Photocuring technologies

Cray Valley Product Guide (Photocure), Cray Valley, Paris (www.crayvalley.com) Mehnert, R., Pincus, A., Janorsky, I., Stowe, R. and Berejka, A., UV EB Curing Technology Equipment, Volume 1, John Wiley Sons, Ltd., Chichester/ SITA Technology Ltd., London, p. 6 (1998). 

Acrylic resins - [MAGNESIUMAND MAGNESIUM ALLOYS] (Vol 15) - [COATING PROCESSES - POWDER TECHNOLOGY] (Vol 6) -photocuring [RADIATION CURING] (Vol 20) -plasticization of [PLASTICIZERS] (Vol 19) -thiols m [THIOLS] (Vol 24)... 

Photo-DSC on the other hand, is a much more recent technique which has been developed thanks to technological developments in thermal analysis and coupled techniques. Until very recently, it has been used mainly to study photopolymerization or photocuring reactions by measuring the heat of reaction. We proposed the use of this powerful technique to study polymer photo-aging, using the photo-DSC as an accelerated aging device and coupled in situ analysis of the modification of the morphology of the materials. In this case, the crystallizability of the polymer is used as an indicator of the structural modifications. 

Vinyl ether and epoxy chemistry established more than 50 years ago finally found its way into radiation curing technology. These compounds have been demonstrated to be reactive monomers in curing processes photoinitiated by iodonium and sulfonium salts. In particular, vinyl ethers are known to be among the most reactive monomers in photocuring chemistry. 

In silicone chemistry, there has been recently a resurgent interest in the chemistry and technology of photocurable compositions derived from epoxy and vinyl ether silicones. Several types of silicones with vinyl and epoxy groups were designed [1, 2] which differ in functionality, spacer group and monomer content. The cured products have excellent physical properties and are of commercial interest in a number of areas. The crosslinking chemistry of such modifided silicones involves the well known cationic crosslinking/polymerization of vinyl ethers. The silicone unit acts basically as an internal solvent. The... 

NORBORNENE TERMINATED SILICONE FLUIDS Our efforts to expand this technology have also focused on the preparation a,o>-norbornenyl functional silicone fluids as precursors to photocured elastomers. The results of this work indicate that indeed, thiol-norbomene photoinitiated crosslinking will produce high elongation elastomers with physical properties comparable to those obtained from the photopx)lymerization of silicone acrylates (. These properties are listed below in Table V. The synthetic methodology that we... 

V. B. McKoy and A. Gupta. Photocurable acrylic composition, and UV curing with development of. US Patent 5 141990, assigned to California Institute of Technology (Pasadena, CA), August 25, 1992. 

I should also like to express my gratitude to Professor Lars Ake Linden, Head of the Department of Dental Materials and Technology, Karolinska Institute (Royal Institute of Medicine) who helped me in difficult moments in my life, and created the Polymer Research Group in his Department, which has allowed me to continue research on photodegradation and photocuring of polymeric materials in an atmosphere free of human envy. 

Matsuda, T., Miwa, H., Moghaddam, M.)., and lida, F. (1993) Newly designed tissue adhesion prevention technology based on photocurable mucopolysaccharides In vivo evaluation. ASAIO Trans., 39, M327-M331. 

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