Physical and Thermal Analysis of the Degradation of Poly(3-Hydroxybutyrate-<Emphasis Type="Italic">co</Emphasis>-4-Hydroxybutyrate) Coated Paper in a Constructed Soil Medium |
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| Authors: | Koffi L Dagnon Christopher Thellen Jo Ann Ratto Nandika A D’Souza |
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| Institution: | (1) Department of Materials Science and Engineering, University of North Texas, P.O. Box 305310, Denton, TX 76203, USA;(2) Present address: Department of Macromolecular Science and Engineering, Case Western Reserve University, 2100 Adelbert Rd, Cleveland, OH 44106, USA;(3) Advanced Materials Engineering Team, U.S. Army Natick Soldier Research, Development and Engineering Center, Natick, MA, USA; |
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| Abstract: | The degradation of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P(3HB-co-4HB)) coated brown Kraft paper and its components in a constructed soil environment was investigated. Soil burial tests were
carried out over 8 weeks. Weight loss measurements, photographic analysis, environmental scanning electron microscopy (ESEM),
dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) were conducted to assess the physical, structural,
mechanical and thermal behavior before and after the soil burial test. Paper showed the highest physical degradation and weight
loss. With respect to the control samples, the stiffness of the partially degraded samples decreased. The overall crystallinity
of the biopolymer and the coated paper was affected significantly by burial. The pure biopolymer’s weight loss was substantially
enhanced when coated on paper. This result reveals a possible increased microbial population in the coated paper relative
to the pure biopolymer. |
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