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New improved thermosets obtained from DGEBA and a hyperbranched poly(ester-amide) |
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| Authors: | Mireia Morell Xavier Ramis Francesc Ferrando Yingfeng Yu Angels Serra |
| Affiliation: | a Department of Analytical and Organic Chemistry, University Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain b Thermodynamics Laboratory, ETSEIB University Politècnica de Catalunya, C/Av. Diagonal 647, 08028 Barcelona, Spain c Department of Mechanical Engineering, University Rovira i Virgili, C/Països Catalans 26, 43007 Tarragona, Spain d The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Department of Macromolecular Science, Fudan University, Shanghai 200433, China |
| Abstract: | The influence on the curing process of a commercial hydroxy-functionalized hyperbranched poly(ester-amide) (HBP) Hybrane® S1200 on diglycidylether of bisphenol A (DGEBA) was studied. By Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared Spectroscopy (FTIR) the curing reaction was studied 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 S1200 proportion was observed. The incorporation of S1200 increased the glass transition temperature (Tg) and reduced the overall shrinkage, specially after gelation. The modified materials were more thermally degradable than neat DGEBA thermosets. Thermal expansion coefficient, Young's modulus, impact strength and microhardness were improved without compromising the thermomechanical characteristics. The water uptake behaviour was also evaluated. |
| Keywords: | Epoxy resin Hyperbranched Crosslinking |
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