Sequential graft-interpenetrating polymer networks based on polyurethane and acrylic/ester copolymers

• Published in: Express polymer letters Vol. 10; no. 3; pp. 204 - 215
• Main Authors: Ballestero, R., Sundaram, B. M., Tippur, H. V., Auad, M. L.
• Format: Journal Article
• Language: English
• Published: Budapest Budapest University of Technology and Economics, Faculty of Mechanical Engineering, Department of Polymer Engineering 01.03.2016; Budapest University of Technology
• Subjects: Acrylic resins; Addition polymerization; Bisphenol A; Copolymers; Crosslinking; Elastomers; Fourier transforms; fracture; Fracture toughness; Free radical polymerization; Free radicals; Graft copolymers; highly transparency; Interpenetrating networks; Interpenetrating polymer netwo; Mechanical properties; Molecular weight; Morphology; Networks; Phase separation; Polymer blends; Polymer synthesis, molecular e; Polymerization; Polymers; Polyurethane resins; Thermomechanical properties; United States > US
• ISSN: 1788-618X; 1788-618X
• DOI: 10.3144/expresspolymlett.2016.19

Highly transparent and tough graft-interpenetrating polymer networks (graft-IPNs) were synthesized using an elastomeric polyurethane phase (PU) and a highly stiff acrylate-base copolymer phase. The grafting points between the two networks were generated with the purpose of minimizing the phase separation process of the polymeric systems. In order to generate the grafting between the networks, an acrylic resin capable of undergoing both free radical and poly-addition polymerization was employed. The thermo-mechanical properties, fracture toughness properties as well as network and surface phase morphology of the graft-IPNs synthesized were evaluated in this work. Data obtained suggested that the minimization of the phase separation was achieved by the generation of crosslinking points between both networks. High transparency was obtained in all samples as an indication of the high level of interpenetration achieved. The relative high values obtained for the fracture toughness tests suggest that generating chemical crosslinks between networks is a good approach for increasing the fracture toughness of polymeric materials.