Synthesis and properties of thermoplastic propyl-etherified amylose

Amylose was etherified with 1-bromopropane in DMSO. The degree of substitution (DS) was varied by altering the feed ratio of 1-bromopropane. The structures of the products were characterized by IR and 1 H-NMR spectroscopy. When the molar feed ratio of 1-bromopropane to hydroxyl groups of amylose was...

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Bibliographic Details
Published in:European polymer journal 2002-07, Vol.38 (7), p.1365-1369
Main Authors: Teramoto, Naozumi, Motoyama, Toyoki, Yosomiya, Ryutoku, Shibata, Mitsuhiro
Format: Article
Language:English
Subjects:
1-Bromopropane
Amylose
Applied sciences
Etherification
Exact sciences and technology
Melt processability
Modified starch
Natural polymers
Physicochemistry of polymers
Propyl-etherified amylose
Starch and polysaccharides
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Summary:Amylose was etherified with 1-bromopropane in DMSO. The degree of substitution (DS) was varied by altering the feed ratio of 1-bromopropane. The structures of the products were characterized by IR and 1 H-NMR spectroscopy. When the molar feed ratio of 1-bromopropane to hydroxyl groups of amylose was beyond 7.5, the hydroxyl groups were completely substituted with propyl ether groups. The etherified amylose with DS 1.9 showed a glass transition temperature ( T g), and that with DS 2.3 or 3.0 showed both T g and melting temperature ( T m) (DS 3.0 means complete substitution). The etherification imparted melt processability and solubility in nonpolar organic solvent to amylose.
ISSN:0014-3057
1873-1945
DOI:10.1016/S0014-3057(01)00306-8