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United States Department of Agriculture

Agricultural Research Service

Title: Polysaccharide Based Plastics: Their Biodegradation in Laboratory Studies

Authors
item Arevalo Nino, Katiushka - UNIV NUEVO LEON
item Imam, Syed
item Gordon, Sherald
item Galan Wong, Luis - UNIV NUEVO LEON

Submitted to: Pacific Basin Society Chemical International Congress Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: June 6, 1997
Publication Date: N/A

Technical Abstract: Extruded blown films were prepared using cornstarch alone (F1) and in combination with chitin and with chitin containing low density polyethylene (LDPE) and poly-[ethylene-co-acrylic acid (EAA)]. Control films containing pure LDPE and EAA were also extruded. These films were incubated with a consortium of highly amylolytic bacteria (LD76) to determine their biodegradability. Biodegradation was assessed by measuring the change in the weight loss, FTIR spectra and physical properties over a 30 day period. While pure starch films lost 21% weight in 30 days, starch films containing LDPE-EAA lost 17.23% and starch-chitin film lost 13.6% weight over the same period. The control LDPE and EAA showed negligible weight loss. The FTIR analysis exhibited the diminished absorbency in bands attributed to C-O and O-H regions of starch and chitin. No spectral changes were observed in control samples. While percent elongation diminished significantly in all three formulations, loss of tensile strength was less dramatic.

Last Modified: 11/27/2014