Supertough UV-curable silane/silica gas barrier coatings on polymers

Abstract

Ultra-thin (10-500 nm) photo-polymerized γ-methacryloxypropyltriethoxysilane (MPMS) and vinyltrimethoxysilane (VTS) layers applied to SiO 2 coatings on polyethylene terephthalate films improved the oxygen barrier performance of the oxide coated films by more than two-fold, and the coating strain to failure from 1.5% to beyond 5%, depending on the processing conditions. The oxygen transmission rate of composite films was measured under tensile strain. The chemical conversion of both MPMS and VTS with two different photoinitiators was studied by means of photo-calorimetry experiments, with attention paid to the influence of temperature, UV-light intensity and photoinitiator concentration. The conversion data were analyzed using an n th -order kinetic model, including an Arrhenius dependence of the temperature and a power-law dependence of the light intensity on the reaction rate. The improvement in mechanical integrity of the silane/silica barrier coating, with a toughness as high as 80 J/m 2 was found to be controlled by the conversion state of the silane.

Effect of different post-treatments on the corrosion resistance and tribological properties of AZ91D magnesium alloy coated PEO

“…Three different sealing agents were used: Finally, after dip-coating application, samples (i) and (ii) were cured using an oven and sample (iii) using UV light [35].…”

Thin-Film Diffusion Barriers for Electronic Applications

“…For a cathode of 1 cm 2 area, the volume of Ca oxidized is V Ca ¼ (1 cm 2 ) Â 5 Â 10 À7 cm ¼ 5 Â 10 À7 cm 3 . The mass of Ca metal converted to hydroxide, using 1.54 g cm À3 as the density of Ca, is m Ca ¼ 7.7 Â 10 À7 g. The corresponding mass of water to oxidize this mass of Ca is, according to the chemical reaction equation above: M here refers to the molecular weights.…”

Polymer Network Formation Using the Phosphane–ene Reaction: A Thiol–ene Analogue with Diverse Postpolymerization Chemistry

“…Polymer networks are cross-linked polymers that have found widespread use in actuators, microelectronics fabrication, synthetic rubbers, coatings, tissue engineering scaffolds, and other areas. − The incredible diversity of these materials stems from their highly tunable nature, ranging from soft hydrogels to tough thermosets, with the properties dictated by the chemical functionalities in the network as well as their cross-link densities. , They can be synthesized thermally, but also photochemically, where the photochemical approach is generally referred to as photopolymerization or UV curing and provides the possibility for both spatial and temporal control over the polymerization process . While the vast majority of polymer networks are synthesized using free-radical polymerization of (meth)­acrylates, thiol–ene polymerization has garnered increasing popularity over the past decade as an alternative approach.…”