High transition temperature shape memory polymers (SMPs) by telechelic oligomer approach |
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| Affiliation: | 1. Polymers and Special Chemicals Group, Vikram Sarabhai Space Centre, Thriruvananthapuram 695 022, India;2. Department of Chemistry, Indian Institute of Space Science and Technology, Thriruvananthapuram 695 547, Kerala, India;1. Chemical Engineering Department, Faculty of Chemistry, University of Barcelona, C/Martí i Franquès 1, 08028 Barcelona, Spain;2. Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, 16502 Prague 6-Suchdol, Czech Republic;1. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, People''s Republic of China;2. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, People''s Republic of China;1. Department of Mechanical Engineering, Universitat Rovira i Virgili, Av. Països Catalans, 26, 43007 Tarragona, Spain;2. Department of Chemical, Materials and Production Engineering, University of Naples “Federico II”, Piazzale Tecchio, 80, 80125 Napoli, Italy;3. Institute for Polymers, Composites and Biomaterials, National Council of Research of Italy, Via Campi Flegrei, 34, 80078 Pozzuoli, NA, Italy;4. Thermodynamics Laboratory ETSEIB, Universitat Politècnica de Catalunya, Av. Diagonal, 647, 08028 Barcelona, Spain;1. School of Chemical and Environment Engineering, North University of China, Taiyuan 030051, People’s Republic of China;2. School of Science, North University of China, Taiyuan 030051, People’s Republic of China;1. Science and Technology on Advanced Composites in Special Environments Laboratory, Harbin Institute of Technology, Harbin, 150080, China;2. Department of Mechanical Engineering, University of Colorado Denver, Denver, CO, 80217, United States;3. Faculty of Engineering and Environment, University of Northumbria, Newcastle upon Tyne, NE1 8ST, UK |
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| Abstract: | This work describes the synthesis and comparative shape memory properties of cross-linked networks derived from epoxy and cyanate ester monomers containing polyether oligomers as reactive shape memory segments. The hydroxy telechelic oligomers viz. polyethyleneglycol (PEG), polypropyleneglycol (PPG), and polytetramethyleneglycol (PTG) are reacted with epoxy–cyanate ester matrix resulting in shape memory polymers with high transition temperatures. The soft oligomer segments act as flexible linker unit which interconnect oxazolidone, isocyanurate and triazine ring structures in the cross-linked polymer. The resultant cyclomatrix SMPs exhibit high transition temperatures 132, 178 and 161 °C respectively for PEG, PPG and PTG integrated SMPs. The Eg/Er ratios are increased in the order PEG < PTG < PPG. The PTG and PPG based SMPs show shape retention of 99% and shape recovery of >98% with recovery time <100 s. All the SMPs display good thermal stabilities (both inert and oxidative) above 275 °C. |
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| Keywords: | Shape memory polymer Epoxy resin Cyanate ester Hydroxy telechelic oligomer Thermal stability |
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