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Polymer Bulletin

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12-05-2018 | Original Paper

Diisocyanate type effects on flexibility and coating performance of UV-curable hard coatings based on tetrafunctional urethane acrylates

Authors: Yeun-Kyung Cho, Seok-Ho Hwang

Published in: Polymer Bulletin | Issue 12/2018

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Abstract

Tetrafunctional urethane acrylates based on different types of diisocyanates were synthesized and were then used to prepare a series of five UV-cured hard coatings on polycarbonate (PC) substrate. The coating syrups consisted of the urethane acrylate with reactive hardening acrylic monomer (PETA; pentaerythritol tetraacrylate) and reactive diluent (hydroxyethyl acrylate). Their flexibilities and coating performance were investigated from the tribology results and transparency of the UV-cured hard coatings on PC substrate. The tribological properties showed better result when the content of PETA was increased in all of the UV-cured hard coating series. The surface hardness order of the UV-cured hard coating series was toluene diisocyanate (TDI) > toluene diisocyanate (IPDI) > 4,4′-methylenebis(phenyl isocyanate) (MDI) > 4,4′-methylenebis(cyclohexyl isocyanate) (HMDI) > 4,4′-methylenebis(cyclohexyl isocyanate) (HDI). However, their flexibilities demonstrated by critical bending radius showed the reverse order to the hardness results. All UV-cured hard coatings had a transmittance of over 89% in the visible wavelength range.

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Title: Diisocyanate type effects on flexibility and coating performance of UV-curable hard coatings based on tetrafunctional urethane acrylates
Authors: Yeun-Kyung Cho
Seok-Ho Hwang
Publication date: 12-05-2018
Publisher: Springer Berlin Heidelberg
Published in: Polymer Bulletin / Issue 12/2018
Print ISSN: 0170-0839
Electronic ISSN: 1436-2449
DOI: https://doi.org/10.1007/s00289-018-2363-5

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