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

doi:10.1295/polymj.36.361

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
Mahidol University

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

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 and ¹³CNMR 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.

Original language	English
Pages (from-to)	361-367
Number of pages	7
Journal	Polymer Journal
Volume	36
Issue number	5
DOIs	https://doi.org/10.1295/polymj.36.361
Publication status	Published - 2004
Externally published	Yes

Keywords

Crystal Nucleation
Deproteinization
Growth
Natural Rubber
Polarized Light Microscopy
Surface Free Energy
Transesterification

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10.1295/polymj.36.361

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title = "Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification",

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 and 13CNMR 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.",

keywords = "Crystal Nucleation, Deproteinization, Growth, Natural Rubber, Polarized Light Microscopy, Surface Free Energy, Transesterification",

author = "Seiichi Kawahara and Keiko Takano and Jintana Yunyongwattanakorn and Yoshinobu Isono and Masamichi Hikosaka and Sakdapipanich, \{Jitladda T.\} and Yasuyuki Tanaka",

year = "2004",

doi = "10.1295/polymj.36.361",

language = "English",

volume = "36",

pages = "361--367",

journal = "Polymer Journal",

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TY - JOUR

T1 - Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification

AU - Kawahara, Seiichi

AU - Takano, Keiko

AU - Yunyongwattanakorn, Jintana

AU - Isono, Yoshinobu

AU - Hikosaka, Masamichi

AU - Sakdapipanich, Jitladda T.

AU - Tanaka, Yasuyuki

PY - 2004

Y1 - 2004

N2 - 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 and 13CNMR 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.

AB - 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 and 13CNMR 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.

KW - Crystal Nucleation

KW - Deproteinization

KW - Growth

KW - Natural Rubber

KW - Polarized Light Microscopy

KW - Surface Free Energy

KW - Transesterification

UR - https://www.scopus.com/pages/publications/3042598270

U2 - 10.1295/polymj.36.361

DO - 10.1295/polymj.36.361

M3 - Article

AN - SCOPUS:3042598270

SN - 0032-3896

VL - 36

SP - 361

EP - 367

JO - Polymer Journal

JF - Polymer Journal

IS - 5

ER -

Crystal nucleation and growth of natural rubber purified by deproteinization and trans-esterification

Abstract

Keywords

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