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Biodegradable Blends from Corn Gluten Meal and Poly(butylene adipate-co-terephthalate) (PBAT): Studies on the Influence of Plasticization and Destructurization on Rheology, Tensile Properties and Interfacial Interactions

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Abstract

Melt extrusion was used to obtain thermoplastic corn gluten meal (tCGM) blends from plasticized corn gluten meal (pCGM) and poly(butylene adipate-co-terephthalate) (PBAT). Dynamic rheological tests, morphology and spectroscopy were employed to understand the effect of the plasticization and destructurization of corn gluten meal (CGM) on tCGM blends. Rheological data showed a plateau in the low frequencies for tCGM blends demonstrating network formation which responds elastically over long timescales. Also, complex viscosity data showed the existing of shear thinning for PBAT and PBAT–CGM blend. Furthermore, rheology and morphology showed the synergistic influence of plasticization and destructuralization of CGM on the phase structure development of the blends. In addition, it was found for unmodified CGM–PBAT blend there was significant frequency dependence for G′ indicating it just acted as filler for PBAT matrix. FTIR studies showed that the urea has helped in unfolding the corn protein and facilitated hydrogen bonding interactions with PBAT. Tensile properties showed an improvement in tCGM blends when compared unmodified CGM blend. Tensile strength of tCGM blends was almost same as that of the neat PBAT matrix. Percent elongation, a strong reflection of the state of interface in the blends has showed higher values, indicating strong interactions between the PBAT and pCGM in the blend system.

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Acknowledgments

This research is financially supported by the Ontario Ministry of Agriculture and Food and the Ministry of Rural Affairs (OMAF-MRA)/University of Guelph—Bioeconomy for Industrial Uses Research Program; OMAF-MRA New Directions and Alternative Renewable Fuels ‘Plus’ Research Program and Ontario research fund, research excellence, round-4 (ORF RE04) from Ontario ministry of economic development and innovation (MEDI).

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Authors and Affiliations

  1. Department of Plant Agriculture, Bioproducts Discovery and Development Centre (BDDC), Crop Science Building, University of Guelph, Guelph, ON, N1G 2W1, Canada

    Murali M. Reddy, Manjusri Misra & Amar K. Mohanty

  2. School of Engineering, Thornbrough Building, University of Guelph, Guelph, ON, N1G 2W1, Canada

    Manjusri Misra & Amar K. Mohanty

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  1. Murali M. Reddy
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  2. Manjusri Misra
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  3. Amar K. Mohanty
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Correspondence to Manjusri Misra or Amar K. Mohanty.

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Reddy, M.M., Misra, M. & Mohanty, A.K. Biodegradable Blends from Corn Gluten Meal and Poly(butylene adipate-co-terephthalate) (PBAT): Studies on the Influence of Plasticization and Destructurization on Rheology, Tensile Properties and Interfacial Interactions. J Polym Environ 22, 167–175 (2014). https://doi.org/10.1007/s10924-014-0640-4

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