Abstract
Blends of poly (β-hydroxybutyrate-co-β-hydroxyvalerate) with poly (ε-caprolactone) were produced using melt mixing and solvent casting techniques. The biodegradation of blends was tested based in the ASTM G21-90 using Penicillium funiculosum fungal specie. The CO2 production during biodegradation was measured and fitted using the Gompertz model. Biodegradation of blends varies according to the mixing technique and the proportion of bacterial polymers in the blends. Although lag phase was larger, solvent-casted blends were easier to degrade due to their porous surface and relative lower crystallinity. P. funiculosum morphology during biodegradation appeared to be related to carbon availability i.e. larger and more complex conidiophores, more phialides per conidiophore and the presence of double-phialides, were found in blends with higher PHAs proportion. P. funiculosum morphology was independent to the blending technique used. Hence, morphology of P. funiculosum could be useful as a reference for carbon bioavailability of the blends.
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Acknowledgments
B. Vergara thanks to Consejo Nacional de Ciencia y Tecnología (CONACYT) for supporting scholarship 203514. Technical assistance in SEM of José Sepúlveda and Patricia Castillo from Universidad Autónoma Metropolitana-Iztapalapa (UAM-I) and in blends elaboration to Manuel Cervantes Uc and Alejandro May Pat from Centro de Investigación Científica de Yucatán (CICY) was strongly appreciated. Authors acknowledge support of Joel Alba Flores (CINVESTAV-IPN) for morphology identification and Luc Dendooven and Juan Corona (CINVESTAV-IPN) for reading the manuscript.
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Vergara-Porras, B., Gracida-Rodríguez, J.N. & Pérez-Guevara, F. Morphology of Penicillium funiculosum During Biodegradation of Poly (β-hydroxybutyrate-co-β-hydroxyvalerate) [PHBV] with Poly (ε-Caprolactone) [PCL] Blends. J Polym Environ 19, 834–840 (2011). https://doi.org/10.1007/s10924-011-0367-4
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DOI: https://doi.org/10.1007/s10924-011-0367-4