Surface Analysis of Plasma‐Deposited Polymer Films, 3

Abstract

Summary: Pulsed‐plasma‐deposited ethylene films were studied by time‐of‐flight static secondary ion mass spectrometry (ToF‐SSIMS) before and after exposure to ambient air. The influence of the external plasma parameters on the secondary ion mass spectra of plasma‐deposited ethylene films was investigated. From these data, information on the chemical character of the plasma‐deposited ethylene films was derived. The investigation of the effect of external plasma parameters on the chemical character of the plasma‐deposited ethylene films revealed that there were some drastic changes in the secondary ion mass spectra of the films. It was found that fragmentation and re‐arrangement of the monomer molecules in the plasma, which affects the chemical character of the deposited films, vary according to the external plasma parameters. When the plasma polymers are exposed to air, extensive oxygen incorporation occurs. The oxygen uptake is high at the beginning and then it levels of. Some indications for the formation and decay of peroxy radicals (COO•) and, subsequently, hydroperoxides (COOH) are found. It was observed that the oxygen uptake of the plasma deposited ethylene films increase when the plasma conditions become harder.

Improving the bonding between henequen fibers and high density polyethylene using atmospheric pressure ethylene-plasma treatments

“…Moreover, the peaks at 3030, 1605 and at 905 cm -1 could be attributed to the existence of vinyl groups in the deposited film [35,36]. Tibbit et al [37], Donohoe and Wydeven [38], Oran et al [39] and Swaraj et al [40] have pointed out that the plasma polymerization of ethylene yields a plasma-polyethylene polymer with different structural characteristics with respect to that obtained with conventional methods. The plasmapolyethylene polymer possesses chemical crosslinks, ramifications and unsaturated vinyl groups.…”

Tuning the Surface Properties of Oxygen-Rich and Nitrogen-Rich Plasma Polymers: Functional Groups and Surface Charge

“…Numerous studies have indicated that cell-surface interactions are governed by the physico-chemical properties of the surfaces such as chemical functional groups, surface energy, roughness and surface charge [13,[19][20][21][22][23][24][25][26]. These interactions can be classified as either physical (adsorption), or chemical (covalent bonding) or a combination of both, e.g., electrostatic attraction of a bio-molecule onto an oppositely charged surface [27].…”

Modification of polyethylene surface using plasma polymerization of silane

“…1 Many attempts, involving physical and chemical interactions, have been made to improve the surface chemical and mechanical properties of polymer. 2 Plasma polymerization technique is considered to be a unique method of preparation of thin polymeric films and the application of this technique to several fields has been studied by various researchers.…”