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Decomposition characteristics of biodegradable plastics made from sago starch‐extraction residue
Author(s) -
Igura Masato,
Okazaki Masanori,
Ohmi Masaharu
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.32236
Subject(s) - starch , inceptisol , nuclear chemistry , thermal decomposition , chemistry , residue (chemistry) , plasticizer , triacetin , decomposition , extraction (chemistry) , organic chemistry , materials science , biology , soil water , ecology
Biodegradable plastics were synthesized for the effective use of sago starch‐extraction residue, which has been discarded as a waste. Two types of esterified sago starch‐extraction residue, P‐SP and L‐SP, were obtained. It had black color for P‐SP 160 (esterified by palm oil) to light yellow color for L‐SP 80 (esterified by lauric acid) and showed high carbon content, ranging from 399.3 to 537.1 g kg −1 . Biodegradable plastics from the residue, which had high esterification degree showed thermoplasticity and slower decomposition in Andisols in Japan and Inceptisols in Philippines. The esterification degrees of P‐SP 160 and L‐SP were 3.23 and 2.95 to 5.18 mmol g −1 , respectively. In addition, L‐SP 80 exhibited the most appropriate thermal softening behavior by heating. The cumulative decomposition of P‐SP 160 in Andisols and Inceptisols showed 16.7 and 32.8% of total carbon during 31 day of the incubation. On the other hand, the decomposition rates of L‐SP 80 in Andisols and Inceptisols were less than 10% of total carbon during 31 day of the incubation. The addition of triacetin as plasticizer to P‐SP 160 and L‐SP 80 remarkably influenced the decomposition rate of both molded P‐SP 160 and L‐SP 80 . © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011