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Title: Depolymerization and ionic conductivity of enzymatically deproteinized natural rubber having epoxy group
Authors: Warunee Klinklai
Seiichi Kawahara
Tomonobu Mizumo
Masahiro Yoshizawa
Jitladda Tangpakdee Sakdapipanich
Yoshinobu Isono
Hiroyuki Ohno
Nagaoka University of Technology
Tokyo University of Agriculture and Technology
Mahidol University
Keywords: Chemistry;Materials Science;Physics and Astronomy
Issue Date: 1-Aug-2003
Citation: European Polymer Journal. Vol.39, No.8 (2003), 1707-1712
Abstract: Preparation of liquid epoxidized natural rubber (ENR) was made by oxidative depolymerization of ENR in latex stage without loss of epoxy group. Epoxidation of fresh natural rubber latex, which was purified by deproteinization with proteolytic enzyme and surfactant, was carried out with freshly prepared peracetic acid. The glass transition temperature (Tg) and gel content of the rubbers increased after the epoxidation, both of which were dependent upon an amount of peracetic acid. The gel content was significantly reduced by oxidative depolymerization of the rubber with (NH4)2S2O8in the presence of propanal. The resulting liquid epoxidized rubber (Mn≈ 104) was found to have well-defined terminal groups, i.e. aldehyde groups and α-β unsaturated carbonyl groups. The novel rubber was applied to transport Li+as an ionic conducting medium, that is, solid polymer electrolyte. © 2003 Elsevier Ltd. All rights reserved.
ISSN: 00143057
Appears in Collections:Scopus 2001-2005

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