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Please use this identifier to cite or link to this item: http://repository.li.mahidol.ac.th/dspace/handle/123456789/21430
Title: Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification
Authors: Seiichi Kawahara
Keiko Takano
Jintana Yunyongwattanakorn
Yoshinobu Isono
Masamichi Hikosaka
Jitladda T. Sakdapipanich
Yasuyuki Tanaka
Nagaoka University of Technology
Mahidol University
Hiroshima University
Keywords: Materials Science
Issue Date: 12-Jul-2004
Citation: Polymer Journal. Vol.36, No.5 (2004), 361-367
Abstract: 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.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=3042598270&origin=inward
http://repository.li.mahidol.ac.th/dspace/handle/123456789/21430
ISSN: 00323896
Appears in Collections:Scopus 2001-2005

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