Dynamic mechanical properties of polystyrene ionomers containing both carboxylate and sulfonate anionic groups |
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| Authors: | Ju‐Myung Song Kwang‐Hwan Ko Joon‐Seop Kim Kwanwoo Shin |
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| Institution: | 1. Radiation Research Division for Industry and Environment, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup‐Si, Jeollabuk‐Do 580‐185, South Korea;2. Department of Polymer Science and Engineering, BK21 Education Center of Mould Technology for Advanced Materials and Parts, Chosun University, Gwangju 501‐759, South Korea;3. Department of Chemistry, Interdisciplinary Program of Integrated Biotechnology, Sogang University, Seoul 121‐742, South Korea |
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| Abstract: | Polystyrene‐based ionomers possessing sodium methacrylate (MA) and sodium styrenesulfonate (SS) units in each polymer chain poly(styrene‐co‐methacrylate‐co‐styrenesulfonate) (PSMA‐SS)] were synthesized. The dynamic mechanical properties of PSMA‐SS ionomers were studied and compared with those of styrene ionomers containing only MA (PSMA ionomer) or SS (PSS ionomer) units. It was observed that the ionic moduli of PSMA‐SS ionomers depended directly on the total ion content and that the ionic modulus was highest for the PSMA ionomer and lowest for the PSMA‐SS ionomer. The matrix Tgs of the three ionomer systems were found to be similar to each other; the cluster Tg of PSMA‐SS ionomer was higher than that of PSS ionomer at low SS contents but became closer to each other at high SS contents. In addition, the small‐angle X‐ray scattering study revealed that the multiplet size might be in the following order: PSMA‐SS > PSS > PSMA. This implied that at the same ion content, the fractions of cluster regions were smallest for PSMA‐SS ionomer in comparison with those of PSS or PSMA ionomers. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012 |
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| Keywords: | glass transition ionomers mechanical properties |
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