Tülay Yılmaz İnan

Preparation and characterization of novel UV-curable urethane methacrylate difunctional monomers and their structure-property relationships, 1

Four new UV-curable cross-linking agents namely 2,2-bis(4-β-ethoxy urethane ethyl methacrylate phenyl)propane (HEPAIEM), 2,2-bis(4-β-ethoxy urethane ethyl methacrylate phenyl)6Fpropane (HEPFAIEM), 2,2-bis(4-β-ethoxy urethane ethyl methacrylate-3,5-dibromo phenyl)propane (TBHEPAIEM), and 5-tert-butyl-1,3-bis(4-ethoxy urethane methacrylate phenyl)benzoylbenzene (tBuHEPBIEM), which can be good candidates for UV-curable coating applications, were synthesized by reacting isocyanato ethyl methacrylate (IEM) with four different diols. The structures of the monomers thus prepared were characterized by FTIR, mass and 1 H NMR spectroscopies. Introduction of new difunctional cross-linking agents affected the mechanical and physical properties of UV-cured films. Addition of 10% cross-linking agents into the formulations caused an increase both in tensile strength and elongation, when compared with widely used di(ethylene glycol)diacrylate (DEGDA) containing films. Elongation values of TBHEPAIEM containing films were exceptions. Gel contents of the UV-cured polymeric films were found to be between 88-98%. Thermogravimetric analysis showed that there were not any noticeable changes in thermal oxidative stability of the films compared with DEGDA containing ones. On the other hand, HEPFAIEM and TBHEPAIEM containing films showed increases in char yields due to the presence of F and Br in their structures. Introduction of the new difunctional monomers lowered the water absorption values of the films somewhat proportional to the methyl group content of the x-linkers.

AG/ZN zeolite containing antibacterial coating for food packaging substrates

Antibacterial packaging is gaining a lot of importance in the food industry. Plastics such as polypropylene, polyethylene, polyamides, polyethylene terephthalate, polyvinylidene chloride copolymers, etc., and paper, paperboard, and aluminum foils have been used as food-packaging materials. In the past, aluminum foil had found wide application in food packaging since it has a high barrier to light, moisture, oxygen, other gases, and volatile aromas. It is believed that aluminum foil coated with antibacterial material may play a role in extending shelf life of ready-to-eat food products and increase the quality and safety of the food products. In this study, silver- and zinc-supported zeolite 4A was prepared by ion-exchange method. A 6—10 µm thick vinyl acetate lacquer with antibacterial zeolite was cast onto the aluminum foil. This aluminum foil was later exposed to bacterial growth test and was shown to exhibit a very good antibacterial property against Escherichia coli. These antibacterial coatings could be useful for aluminum foil/plastic film laminates.

Preparation and Characterization of Novel UV-Curable Ester Methacrylate Crosslinking-Agents and Their Structure-Property Relationships, 2

Four, new difunctional monomers namely 2,2-bis(4-ethoxyacrylatephenyl)propane (HEPAAC), 2,2-bis(4-ethoxyacrylatephenyl)6Fpropane (HEPFAAC), 2,2-bis(4-ethoxyacrylate-3,5-dibromphenyl)propane (TB-HEPAAC) and 5-tert-butyl-1,3-bis(4-ethoxyacrylate benzoyl)benzene (tBuHEPBAC) containing acrylic moiety, which can be good candidates as x-linking agents for UV curable coating applications, were synthesized by reacting acryloyl chloride with four different diols. The structures of the monomers thus prepared were characterized by FTIR, mass and 1 H NMR spectroscopies. Introduction of 10% of these new monomers into the UV-curable formulations, caused different behaviors in tensile strengths and elongations, when compared with diethylene glycol diacrylate (DEGDA) containing films. Both elongation and tensile strength values were decreased for TBHEPAAC and tBuHEPBAC containing films, while the same values of the films containing HEPAAC and HEPFAACs increased. Gel contents of the UV-cured polymeric films were found to be between 88-98%. Thermogravimetric analysis showed that there were not appreciable changes in thermal stability of the films compared to DEGDA containing ones. On the other hand, HEPFAAC and tBuHEPAAC containing films showed increased in char yields due to the presence of F and Br in their structures. Introduction of the new difunctional monomers lowered the water absorption values of the films somewhat proportional to the methyl group content of the x-linkers.