Photoinitiation mechanisms and photogelation kinetics of blue …
网页2020年8月18日 · Fluorescence and UV–vis spectroscopies were used in combination with molecular orbital computations to characterize the photochemical behaviors of the five bicomponent photoinitiators, explore the possible electron transfer pathways of the photoinitiation processes, and quantify photopolymerization efficiencies.
Photoinitiator - Wikipedia
网页In chemistry, a photoinitiator is a molecule that creates reactive species (free radicals, cations or anions) when exposed to radiation (UV or visible). Synthetic photoinitiators are key components in photopolymers (for example, photo-curable coatings, adhesives and dental restoratives).
Photoinitiated Polymerization: Advances, Challenges, and …
网页2010年6月16日 · The use of photoinitiated polymerization is continuously growing in industry as reflected by the large number of applications in not only conventional areas such as coatings, inks, and adhesives but also high-tech domains, optoelectronics, laser imaging, stereolithography, and nanotechnology.
网页The photoinitiator (PI) absorbs radiation over the range of 250-450 nm, resulting in the formation of the electronically excited state photoinitiator (PI*). As most photoinitiators are derivatives of aromatic ketones, the active excited state is generally the triplet state.
Recent Advances in Type I Photoinitiators for Visible Light Induced ...
网页2022年6月27日 · In the recent past, a number of novel radical photoinitiators, applicable under visible-light illumination, have been developed to improve biocompatibility, water solubility and performance.
Cationic Polymerization: From Photoinitiation to Photocontrol ...
网页A myriad of photoinitiating systems have been developed, thus allowing polymerization of a broad array of monomers (e.g., epoxides, vinyl ethers, alkenes, cyclic ethers, and lactones) under practical, inexpensive, and environmentally benign conditions.
Photoinitiating System - Photoinitiators - Wiley Online Library
网页2021年4月5日 · This chapter discusses the characteristics and the role of the photoinitiating system, the approach of the (photo)chemical reactivity through an analysis of the excited state processes and molecular orbital calculations. The properties that should fulfill a PIS falls into two categories: practical properties oriented to the end uses, and ...
Coumarin Derivatives as Photoinitiators in Photo-Oxidation and …
网页New multicomponent photoinitiating systems (PISs) based on these coumarins are proposed for the free radical polymerization (FRP) of (meth)acrylates and examined upon visible light irradiation using a light-emitting diode (LED) as a safe and economical irradiation source.
Two-Color Single-Photon Photoinitiation and Photoinhibition for …
网页2009年4月9日 · Here, we demonstrate a two-color irradiation scheme whereby initiating species are generated by single-photon absorption at one wavelength while inhibiting species are generated by single-photon absorption at a second, independent wavelength.
Photoinitiators of polymerization with reduced environmental …
网页2021年1月5日 · The development of new procedures aiming at reducing the environmental impact of polymerization processes is a major societal issue. In this field, light-assisted polymerization and especially visible light photopolymerization can address this issue by enabling in the future, Sun, to be used as the irradiation source.