Abstract
Self-crosslinkable aqueous polyurethane (PU)/polyacrylate (PA) composite emulsion was obtained by radical copolymerization. Fourier transform infrared spectroscopy (FT-IR) result shows that the cross-linking reaction between the carbonyl group and the hydrazine group has happened. The influence of the hydrazide-carbonyl molar ratio and the PA content on the properties of the composite emulsions and their films were investigated. The results show that, under the optimal hydrazide-carbonyl molar ratio (n (hydrazine group)/n (carbonyl group) =1:1), the water absorption is 10.56 %, and the mechanical properties and thermal stabilities are both improved. As the PA content increases from 0 wt% to 15 wt%, the tensile strength increases from 5.7 MPa to 7.3 MPa and the gel content increases from 70.3 % to 87 %.
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Acknowledgments
This project was supported by the Graduate Innovation Fund of Shaanxi University of Science and Technology, and the authors thank the National Natural Science Foundation of China (contract grant number: 50973057; 51103081) for financial support.
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Li, X., Wang, X., Shen, Y. et al. Synthesis and characterization of self-crosslinked polyurethane/polyacrylate composite emulsion based on carbonyl–hydrazide reaction. J Polym Res 20, 270 (2013). https://doi.org/10.1007/s10965-013-0270-x
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DOI: https://doi.org/10.1007/s10965-013-0270-x