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Morphology-induced hydrophobic behavior of electrospun polyhydroxyalkanoate membranes

Published online by Cambridge University Press:  20 July 2012

Maraolina Domínguez-Díaz
Affiliation:
Lab. De Nanopolimeros y Coloides, Instituto de Ciencias Físicas, Universidad Nacional Autonoma de Mexico, Cuernavaca Mor. 62210, MEXICO Centro de Investigación en Ingeniería y Ciencias Aplicadas, UAEM, Cuernavaca Mor. 62210, MEXICO
Angel Romo-Uribe*
Affiliation:
Lab. De Nanopolimeros y Coloides, Instituto de Ciencias Físicas, Universidad Nacional Autonoma de Mexico, Cuernavaca Mor. 62210, MEXICO
Araceli Flores
Affiliation:
Instituto de Estructura de la Materia, C.S.I.C., Serrano 119, 28006 Madrid, SPAIN
Rodolfo Cruz-Silva
Affiliation:
Centro de Investigación en Ingeniería y Ciencias Aplicadas, UAEM, Cuernavaca Mor. 62210, MEXICO
*
*To whom correspondence should be addressed: aromo-uribe@fis.unam.mx
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Abstract

Biodegradable poly(3-hydroxybutyrate) -PHB- and the copolymers with poly (3-hydroxyvalerate) -PHB/HV, containing 5 and 12 mol% valerate (denoted PHB/5HV and PHB/12HV, respectively) were electrospun from chloroform solution at room temperature. The results showed that relatively low voltage and concentrations favored uniform filament formation in PHB, with filament diameters ranging from 3 to 7 micrometers. On the other hand, low molecular weight and low solution concentration favored uniform filament formation in the PHB/5HV copolymer. Strikingly, morphology of filaments and beads favored the membranes hydrophobic behavior; the membrane from PHB/12HV exhibited a water contact angle of 112°. In contrast, solution cast films from the PHAs exhibited water contact angles in the range of 65°. Analyses on the membranes morphology via scanning electron microscopy (SEM) revealed that filament diameter drives the degree of porosity and the hydrophobic behavior of the electrospun membranes.

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Articles
Copyright
Copyright © Materials Research Society 2012

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Morphology-induced hydrophobic behavior of electrospun polyhydroxyalkanoate membranes
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