The Hydrophilic to Superhydrophilic Change Induced by Polyhydroxybutyrate in Polyethylene glycol:Polyhydroxybutyrate Ele
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The Hydrophilic to Superhydrophilic Change Induced by Polyhydroxybutyrate in Polyethylene glycol:Polyhydroxybutyrate Electrospun Samples by Plasma Treatment Ma Guadalupe Rojano-Molina1, Maraolina Domínguez-Díaz2*, Horacio Martinez-Valencia3, José Escorcia-García4, Ruth Fabiola Balderas-Valadez2 1
Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma del Estado de Morelos Av. Universidad No. 1001, Col. Chamilpa, Cuernavaca, Morelos, C.P.62209, MÉXICO 2 Centro de Investigación en Ingeniería y Ciencias Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad No. 1001, Col. Chamilpa, Cuernavaca, Morelos, C.P.62209, MÉXICO 3 Instituto de Ciencias Físicas-UNAM, Av. Universidad S/N, Col. Chamilpa, Cuernavaca, Morelos, C.P.62210, MÉXICO 4 CONACYT-CINVESTAV del IPN, Unidad Saltillo, Industrial, Zona Industrial, Ramos Arizpe, Coahuila, C.P. 25900, MÉXICO * To whom correspondence should be addressed: [email protected] ABSTRACT This work studied the effect of plasma treatment on the wettability of composite materials constituted of polyethylene glycol (PEG) and polyhydroxybutyrate (PHB) processed through the spin-coating and electrospinning techniques. For this purpose different polymeric solutions of PEG:PHB with proportions of 100:0, 80:20, 50:50, 20:80, and 0:100 were prepared. It found that the hydrophobicity of the as-prepared composite films processed by electrospinning was higher than those processed by spin-coating, using the same proportions of PEG:PHB. The electrospun samples with higher content of PHB (20:80 and 0:100) showed a surface morphology constituted by fibers of 1.7-1.9 μm in size. On the other hand, the electrospun samples processed with a lower content of PHB (100:0, 80:20, 50:50) did not form fibers and exhibited a rough surface. The subsequent plasma treatment with argon plasma of the electrospun samples produced a decrease in the contact angle, even in the samples with surface roughness. These contact angle values were similar to those obtained by spin-coating, or even lower, as in the case of the sample with PEG:PHB content of 20:80 in which the dip-coated film, the as-prepared membrane, and the plasma-treated membrane showed contact angles of 49°, 77.4°, and 0° (superhydrophilic) respectively. INTRODUCTION The wettability is defined as the degree at which a specific type of liquid maintains its contact with a surface as a consequence of its chemical and physical conditions [1]. A common measurement of the wettability is through the contact angle (CA), which is the angle between a solid and liquid surface. Then, surfaces can be defined as hydrophilic with CA from 0 to 90° and as hydrophobic with CA from 90 to 180°. A surface is considered superhydrophobic when the CA is more than 150° and as superhydrophilic when the CA is less than 5° [2]. These aspects are important in cell culture in which is required low contact angles [3], because the hydrophilic materials improve the cell adhesion and promote molecular bioactivity inducing proliferation and
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