Preparation of UV curable emulsions using PEG-modified urethane acrylates and their coating properties III: Effects of epoxy acrylate |
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| Authors: | Kyung-Do Suh Yong Seok Chon Ju Young Kim |
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| Affiliation: | (1) Department of Industrial Chemistry, College of Engineering, Hanyang University, Seoul 133-791, Korea, KR;(2) School of Chemical Engineering, Olin Hall, Cornell University, Ithaca, NY 14853-5201, USA, US |
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| Abstract: | Water-dispersible UV-curable urethane acrylate emulsions were prepared with polyethylene glycol (PEG)-modified urethane acrylates (PMUA), containing terminal hydrophilic polyoxyethylene chains. To improve physical properties of PMUA, epoxy acrylate (EA) having high thermal stability and hardness, was mixed with five kinds of PMUA containing different chain lengths of polyoxyethylene (POE). For PMUA/EA mixtures, the composition ratio of EA to PMUA and the chain length of POE greatly influenced the size of droplets of emulsions and the physical properties of their cured films. At higher EA to PMUA ratio, the physical properties decreased, which was due to phase separation between EA and PMUA. Phase separation was confirmed by scanning electron microscopy. Received: 13 September 1996/Revised: 27 November 1996/2 December 1996 |
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