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).
Photoinitiator - an overview | ScienceDirect Topics
网页Photoinitiators are molecules that absorb photons upon irradiation with light and form reactive species out of the excited state, which initiate consecutive reactions. The initiating species may be radicals, cations, or anions.
Recent Advances in Type I Photoinitiators for Visible Light Induced ...
网页2022年6月27日 · A huge variety of photoinitiators (PIs) and photoinitiating systems (PISs) have been developed that are able to generate reactive species, e. g. radicals, radical cations, and cations upon light absorption. In this Review, we focus on radical-generating Type I PIs which undergo homolytic cleavage after irradiation with visible light.
About Photoinitiators - Photoinitiators Platform
网页A photoinitiator is a molecule that creates reactive species (free radicals, cations or anions) when exposed to radiation (UV or visible). They initiate the polymerization process by adding themselves to the monomer or oligomer.
网页2022年6月27日 · A huge variety of photoinitiators (PIs) and photoinitiating systems (PISs) have been developed that are able to generate reactive species, e.g. radicals, radical cations, and cations upon light absorption. In this Review, we focus on radical-generating Type I PIs which undergo homolytic cleavage after irradiation with visible light.
Initiation and termination pathways in the photopolymerization …
网页2019年11月21日 · Photoinitiators are generally classified into two types [9]. The first group is Norrish type I photoinitiators, which undergo direct photofragmentation upon absorption of light and then form...
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.
A new function of photochromic spiropyran: an efficient photoinitiator …
网页2023年6月6日 · Photochromic spiropyran molecule shows a brand new function for serving as an efficient photoinitiator to activate two-photon photopolymerization, thus paving the way for developing a fast 3D ...
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.
From Light to Structure: Photo Initiators for Radical Two‐Photon ...
网页2022年2月24日 · Two-photon polymerization has established itself as one of the most important techniques for the fabrication of 3D structures in the micro to nanometer range. To ensure precise and rapid fabrication, photo initiators (PI) are used that have been specially developed for this purpose.
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.
Two-Photon Polymerization: Fundamentals, Materials, and …
网页Photopolymerization is achieved through the generation of reactive species by UV, visible, or infrared light in the presence of reactive monomeric or oligomeric materials. [12] Materials are generally split into two main categories for photopolymerization: radical or cationic.
The future of visible light photoinitiators of polymerization for ...
网页2023年4月3日 · Photopolymerization under visible light is an active research field whose intense research activity is supported by the recent advances in 3D and 4D printing. Within this perspective article, emerging trends in visible light photopolymerization for photocrosslinking applications will be presented.
Photoinitiators | Wiley Online Books
网页2021年4月5日 · Provides detailed information about excited state processes, mechanisms and design of efficient photoinitiator systems; Discusses the performance of photoinitiators of polymerization by numerous examples of reactions and application; Includes information on industrial applications; Presents a review of current …
Photoinitiator - an overview | ScienceDirect Topics
网页A photoinitiator is a compound that becomes electronically excited through absorption of light within a given spectral range, and undergoes subsequent reactions to afford reactive species capable of inducing an addition polymerization reaction.
Photoinitiators: A Review of Mechanisims and Applications
网页The objective of this paper is to review the current major classes of commercial photoinitiators, describe their mechanisms and discuss key properties which should be considered when choosing a photoinitiator for various applications.
A high-absorbance water-soluble photoinitiator nanoparticle for ...
网页2023年5月26日 · The photoinitiator (PI) is the main and critical component that should be considered to initiate the photopolymerization of a hydrogel, oligomer, or monomer 11. Applying light-based technologies...
Recent advances on water-soluble photoinitiators of …
网页2023年5月8日 · At present, only few visible light photoinitiators are soluble in water, speeding down the development of greener polymerization processes. In this review, an overview of the recent advances on water-soluble photoinitiating systems is provided.
The selection of photoinitiators for photopolymerization of ...
网页Photoinitiator is vital in triggering a rapid, accurate, and controllable photopolymerization, which has the capability to absorb specific wavelength of light radiation and creates reactive species, known as free radicals.
Highly efficient dandelion-like near-infrared light photoinitiator …
网页2019年8月8日 · Here we propose a NIR light free-radical photoinitiator (PI) fabricated by incorporating oxime-ester coumarin functionality on the surface of upconversion nanoparticles (UCNPs).
Photoinitiating systems and kinetics of frontal …
网页The most commonly used type of ionic photopolymerisation is the cationic one.84 In this type of photopolymerisation, monomers such as epoxides, oxetanes, and glycidyls are cured in the presence of photoinitiators, which act as photoacid generators.
Macromolecular Rapid Communications - Wiley Online Library
网页2022年5月17日 · In this work, instead of providing a comprehensive summary of photoinitiators used in 3D printing, we focus on these recently emerging trends in the development and application of advanced photoinitiators or photoinitiating systems for vat photopolymerization 3D printing mainly in last three years.
Photoinitiator – Wikipedia
网页Photoinitiator. Photoinitiatoren sind chemische Verbindungen, die nach Absorption von (UV-) Licht in einer Photolysereaktion zerfallen und so reaktive Spezies bilden, die eine Reaktion starten (initiieren) können (meist eine Polymerisation). Bei den reaktiven Spezies handelt es sich um Radikale oder um Kationen.
Systematic optimization of visible light-induced crosslinking
网页2021年12月2日 · In in presence of an appropriate photoinitiator, the light activation triggers the crosslinking process, which provides shape fidelity and stability at physiological temperature.
跳至内容