Characterization of the ion-paired polyurethane copolymers |
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Authors: | Yong-Chan Chung Duy Khiem Nguyen Byoung Chul Chun |
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Institution: | 3. Department of Chemistry, The University of Suwon, Hwasung, 445-743, Korea 1. Department of Polymer Engineering, The University of Suwon, Hwasung, 445-743, Korea 2. School of Nano Engineering, Center for Nano Manufacturing, Institute of Basic Science, Inje University, Gimhae, 621-749, Korea
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Abstract: | The polyurethane (PU) copolymer was grafted with either 3-dimethylaminopropanol as a basic pendant group or 4-hydroxylphenylacetic acid as an acidic pendant group. The two types of PU were mixed in solution to form ion-pairing between acidic and basic pendant groups. The structural change after grafting and ion-pairing was followed by acid-base titration, infrared spectra, differential scanning calorimetry, and absolute viscosity. The tensile stress can be raised as much as 70 % by the control of the ion-pairing ratio of acidic and basic PUs. Shape recovery was over 80 % and reproducible for four test cycles. The minor control of tensile properties of PU was possible through the ion-pairing method. |
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