|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|26082||43933||2016||5 صفحه PDF||ندارد||دانلود رایگان|
• The whole film (80 μm thickness) was investigated by using CRM, the double bond conversion of every depth was calculated too.
• The concentration of initiator and oxygen in the surface layers greatly infect the double bond conversion at different depth.
• The stronger light intensity an light dosage effectively improve the ability of preventing oxygen-inhibition.
• Higher light dosage bring more cracking of initiator, more free radicals can initiate double bond polymerization.
The oxygen inhibition in free radical photo-polymerization is one of the big issues, because it causes the incomplete double bond conversion (DBC) of the (meth)acrylate, especially on the surface which decreases the mechanical properties of the coatings. Until now, it is still difficult to measure the effect of oxygen, because the concentration of oxygen inside the coatings depends on the penetration of oxygen and the distance from surface exposed the air. In this research, laser Con-focus RAMAN Spectroscopy was used to investigate the double bond conversion in different distance from the surface of coatings, which could provide detail information of effect of oxygen concentration on double bond conversion. At the same time, the effect of light dosage and concentration of photo-initiators on double bond conversion was investigated as well. This data could guide the end use of UV coatings to overcome the oxygen inhibition.
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 325, 1 July 2016, Pages 83–87