Characterization using X-ray diffraction and study of the crystallinity of the thermoplastic starch/poly(butylene adipate-co-terephthalate) blends irradiated by gamma rays / Caracterização por DRX e estudo de cristalinidade de blendas de amido termoplástico/poli (butileno adipato-co-tereftalato) irradiadas por raios gama

Dione Pereira de Castro, Rafael Henrique Lazzari Garcia, Leonardo Gondim de Andrade e Silva

Abstract


The aim of this study was to analyze the changes in the structure and crystallinity of non-irradiated and irradiated thermoplastic starch blends (TPS)/poly (butylene adipate-co-terephthalate) - PBAT and also to evaluate the behavior of castor oil replacing glycerol. In this work, the characterization was performed by using X-ray diffraction (XRD), in which the crystallinity index (IC) of non-irradiated and irradiated blends of TPS/PBAT was calculated, through the software Bruker DIFFRAC.EVA® v4.22. For the plastification of the TPS, glycerol, castor oil and TWEEN® 80 were used to verify their compatibility and establish a comparison among the blends. The samples were prepared by extrusion and irradiated at 25 kGy with gamma rays with a 60Co source. However, the crystallinity indexes of the blends were altered according to the plasticizer used and the use of TWEEN® 80. Thus, it was concluded that replacing glycerol with castor oil is feasible in TPS/PBAT blends.


Keywords


Crystallinity, XRD, Blends, TPS, PBAT.

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References


Akhavan, A.; Khoylou, F.; Ataeivarjovi, E. Preparation and characterization of gamma irradiated Starch/PVA/ZnO nanocomposite films. Radiation Physics and Chemistry, v. 138, p. 49-53, 2017.

Atrous, H.; Benbettaieb, N.; Hosni, F.; Danthine, S.; Blecker, C.; Attia, H.; Ghorbel, D. Effect of gamma-radiation on free radicals formation, structural changes and functional properties of wheat starch. International Journal of Biological Macromolecules, v. 80, p. 64-76, 2015.

Gani, A.; Bashir, M.; Wani, S. M.; Masoodi, F. M. Modification of bean starch by gamma-irradiation: Effect on functional and morphological properties. Lwt-Food Science and Technology, v. 49, n. 1, p. 162-169, 2012.

Hwang, I. T.; Chan-Hee, J.; In-Choi, K.; Jae-Hak, C.; Young-Chang, N. Electron beam-induced crosslinking of poly(butylene adipate-co-terephthalate). Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, v. 268, n. 21, p. 3386-3389, 2010.

Kumar, P.; Prakash, K. S.; Jan, K.; Swer, T. L.; Jan, S.; Verma, R.; Deppika, K.; Dar, M. Z.; Verma, K.; Bashir, K. Effects of gamma irradiation on starch granule structure and physicochemical properties of brown rice starch. Journal of Cereal Science, v. 77, p. 194-200, 2017.

Moustafa, H.; Guizani, C.; Dufresne, A. Sustainable biodegradable coffee grounds filler and its effect on the hydrophobicity, mechanical and thermal properties of biodegradable PBAT composites. Journal of Applied Polymer Science, v. 134, n. 8, p. 11, 2017.

Pan, H. W.; Ju, D. D.; Zhao, Y.; Wang, Z.; Yang, H. L.; Zhang, H. L.; Dong, L. S. Mechanical Properties, Hydrophobic Properties and Thermal Stability of the Biodegradable Poly(butylene adipate-co-terephthalate)/Maleated Thermoplastic Starch Blown Films. Fibers and Polymers, v. 17, n. 10, p. 1540-1549, 2016.

Sathiskumar, P. S.; Madras, G. Synthesis, characterization, degradation of biodegradable castor oil based polyesters. Polymer Degradation and Stability, v. 96, n. 9, p. 1695-1704, 2011.

Schlemmer D.; Sales M. J. A.; Resck I. S. Preparação, caracterização e degradação de blendas PS/TPS usando glicerol e óleo de buriti como plastificantes. Polímeros: Ciência e Tecnologia, v. 20, n. 1, p. 6-13, 2010.




DOI: https://doi.org/10.34117/bjdv6n3-005

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