Authors Morell, M. ; Erber, M. ; Ramis, X. ; Ferrando, F. ; Voit, B. ; Serra, A.
Title New epoxy thermosets modified with hyperbranched pol(ester-amide) of different molecular weight
Date 29.06.2010
Number 22803
Abstract The influence of hydroxy-functionalized hyperbranched poly(ester-amide) (HBP) of different molecular weight on the curing process of diglycidylether of bisphenol A (DGEBA) was studied using methyltetrahydrophthalic anhydride (MTHPA) as curing agent. By Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared Spectroscopy (FTIR) the curing reaction was monitored and the covalent incorporation of the modifier in the matrix was proved. By thermomechanical analysis (TMA) the reduction of the contraction after gelation on changing the HBP proportion was observed. The incorporation of HBP increased the glass transition temperature (Tg) and reduced the overall shrinkage. The modified materials showed a higher thermal degradability than neat DGEBA thermosets allowing reworkability. Thermal expansion coefficient, Young’s modulus, impact strength and microhardness were improved. The water uptake behavior was also evaluated.
Publisher European Polymer Journal
Citation European Polymer Journal 46 (2010) 1498-1509
Tags epoxy resin hyperbranched polymers toughness increase shrinkage diglycidyl ether bisphenol-a cationic copolymerization ytterbium triflate polymers resins dgeba composites shrinkage improvement

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