Characterization and biodegradation behavior of bio-based poly(lactic acid) and soy protein blends for sustainable horticultural applications

dc.contributor.author Yang, Shengzhe
dc.contributor.author Madbouly, Samy
dc.contributor.author Schrader, James
dc.contributor.author Srinivasan, Gowrishankar
dc.contributor.author Grewell, David
dc.contributor.author Grewell, David
dc.contributor.author McCabe, Kenneth
dc.contributor.author Kessler, Michael
dc.contributor.author Graves, William
dc.contributor.department Materials Science and Engineering
dc.contributor.department Horticulture
dc.contributor.department Agricultural and Biosystems Engineering
dc.contributor.department Center for Industrial Research and Service (CIRAS)
dc.date 2018-02-19T06:56:02.000
dc.date.accessioned 2020-06-29T22:43:04Z
dc.date.available 2020-06-29T22:43:04Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2015
dc.date.issued 2015-01-01
dc.description.abstract <p>Adipic anhydride-plasticized soy protein (SP.A) was blended with poly(lactic acid) (PLA) at two concentrations (50/50 and 33/67) and was evaluated for use as a sustainable replacement for petroleum plastic in horticulture crop containers. Following the discovery that SP.A/PLA blends provide additional functions above that of petroleum plastic for this application, the present study evaluates the biodegradation behavior of these materials in soil and describes the substantial improvements in sustainability that result from the additional functions (intrinsic fertilizer and root improvement of plants) and the end-of-life option of biodegradation. After being buried in soil for designated time intervals, the residual degraded samples were analyzed to determine morphological and thermal properties at sequential stages of biodegradation. Samples were characterized by scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The results indicated that there was a compatible system between SP.A and PLA in the melt. Incorporation of SP.A accelerated the biodegradation rate of this binary blend significantly compared with pure PLA. Prior to the degradation process, both the glass transition temperatures and melting temperatures of the blends containing SP.A decreased as the concentration of the soy protein increased. With increasing degradation time of the blended samples in soil, the glass transition temperatures increased in the early stages of biodegradation then decreased, a trend associated with the decrease in the molecular weight of the blends as a result of biodegradation. In addition, the thermal stability of blends increased gradually with increasing degradation time, suggesting faster biodegradation loss of the soy component of the SP.A/PLA blends. These results support the use of soy-based polymer blends for horticulture crop containers and provide data for evaluating their use as sustainable materials for other potential applications.</p>
dc.description.comments <p>This is a manuscript of an article published as Yang, Shengzhe, Samy A. Madbouly, James A. Schrader, Gowrishankar Srinivasan, David Grewell, Kenneth G. McCabe, Michael R. Kessler, and William R. Graves. "Characterization and biodegradation behavior of bio-based poly (lactic acid) and soy protein blends for sustainable horticultural applications." Green Chemistry 17, no. 1 (2015): 380-393. DOI: <a href="http://dx.doi.org/10.1021/ic101356n" target="_blank">10.1039/C4GC01482K</a>. Posted with permission. </p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/840/
dc.identifier.articleid 2121
dc.identifier.contextkey 11310161
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/840
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1647
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/840/2015_Grewell_ProcessingCharacterization.pdf|||Sat Jan 15 02:11:14 UTC 2022
dc.source.uri 10.1039/C4GC01482K
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Polymer and Organic Materials
dc.subject.disciplines Sustainability
dc.title Characterization and biodegradation behavior of bio-based poly(lactic acid) and soy protein blends for sustainable horticultural applications
dc.type article
dc.type.genre article
dspace.entity.type Publication
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