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New anhydride/epoxy thermosets based on diglycidyl ether of bisphenol A and 10-undecenoyl modified poly(ethyleneimine) with improved impact resistance
Affiliation:1. Department of Analytical and Organic Chemistry, Universitat Rovira i Virgili, C/ Marcel·lí Domingo s/n, 43007 Tarragona, Spain;2. Centre Tecnològic de la Química de Catalunya, CTQC, C/ Marcel·lí Domingo s/n, 43007 Tarragona, Spain;3. Department of Mechanical Engineering, Universitat Rovira i Virgili, C/ Països Catalans, 26, 43007 Tarragona, Spain;4. Thermodynamics Laboratory, ETSEIB Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028 Barcelona, Spain;1. Department of Physics, Sri Ramakrishna Mission Vidyalaya college of Arts and Science, Coimbatore 641020, Tamil Nadu, India;2. Research & Development Centre, Bharathiar University, Coimbatore 641046, Tamil Nadu, India;3. Department of Physics, Dr. Mahalingam College of Engineering and Technology, Pollachi 642003, Tamil Nadu, India;4. Department of Physics, Adhiyamaan College of Engineering, Hosur 635109, Tamil Nadu, India;1. Departamento de Física, Universidade Federal da Paraíba, Caixa Postal 5008, 58059-900 João Pessoa, PB, Brazil;2. Instituto Federal da Bahia – Campus Vitoria da Conquista, Avenida Amazonas 3150, 45030-220 Vitória da Conquista, BA, Brazil;1. Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria, Private Bag X680, Pretoria, South Africa;2. Department of Electrical Engineering, Tshwane University of Technology, Pretoria, Private Bag X680, Pretoria, South Africa;3. Center for Energy and Electrical Power, Tshwane University of Technology, Pretoria, Private Bag X680, Pretoria, South Africa;4. Department of Metallurgical and Materials Engineering, University of Nigeria, Nsukka, Private Bag 0004, Nsukka Enugu State, Nigeria;5. Africa Centre of Excellence on Sustainable Power and Energy Development, University of Nigeria, Nsukka, Private Bag 0004, Nsukka Enugu State, Nigeria
Abstract:New dendritic modifiers have been synthesized by amidation of hyperbranched poly(ethylenimine) (PEIs) with 10-undecenoic acid to obtain hyperbranched polymers (HBPs) with different degree of modification. These HBPs have been used as toughness modifiers in a proportion of 10 and 20% in reference to the epoxy resin in diglycidyl ether of bisphenol A (DGEBA)/methyltetrahydrophthalic anhydride (MTHPA) formulations. The curing process has been studied by dynamic scanning calorimetry and by rheometry, which allow the kinetic constants and the gel and vitrification times to be evaluated. The materials obtained have been thermally characterized and their mechanical properties have been evaluated. An increase in impact resistance has been achieved and the Tg of all thermosets prepared was higher than 100 °C in spite of the flexible structure of the PEI modifiers.
Keywords:Thermosetting resins  Hyperbranched  Toughness  Anhydride  Rheology
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