Dynamic Viscoelasticity of Ionomers Based on Ethylene-co-Methacrylic Acid Copolymer in the Melt State.
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- ZENG Xiangsheng
- Department of Polymer Science and Engineering, Kyoto Institute of Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo–ku, Kyoto 606–8501, Japan
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- TAKAHASHI Masaoki
- Department of Polymer Science and Engineering, Kyoto Institute of Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo–ku, Kyoto 606–8501, Japan
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- YAMANE Hideki
- Department of Polymer Science and Engineering, Kyoto Institute of Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo–ku, Kyoto 606–8501, Japan
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- TAKIGAWA Toshikazu
- Department of Material Chemistry, Kyoto University, Kyoto 606–8501, Japan
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- MASUDA Toshiro
- Department of Material Chemistry, Kyoto University, Kyoto 606–8501, Japan
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Abstract
Dynamic viscoelasticity of ethylene-co-methacrylic acid copolymer (EMAA) and its ionomers (EMAA-Zn and EMAA-Na) has been measured in the melt state. The time-temperature superposition principle is applicable to data of angular frequency dependences of storage modulus (G') and loss modulus (G") for EMAA very well from 140°C to 200°C. On the other hand, data for ionomers give two separated master curves with different temperature dependences of shift factor, one from the data obtained in the range of 140°C-170°C and the other in the range of 180°C-200°C. Even at 200°C, the moduli G' and G" are still much higher than those of EMAA. These results indicate that a structure change in EMAA ionomers occurs between 170°C and 180°C. The free volume fraction (fr) and the thermal expansion coefficient (αf) in the range of 180°C-200°C are larger than those in the range of 140°C-170°C for EMAA ionomers. This implies that in higher temperature range, some hydrocarbon chains depart from cross-links of ion aggregates and move much more freely.
Journal
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- Nihon Reoroji Gakkaishi
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Nihon Reoroji Gakkaishi 27 (1), 53-57, 1999
The Society of Rheology, Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001205093811968
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- NII Article ID
- 10002771845
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- NII Book ID
- AN00198812
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- COI
- 1:CAS:528:DyaK1MXjtlygu78%3D
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- ISSN
- 21864586
- 03871533
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- NDL BIB ID
- 4681084
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed