Ouali, Salma

Monitoring of abiotic degradation of photocrosslinked silicone acrylate coatings: the fate of the photoinitiator by Salma Ouali( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Contribution à l'évaluation du comportement des revêtements silicones acrylates photoréticulés en fin de vie. Influence du système de photoamorçage sur la dégradation bio-physico-chimique by Salma Ouali( Book )

2 editions published in 2017 in French and held by 2 WorldCat member libraries worldwide

Photocrosslinked silicones acrylates are widely used in coatings of various materials. Their production requires the use of photoinitiator considered as potentially reprotoxic, which requires producers of silicone coatings to devise alternative formulations. Consumption increase of this type of coatings raises questions about their fate during and at their end-of-life in waste treatment channels and the influence of photoinitiator change on the environmental behavior of the coatings. This research area needs the use of a specific methodology, combining physico-chemical and biological degradation experiments. Two types of coatings photocrosslinked by two different photoinitiators: Darocur 1173 and modified Darocur 1173 (new photoinitiator) are the subject of this study. UV exposure of silicone coatings showed that these materials are easily degradable and sensitive to photoageing. The silicone coating increases the photosensitivity of coated films. At the end-of-life stage, performed experiments on silicone coatings revealed a slight chemical hydrolysis of the non-biodegradable siloxane chains, both under aerobic and anaerobic conditions. However, these materials does not inhibit the microbial activity. The tested photoinitiators have totally different behavior regarding the leaching and biological degradation: Darocur 1173 is very mobile in aqueous phase, easily assimilated by microorganisms as a primary sole of carbon under aerobic conditions in contrast to modified Darocur 1173. Whether there has been biodegradation or not, the structure of microbial communities is influenced differently depending on the used photoinitiator. Modified Darocur 1173 reduces the risk of migration and its potential toxicity in silicone coatings. The implemented approach brings a lot of information about the environmental impacts and can serve as an example for the study of other silicone waste

Leaching and Biodegradation of Darocur 1173 used as a Photo-Initiator in the Production of Photocrosslinked Silicone Acrylates by Salma Ouali( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Global portfolio diversification with cryptocurrencies by Salma Ouali( Book )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide