Knowledge base

Various orthopaedic methods for the fixation of fractured bone or after removal of bone tumours are currently in clinical use. Autografts, tissue obtained from another site in the same subject of the same species, are the gold standard for tissue repair and substitution. However, the use of autografts has some serious disadvantages, such as additio

Investigations were undertaken to find the influence of the initial viscosity of a photocurable system on its photopolymerization kinetics. The model monomers were methacrylic acid (MAA) and bis-GMA. The initial viscosities of the systems were manipulated by adding to the monomers a constant amount (by weight) of poly(oxyethylene)diols of various m

A new type of urethane acrylate oligomers, which have grafted photoinitiators (PIs), is described. Commercially available PIs with hydroxylalkyl substituents were grafted in a level 0.5-5.0 wt.% to oligomers during oligomers syntheses. These oligomers got a name of UV-light sensitive (LS®) oligomers. Coating formulations containing LS® oligomers do

To respond to an increasing demand for new high performance oligomers for UV formulations, new hyperbranched oligomer structures have been developed. They offer an interesting new look at UV curing chemistry. It will be shown in this paper that compared to traditional structures, hyperbranched materials offer lower viscosity at given molecular weig

The authors recently found many new addition reactions of oxetanes with certain reagents such as phenols and carboxylic acids using certain quaternary onium salts or crown ether complexes as catalysts. More recently, we also found new anionic ring-opening polymerization of oxetaries containing pendant hydroxyl groups and alternating anionic ring-op

UV curing technology is increasingly used also in complex 3D applications. In order to achieve a consistent curing quality for the products, UV irradiation should be as homogenous as possible across the 3D workpiece surface. In the industry there is a strong demand for helpful tools for the planning and optimization of 3D curing processes. A new co

The work presents the results of a photo-induced copolymerization of dodecyl methacrylate (DDM) with ethylene-, diethylerie-, triethylene-, tetraethylene- and polyethylene glycol dimethacrylates (EGDM, DEGDM, TEGDM, TtEGDM and PEGDM, resp.). The influence of the comonomer ratio and the length of the dimethacrylate spacer group on the polymerization

3D printing using UV curable compositions is an emerging technology developed and perfected at Objet Geometries Ltd. which combines Ink-jet and UV-Curing technologies to build 3-dimensional objects directly from CAD (Computerized Aided Design) data. This technology being far less expensive than traditional rapid prototyping technologies is also off