Effect of glow discharge plasma on surface modification of chitosan film

Glow discharge plasma (GDP) was used to modify chitosan films to obtain desirable properties. The chitosan films were treated with GDP of 0-800 W for 1 min, respectively. The molecular structure of chitosan films changed under GDP treatment. Chitosan films showed an enhancement of crystallinity with the increasing power of GDP, and the GDP treatment provided them with higher thermal stability, manifested as the exothermic peaks shifted from 291.5 degrees C (0 W) to 294.1 degrees C (800 W). Scanning electron microscope (SEM) indicated that the surface of chitosan films got rougher with 0-600 W GDP treatment, accompanied by the increase of tensile strength (TS), and the TS did not increase with the 800 W GDP treatment. However, the water vapor permanent (WVP) became higher with GDP treatment. GDP treatment also exhibited influence on chromatic aberration of chitosan films. GDP is proved to be a promising green, pollution-free, rapid technology to modify chitosan films. (C) 2019 Elsevier B.V. All rights reserved.