GUADALUPE PAPAGNI; MARÍA YAÑEZ; PABLO MONTEMARTINI; PATRICIA OYANGUREN

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS

J Wiley and Sons

Lugar: Londres; Año: 2007 vol. 45 p. 2781 - 2792

0887-6266

Abstract A novel fluorinated thermoplastic (FT) was synthesized from diglycidyl ether of bisphenol A (DGEBA) and 3-(trifluoromethyl)aniline. FT was found to be miscible with DGEBA as shown by the existence of a single glass transition temperature (Tg) within the whole composition range. On the basis of several experimental techniques, it was found that etherification reaction takes place between FT and DGEBA upon heating. A DGEBA-aromatic diamine (4,4´-methylenebis(3-chloro 2,6-diethylaniline) formulation was modified with the FT. The influence of FT on the epoxy-amine kinetics was investigated. Both structural parameters, gelation and vitrification, were found to be affected by etherification reaction between epoxy and hydroxyls groups belonging to FT. The presence of ether linkages induced modification of the stoichiometry of the system. In addition, the curing conditions influence on FT migration towards the surface was studied on samples prepared with 20 wt % of modifier. SEM?EDX analysis confirmed that the surface of the modified systems exhibits notable fluorine enrichment within the uppermost 200 Em.Em.