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Citation: YANG Jian-Wen, ZENG Zhao-Hua, WANG Zhi-Ming, CHEN Yong-Lie. Polymethacrylate Modified Polyurethane as Photocurable Waterborne Coatings[J]. Chinese Journal of Applied Chemistry, ;2001, 18(8): 631-635. shu

Polymethacrylate Modified Polyurethane as Photocurable Waterborne Coatings

1.
Institute of Polymer Science, Zhongshan University, Guangzhou 510275

Received Date: 8 October 2000
Available Online: 30 March 2001
Fund Project: 广东省自然科学基金资助课题(960019) (960019)

A conventional polyurethane-acrylate(PUA) with carboxyl as pendant group was prepared from dimethylolpropionic acid, polyethylene glycol, tolylene-2,4-diisocyanate and hydroxyethyl methacrylate. A modified PUA(g-PUA) with carboxyl group was obtained by grafting the PUA onto the copolymer of glycidyl methacrylate and methyl methacrylate through the reaction between the glycidyl and part of the carboxyl groups. The PUA and g-PUA could be easily dispersed in water in the form of self-emulsified latex after neutralization by triethylamine. The interfacial tension of the acquired dispersions was lower than that of deionized water. The investigation of photocuring on differential photocalorimeter showed that the g-PUA could polymerize to a greater extent than the conventional PUA. The glass transition termperature, thermal stability and physical properties of the cured films from the conventional PUA and the g PUA dispersions were measured. The effects of molecular weight of polyethylene glycol used on the above properties were also investigated.
- UV-curable,
- waterborne coating,
- polyurethane acrylate,
- acrylate copolymer,
- graft copolymer
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