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Assessing the influence of cotton fibers on the degradation in soil of a thermoplastic starch-based biopolymer
Instituto de Tecnología de Materiales (ITM), Universidad Politécnica de Valencia, Spain.ORCID iD: 0000-0002-0252-337X
KTH Royal Institute of Technology.ORCID iD: 0000-0002-5394-7850
Instituto de Tecnología de Materiales (ITM), Universidad Politécnica de Valencia, Spain.
2010 (English)In: Polymer Composites, ISSN 0272-8397, E-ISSN 1548-0569, Vol. 31, no 12, p. 2102-2111Article in journal (Refereed) Published
Abstract [en]

Biocomposites consisting of cotton fibers and a commercial starch-based thermoplastic were subjected to accelerated soil burial test. Fourier transform infrared (FTIR) spectrometry analysis was carried out to provide chemical-structural information of the polymeric matrix and its reinforced biocomposites. The effects that take place as a consequence of the degradation in soil of both materials were studied by FTIR-ATR, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). When the polymeric matrix and the reinforced biocomposite are submitted to soil burial test, the infrared studies display a decrease in the C=O band associated to the ester group of the synthetic component as a consequence of its degradation. The crystalline index of both materials decreased as a function of the degradation process, where the crystalline structure of the reinforced biocomposite was the most affected. In accordance, the degraded reinforced biocomposite micrographs displayed a more damaged morphology and fracture surface than the degraded polymeric matrix micrographs. On the other hand, the same thermal decomposition regions were assessed for both materials, regardless of the degradation time. Kissinger, Criado, and Coats-Redfern methods were applied to analyze the thermogravimetric results. The kinetic triplet of each thermal decomposition process was determined for monitoring the degradation test. The thermal study confirms that starch was the most biodegradable polymeric matrix component in soil. However, the presence of cotton fiber modified the degradation rate of both matrix components; the degradability in soil of the synthetic component was slightly enhanced, whereas the biodegradation rate of the starch slowed down as a function of the soil exposure time. © 2010 Society of Plastics Engineers.

Place, publisher, year, edition, pages
2010. Vol. 31, no 12, p. 2102-2111
Keywords [en]
Bio-composites, Biocomposite, Biodegradation rate, Coats-Redfern method, Crystalline index, Crystalline structure, Degradability, Degradation process, Degradation rate, Degradation test, Degradation time, Ester groups, Fourier transform infrared spectrometry, Fracture surfaces, FT-IR-ATR, Kissinger, Matrix components, Polymeric matrices, SEM, Soil burial test, Soil exposure, Starch-based, Structural information, Thermal decomposition process, Thermal decompositions, Thermal study, Thermoplastic starch, Biodegradable polymers, Biodegradation, Cotton, Cotton fibers, Crystalline materials, Degradation, Differential scanning calorimetry, Esters, Fourier transforms, Pyrolysis, Reinforced plastics, Scanning electron microscopy, Soils, Starch, Thermogravimetric analysis, Fourier Analysis, Infrared Spectra, Mathematical Analysis, Polymers, Reinforced Plastic, Soil, Thermal Analysis
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:his:diva-15885DOI: 10.1002/pc.21007ISI: 000284722700012Scopus ID: 2-s2.0-78649597757OAI: oai:DiVA.org:his-15885DiVA, id: diva2:1229210
Available from: 2018-06-29 Created: 2018-06-29 Last updated: 2018-08-14Bibliographically approved

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Moriana, RosanaKarlsson, Sigbritt

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