Modification of polyurethane with novel blocking agent
Abstract
Purpose
Fluorinated polyurethane combines some virtues of polyurethane and fluorinated polymer, such as low water absorption, attractive surface properties, good wearability and high weatherability. Fluorocarbon chains have been incorporated into polyurethanes by fluorinated diisocyanates, chain extenders, polyether glycols, polyester glycols and end-cappers. However, the fluorinated polyurethane, which is prepared with monohydric fluorocarbon alcohol, is seldom reported. The purpose of this research is to prepare and apply the novel fluorocarbon alcohols with side chain to modify polyurethane as the blocking agent.
Design/methodology/approach
The novel fluorocarbon alcohol with side chain 2-methoxy-3-nonene perfluorinated oxygen propanol (MNPOP) can be prepared via alcoholysis reaction of methanol and 2,3-epoxypropyl perfluorinated nonene ether (EPPNE), which was prepared with etherification of hexafluoropropene trimer (HFPT) and 2,3-glycidol. Structures of EPPNE and MNPOP are confirmed with FTIR and NMR. The polyurethane can be modified when MNPOP is used as blocking agent.
Findings
In comparison with the conventional polyurethane, the hydrophobic property of fluorinated polyurethane is improved. However, the increase of tensile strength of modified polyurethane is not obvious because MNPOP belongs to monohydric alcohol. And the function of MNPOP in the modified polyurethane is the blocking agent. The thermal stability of conventional and modified polyurethane is almost the same because MNPOP is de-blocked and fluorocarbon chains have not been incorporated into polyurethanes when the temperature is more than 150°C.
Originality/value
The polyurethane is modified with the novel fluorocarbon alcohols with side chain, which functions as the blocking agent. The hydrophobic property of fluorinated polyurethane is improved.
Keywords
Acknowledgements
This work has been supported by the Science and Technology Department of Zhejiang Province under Grant No. 2010C31040. In addition, the financial supports of Zhejiang Provincial Natural Science Foundation of China (No. Y4100152) and Zhejiang University of Technology Natural Science Foundation (No. 20100202) are gratefully acknowledged.
Citation
Chen, L. and Jiang, W. (2014), "Modification of polyurethane with novel blocking agent", Pigment & Resin Technology, Vol. 43 No. 2, pp. 97-103. https://doi.org/10.1108/PRT-04-2013-0030
Publisher
:Emerald Group Publishing Limited
Copyright © 2014, Emerald Group Publishing Limited