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The biodegradation of blends of polycaprolactone and polyethylene exposed to a defined consortium of fungi
Authors:Luanne Tilstra  David Johnsonbaugh
Institution:(1) Polymers Division, National Institute of Standards and Technology, 20899 Gaithersburg, Maryland;(2) Department of Chemistry, Rose-Hulman Institute of Technology, 47803 Terre Haute, Indiana
Abstract:Polycaprolactone, polyethylene, and blends of polycaprolactone and polyethylene—in which the portion of polycaprolactone was 80 and 10%—were exposed for periods of from 1 to 16 weeks to a consortium of five fungi in a nutrient salt medium containing 0.8 mg/ml potato dextrose. After exposure the samples were cleaned, dried, and analyzed for weight loss, changes in their molecular weight distribution as determined by gel permeation chromatography, molecular changes as seen by Fourier transform infrared spectrometry (FT-IR), and changes in tensile strength. Tensile strength of polycaprolactone began to decrease after 1 week of exposure, even though the molecular weight distribution showed no change. FT-IR spectra indicated a loss of amorphous polycaprolactone from the surface of samples.Certain commercial products ae identified in order to specify experimental procedures adequately. In no case does such identification imply endorsement by the National Institute of Standards and Technology or that the material is necessarily the best available for the purpose.
Keywords:Biodegradation  polycaprolactone  fungal consortium  Fourier transform infrared spectrometry (FT-IR)  tensile strength  gel permeation chromatography
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