RadTech UV/EB Technology Conference & Expo 2008
May 4-7, 2008
Lakeside Center at McCormick Place
Chicago, Illinois - United States of America

NANOMATERIALS

Carbon Nanotube (CNT) Dispersions in UV-Polymerizable Formulations
Nguyen Lam, University of Houston-Downtown
Abstract: Building on previously reported work, new methods for dispersing carbon nanotubes (CNTs) in acrylate-functional, UV-polymerizable formulations have been developed. The effects of the the CNTs on the rheology of the liquid formulations are discussed along with an assessment of how the thermal and thermo-mechanical properties are affected by the type and level of CNT. Finally, the effects of using an AC- versus a DC-powered UV lamp system on the homogenity of the films is discussed.

Generation of Nanostructured Hydrogels through Photopolymerization
in Lyotropic Liquid Crystalline
C. Allan Guymon, University of Iowa
Abstract: Lyotropic liquid crystalline (LLC) self-assembling media has recently been used as photopolymerization templates in the generation of nanostructured hydrogels. Photopolymerization offers a number of advantages in this templating process including a high degree of temperature and initiation control, as well as the inherent rapid kinetics of the polymerization reaction. This study focuses on the influence of photopolymerization kinetics and temperature on the ultimate polymer and properties that result from templating hydrogels within various LLC geometries.

Halogen-Free, Radiation Curable High Refractive Index Materials
Z. Jeffrey Wang, CYTEC Industries, Inc.
Abstract: High refractive index (RI) materials, especially radiation curable high RI materials, have been used in a wide variety of optical, photonic and electronic applications. Recently, there are fast growing demands for new materials with even higher RI, higher performance, and especially, halogen-free because of the increasing environmental concerns. Achieving equivalent RI without the use of halogenated materials is a big challenge. Cytec has developed a unique, inorganic-organic hybrid nanocomposite technology platform to meet this challenge. The nanoparticle surface treatment significantly improves nanoparticle compatibility with acrylated resins, and importantly, minimizes viscosity increase. Unlike many nanoparticle dispersions which show various degree of haziness because of particle agglomerations, this inorganic-organic hybrid nanocomposite technology demonstrates excellent optical transparency. Technical results from Cytec's newly developed high RI technologies, along with existing technologies for comparison purpose, will be presented at the conference.

Influence of Polymerizable Surfactants on Dispersion and Mechanical
Properties of Clay-Photopolymer
Kwame Owusu-Adom, University of Iowa
Abstract: In this research, surfactants with reactive functionalities are used to modify clay surfaces for developing clay-photopolymer nanocomposites. Higher degrees of exfoliation occur in systems with polymerizable organoclay, and leads to higher modulus and thermal properties. Using polymerizable surfactants afford a bottom-up approach to material fabrication by the choice of functionality incorporated into the surfactants. This research presents a straightforward method of exfoliating clay particles without the use of heavy mechanical agitation in a solvent-free formulation.

Photopolymerization of Clay/polyurethane Nanocomposites Induced
by Intercalated Photoinitiator thro
Jun Nie, Beijing University of Chemical Technology
Abstract: 1173IPS was synthesized through the reaction of (3-Isocyanatopropyl)triethyloxysilane (IPS) and 2-hydroxy-2-methyl-1-phenylpropane-1-one (1173). The objective of this work is to intercalate photoinitiator into the montmorillonite(MMT) through Sol-Gel reaction of cationic triethyloxysilanepropylamineformylethyl trimethyl ammonium iodide (APS) and 1173IPS. The modified-clay was then mixed with urethaneacylate oligomer(CN962) and 1,6-hexanediol diacrylate (HDDA) to form polyurethane-nanoclay composites by photopolymerization. RTIR showed they had almost the same final conversion but different polymerization rate. XRD and TEM showed that the modified-clay was exfoliated and dispersed parallelly as multilayer in the organic matrix. The resulting polyurethane -nanoclay composites exhibited a well intercalation and a better thermal stability property.

UV-Curable Coatings with Nanotechnology-enabled Barrier Properties
Sally Ramsey, Ecology Coatings, Inc.
Abstract: Novel coatings were derived from a new approach to selection of "100% solids" polymerizable oligomers and monomers together with specific nano-material additives. The combination exhibits dramatically reduced water transmission and gas permeability on low cost porous substrates. For example, gas transmission was reduced up to 200 times and water transmission was virtually eliminated on filter paper. The technology provides a platform supporting new products in electronic, packaging and label materials.

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