Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification
The crystallization of highly purified natural rubber (NR) was investigated by polarized light microscopy. NR was deproteinized with proteolytic enzyme in the presence of surfactant and further purified by acetone-extraction followed by transesterification to remove all mixed and linked fatty acids...
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th-mahidol.214302018-07-24T10:45:07Z Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification Seiichi Kawahara Keiko Takano Jintana Yunyongwattanakorn Yoshinobu Isono Masamichi Hikosaka Jitladda T. Sakdapipanich Yasuyuki Tanaka Nagaoka University of Technology Mahidol University Hiroshima University Materials Science The crystallization of highly purified natural rubber (NR) was investigated by polarized light microscopy. NR was deproteinized with proteolytic enzyme in the presence of surfactant and further purified by acetone-extraction followed by transesterification to remove all mixed and linked fatty acids present in NR. The rubber was fractionated and characterized by size exclusion chromatography,1H and13CNMR spectroscopy. Fractionated rubbers were crystallized at 252-258 K, in which spherulite was observed. The estimated nucleation and growth rates depended on supercooling. Surface free energies were determined for highly purified NR. Nucleating effect of fatty acids on the crystallization was proved by change in the surface free energy after removing and/or adding fatty acids. 2018-07-24T03:45:07Z 2018-07-24T03:45:07Z 2004-07-12 Article Polymer Journal. Vol.36, No.5 (2004), 361-367 10.1295/polymj.36.361 00323896 2-s2.0-3042598270 https://repository.li.mahidol.ac.th/handle/123456789/21430 Mahidol University SCOPUS https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=3042598270&origin=inward |
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Materials Science Seiichi Kawahara Keiko Takano Jintana Yunyongwattanakorn Yoshinobu Isono Masamichi Hikosaka Jitladda T. Sakdapipanich Yasuyuki Tanaka Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification |
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The crystallization of highly purified natural rubber (NR) was investigated by polarized light microscopy. NR was deproteinized with proteolytic enzyme in the presence of surfactant and further purified by acetone-extraction followed by transesterification to remove all mixed and linked fatty acids present in NR. The rubber was fractionated and characterized by size exclusion chromatography,1H and13CNMR spectroscopy. Fractionated rubbers were crystallized at 252-258 K, in which spherulite was observed. The estimated nucleation and growth rates depended on supercooling. Surface free energies were determined for highly purified NR. Nucleating effect of fatty acids on the crystallization was proved by change in the surface free energy after removing and/or adding fatty acids. |
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Nagaoka University of Technology |
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Nagaoka University of Technology Seiichi Kawahara Keiko Takano Jintana Yunyongwattanakorn Yoshinobu Isono Masamichi Hikosaka Jitladda T. Sakdapipanich Yasuyuki Tanaka |
format |
Article |
author |
Seiichi Kawahara Keiko Takano Jintana Yunyongwattanakorn Yoshinobu Isono Masamichi Hikosaka Jitladda T. Sakdapipanich Yasuyuki Tanaka |
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Seiichi Kawahara |
title |
Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification |
title_short |
Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification |
title_full |
Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification |
title_fullStr |
Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification |
title_full_unstemmed |
Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification |
title_sort |
crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification |
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2018 |
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https://repository.li.mahidol.ac.th/handle/123456789/21430 |
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1763498085927878656 |