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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.

Type
Articles
Copyright
Copyright © Materials Research Society 2012

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