Knowledge base

The inhibitory effect of oxygen on the photoinitiated polymerization of a polyurethane-acrylate resin has been completely eliminated by operating in a carbon dioxide atmosphere. The high-speed polymerization was followed in real-time by infrared spectroscopy, thus allowing conversion versus time curves to be directly recorded for curing reactions o

Dental filling composites based on dimethacrylates have been in clinical use for several decades. Byfree-radical polymerisation of the matrix monomers, a three-dimensional network is formed. Theselection of the monomers strongly influences the reactivity, viscosity and polymerisation shrinkage of the composite material, as well as the mechanical pr

Radiation curing is a well established and highly efficient method for crosslinking of coatings, printing inks 1 Photoinitiators 2 the key component in such systems have a great influence on storage life, curing rate and curing depth, but also on double bond conversion (DBC) and surface cure. Among the large group of P1 structures, hydroxyalkyiphen

Radiation curing is a well established and highly efficient method for crosslinking of coatings, printing inks etc.' Photoinitiators 23 the key component in such systems have a great influence on storage life, curing rate and curing depth, but also on double bond conversion (DBC) and surface cure. Among the large group of P1 structures, benzophenon

In the UV-curable formulations the most important component is very often the oligomer. Its choice exercises the control over some chemical and physical characteristics affecting the properties of the UV-cured materials, such as ,) gloss, ii) chemical resistance, iii) scratch resistance, ii,) mechanical resistance and non-yellowing 1]. These proper

UV-cationic curabTe silicone release coatings, which are based on cycloaliphatic epoxy-functional polydimethylsiloxane (CE-PDMS) in combination with onium salts, can be counted as well-established commercial products. Despite their good performance, such as not subjecting to oxygen inhibition and high throughput based on their high curing speeds, t

The role of multicomponent photoinitiating systems - based on various combinations of a bis imidazole derivative, an aminobenzophenone, an iodonium salt and an amine - in the photopolymerization of an acrylate formulation under light irradiation at 365 nm, has been investigated. Two photoinitiation processes occur a direct process where the light i

Fluoropolymers represent a group of rather specialized polymeric materials. The chemistry of the majority of fluoropolymers is derived from compounds used in the refrigeration industry.