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2013-03-12 - Colloque/Présentation - poster - Anglais - 1 page(s)

Ligot Sylvie , Renaux F., Dubois Philippe , Snyders Rony , "Plasma polymerization of ethyl lactate" in La matinée des chercheurs, Mons, Belgique, 2013

  • Codes CREF : Chimie macromoléculaire (DI1315)
  • Unités de recherche UMONS : Matériaux Polymères et Composites (S816)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Centre d’Innovation et de Recherche en Matériaux Polymères (CIRMAP)

Abstract(s) :

(Anglais) Plasma polymerization of ethyl lactate S. Ligot1, F. Renaux², L. Denis1, D. Cossement², R. Snyders1,2 1Chimie des Interactions Plasma Surface, CIRMAP, Université de Mons, Place du Parc 20, B-7000 Mons, Belgium. 2Materia Nova Research Center, Parc Initialis, Avenue N. Copernic 1, B-7000 Mons, Belgium. By being truly biodegradable and derived from renewable resources, polylactide (PLA) has gained enormous attention as an alternative to conventional synthetic packaging materials. Nevertheless, PLA presents high water and gas permittivity which lead to a high degradation rate by hydrolysis of the ester bonds. In order to improve the barrier properties of PLA substrate, we propose to coat it with a highly cross-linked PLA-based plasma polymer film (PPF) synthesized by Plasma Enhanced Chemical Vapor Deposition (PECVD). The control of chemical composition and cross-linking degree would allow us to tune the gas permittivity and, as a consequence, the degradation rate of the PLA substrate. The first step of the project is to determine the influences of the working parameters (RF power, pressure and precursor flow rate) on the films properties through an experimental design. The deposited PPF films are studied in terms of chemistry and cross-linkage by XPS, FTIR spectroscopy and Tof-SIMS measurements. In addition, in-situ IR spectroscopy is used to probe the plasma in order to get understanding on the plasma-surface interactions during the growth processes. By playing mainly with power, we are able to vary the atomic ratio C/O in the coatings from 2.5 to 9.3. This decreasing of O content percentage is due to the loss of O-C=O and C-O functions, respectively, from 15 to 0 % and from 21 to 5 %. The in situ FTIR spectroscopies confirm the loss of oxygenated functions with power, but in the benefit of alkyne groups.