title: Fogging Control on LDPE/EVA Coextruded Films: Wettability Behavior and Its Correlation with Electric Performance.
abstract: The transformation of fog at a non-visible water layer on a membrane of low-density polyethylene (LDPE) and ethylene-vinyl acetate (EVA) was evaluated. Nonionic surfactants of major demand in the polyolefin industry were studied. A kinetic study using a hot fog chamber showed that condensation is controlled by both the diffusion and permanency of the surfactant more than by the change of the surface energy developed by the wetting agents. The greatest permanency of the anti-fog effect of the LDPE/EVA surface was close to 3000 h. The contact angle results demonstrated the ability of the wetting agent to spread out to the surface. Complementarily, the migration of nonionic surfactants from the inside of the polymeric matrix to the surface was analyzed by Fourier transform infrared (FTIR) microscopy. Additionally, electrical measurement on the anti-fogging membrane at alternating currents and at a sweep frequency was proposed to test the conductivity and wetting ability of nonionic surfactants. We proved that the amphiphilic molecules had the ability to increase the conductivity in the polyolefin membrane. A correlation between the bulk electrical conductivity and the permanency of the fogging control on the LDPE/EVA coextruded film was found.
authors.affiliation: Innovación y Desarrollo en Materiales Avanzados A. C., Grupo POLYnnova, Carr. San Luis Potosí-Guadalajara 1510, Nivel 3, Local 12, Lomas del Tecnológico, San Luis Potosí 78211, Mexico. miguel.waldo@polynnova.mx.
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Waldo-Mendoza
authors.affiliation: Innovación y Desarrollo en Materiales Avanzados A. C., Grupo POLYnnova, Carr. San Luis Potosí-Guadalajara 1510, Nivel 3, Local 12, Lomas del Tecnológico, San Luis Potosí 78211, Mexico. zoe.vineth@polynnova.mx.
authors.forename: Zoe V
authors.initials: ZV
authors.lastname: Quiñones-Jurado
authors.affiliation: Innovación y Desarrollo en Materiales Avanzados A. C., Grupo POLYnnova, Carr. San Luis Potosí-Guadalajara 1510, Nivel 3, Local 12, Lomas del Tecnológico, San Luis Potosí 78211, Mexico. jcarlospm40@hotmail.com.
authors.forename: Juan C
authors.initials: JC
authors.lastname: Pérez-Medina
authors.affiliation: Instituto de Física "Manuel Sandoval Vallarta", Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, San Luis Potosí 78000, Mexico. byanez@ifisica.uaslp.mx.
authors.forename: Bernardo
authors.initials: B
authors.lastname: Yañez-Soto
authors.affiliation: Innovación y Desarrollo en Materiales Avanzados A. C., Grupo POLYnnova, Carr. San Luis Potosí-Guadalajara 1510, Nivel 3, Local 12, Lomas del Tecnológico, San Luis Potosí 78211, Mexico. pedro.e.ramirez.g@gmail.com.|Instituto de Física "Manuel Sandoval Vallarta", Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, San Luis Potosí 78000, Mexico. pedro.e.ramirez.g@gmail.com.
authors.forename: Pedro E
authors.initials: PE
authors.lastname: Ramírez-González
keywords: AC electrical conductivity; coextruded films; ethylenevinyl acetate; low-density polyethylene; nonionic surfactants; wettability