Some Effects of Corona Plasma Treatment of Polylactide/Montmorillonite Nanocomposite Films

Abstract

Influence of the unit energy (Eu) of corona discharge used for modification of pure polylactide (PLA) and polylactide nanocomposite (PLAC) containing 5 wt% of an aluminosilicate nanofiller (Cloisite 30B) on water (ΘW) and diiodomethane (ΘD) contact angles as well as on surface free energy (γs) of these polymers was studied. ΘW and ΘD as advancing contact angles were measured with use of a goniometer while γs was calculated by the Owens–Wendt method. It was found that ΘW increased with the rising Eu while ΘD remained approximately constant. Assuming Eu = const, it could be stated that the increase in γs was much more evident for PLA than for PLAC. This increase resulted practically from the change in the polar component of γs because the dispersive component for the two materials only slightly decreased with increase in Eu.

Searching for Natural Conductive Fibrous Structures via a Green Sustainable Approach Based on Jute Fibers and Silver Nanoparticles

“…These oxidants, combined with the free radicals of the material surface, can create oxidizing groups, for example, carboxyl groups. The introduction of these polar groups on the material’s surface could increase the surface energy, improving the wettability and adhesion properties of the materials [ 37 ]. The presence of these carboxyl groups can also be very important for nanoparticles formation: some works describe the need to use oxidizing agents like TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) in order to facilitate the reduction of the silver nanoparticles [ 29 , 38 ].…”

Multilayer Films Based on Poly(lactic acid)/Gelatin Supplemented with Cellulose Nanocrystals and Antioxidant Extract from Almond Shell By-Product and Its Application on Hass Avocado Preservation

“…Only one face of the PLA films was treated with the corona discharge under industrial conditions (ambient air and 23 • C) [21] by using a BD-20ACV corona treater (Electro-Technic Products, Inc., Chicago, IL, USA) with a custom power-line filter and a transistorised generator (rated power: 220 V; output frequency: 4-5 MHz) transformer of rated voltage 10-48 kV. The 76 mm field effect electrode was passed back and forth approximately 6 mm above each bonding surface with a treatment surface of 0.011 m 2 .…”

Investigación de la influencia del tipo de gas utilizado en el plasma atmosférico, en la modificación superficial del polipropileno

“…(S. Sapieha et al 1993, J. B. Lynch 1999, S. Yang et al 2004, C. Tendero 2005, M. M. Hossain et al 2006, M. Zenkiewicz et al 2009 El tratamiento con plasma corona se aplica en films, láminas o películas de pequeño espesor, donde la energía es aplicada por un rodillo metálico el cual genera alta tensión y elevada frecuencia. Esta técnica se utiliza como pretratamiento, la cual se aplica al mismo instante que se extruye el material, en la misma línea de trabajo.…”