High molecular weight thermoplastic polyether ester elastomer by reactive extrusion |
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Authors: | Sunghwan Cho Yunjoo Jang Dongmin Kim Taeyoung Lee Dongho Lee Youngkwan Lee |
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Affiliation: | 1. Advanced Polymeric Materials R&D Center, Samyang Corporation, 63‐2 Hwaam, Yuseong, Daejeon 305‐717, Korea;2. Department of Chemical Engineering, Sungkyunkwan University, Suwon, Kyunggi 440‐746, Korea;3. Department of Materials Science and Engineering, Hong Ik University, Yeongi, Chungnam 339‐701, Korea;4. R&D Support/Technology Center, Korea Delphi Automotive Systems Corporation., 580‐1 Buk‐ri, Nongong‐eup, Dalseong‐gun, Daegu 711‐712, Korea;5. Department of Polymer Science, Kyungpook National University, Daegu 702‐701, Korea |
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Abstract: | A reactive branched thermoplastic polyether‐ester elastomer (TPEE) precursor was synthesized by the esterification reaction of dimethyl terephthalate (DMT) with poly(tetramethylene etherglycol) (PTMEG), 1,4‐butadiene, and glycerol as a soft segment, hard segment, and a branching agent, respectively. The high molecular weight TPEE was further synthesized with the prepared branched TPEE precursor, poly(butylene terephthalate) (PBT) and modified methylene diisocyanate (m‐MDI, 0.5–2.0 wt%) by the reactive extrusion method. Their chemical structures were determined by Fourier Transform Infra Red (FTIR) and Proton‐Nuclear Magnetic Resonance (1H NMR). Thermal characteristics and rheological properties of TPEE were measured by Differential Scanning Calorimetry (DSC) and rheometer as a function of m‐MDI content. The intrinsic viscosity (IV) and melt index ratio (MIR) of TPEE increased as the content of m‐MDI increased up to 1.5 wt% and remained constant thereafter. The variation of the MIR was consistent with that of the IV. The storage modulus and viscosity did not vary with the measurement time up to 1.0 wt% of m‐MDI at the first extrusion, which indicates that the m‐MDI reacted fully. However, the viscosity and storage modulus increased with increasing measurement time at m‐MDI contents over 1.5 wt%. POLYM. ENG. SCI., 2009. © 2009 Societyof Plastics Engineers |
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