Poly(styrene‐butadiene‐methylmethacrylate) (SBM) and poly(methylmethacrylate‐butyle‐acrylate‐methylmethacrylate) (MAM) triblock copolymers have been dissolved in liquid DGEBA epoxy resin which is subsequently polymerized by meta‐xylene diamine (MXDA) or Jeffamine EDR‐148. A chemorheology study of these formulations by plate‐plate rheology and by thermal analysis has allowed to conclude that the addition of these copolymer blocks improve the reactive rotational moulding processability without affecting the processing time. Indeed, it prevents the pooling of the formulation at the bottom of the mould and a too rapid build up of resin viscosity of these thermosetting systems. The morphology of the cured blends examined by scanning electron microscopy (SEM) shows an increase of fracture surface area and thereby a potential increase of the toughness with the modification of epoxy system. Dynamic mechanical spectroscopy (DMA) and opalescence of final material show that the block PMMA, initially miscible, is likely to induce phase separation from the epoxy‐amine matrix. Thereby, the poor compatibilisation between the toughener and the matrix has a detrimental effect on the tensile mechanical properties. The compatibilisation has to be increased to improve in synergy the processability and the final properties of these block copolymer modified formulations. First attempts could be by adapting the length and ratio of each block.
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4 May 2011
THE 14TH INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2011
27–29 April 2011
Belfast, (United Kingdom)
Research Article|
May 04 2011
Block Copolymer Modified Epoxy Amine System for Reactive Rotational Molding: Structures, Properties and Processability
Eva Lecocq;
Eva Lecocq
aLaboratoire de Synthèse et de Transformation des Polymères, CEA Le Ripault, BP 16, 37260 Monts, France
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Fabien Nony;
Fabien Nony
aLaboratoire de Synthèse et de Transformation des Polymères, CEA Le Ripault, BP 16, 37260 Monts, France
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Abbas Tcharkhtchi;
Abbas Tcharkhtchi
bLaboratoire d’Ingénierie des Matériaux‐UMR 8006, ENSAM, 151 boulevard de l’Hôpital, 75013 Paris, France
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Jean‐François Gérard
Jean‐François Gérard
cLaboratoire des Matériaux Macromoléculaires‐CNRS UMR 5627, INSA de Lyon, 20 avenue A. Einstein, 69621 Villeurbanne Cedex, France
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AIP Conf. Proc. 1353, 767–772 (2011)
Citation
Eva Lecocq, Fabien Nony, Abbas Tcharkhtchi, Jean‐François Gérard; Block Copolymer Modified Epoxy Amine System for Reactive Rotational Molding: Structures, Properties and Processability. AIP Conf. Proc. 4 May 2011; 1353 (1): 767–772. https://doi.org/10.1063/1.3589608
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