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New Improved Thermosets Obtained From Diglycidylether of Bisphenol A and a Multiarm Star Copolymer Based on Hyperbranched Poly(glycidol) Core and Poly(methyl methacrylate) Arms

Authors

  • Mireia Morell,

    1. Department of Analytical and Organic Chemistry, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007, Tarragona, Spain
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  • Xavier Ramis,

    1. Thermodynamics Laboratory, ETSEIB Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028, Barcelona, Spain
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  • Francesc Ferrando,

    1. Department of Mechanical Engineering, Universitat Rovira i Virgili, C/Països Catalans, 26, 43007, Tarragona, Spain
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  • Àngels Serra

    Corresponding author
    1. Department of Analytical and Organic Chemistry, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007, Tarragona, Spain
    • Department of Analytical and Organic Chemistry, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007, Tarragona, Spain.
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Abstract

A well-defined multiarm star copolymer, hyperbranched poly(glycidol)-b-poly(methyl methacrylate) (PGOH-b-PMMA), is used as a modifier in the curing of diglycidylether of bisphenol A (DGEBA) using 1-methyl imidazole (1MI) as anionic initiator. The effect of the polymer topology on the curing and gelation processes is studied. The addition of the PGOH-b-PMMA to the resin leaves the complex viscosity unaltered. The addition of the modifier decreases the shrinkage after gelation compared to that measured in the curing of the neat resin. By DMTA a single relaxation process in the pure DGEBA and modified thermoset is found. The addition of the star-like modifier led to an improvement on the mechanical characteristics such as the impact strength and microhardness in comparison to the neat material.

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