Investigation of the curing process of spray polyurea elastomer by FTIR, DSC, and DMA

Qing Zhou; Li Cao; Qing Li; Yalin Yao; Zhaofei Ouyang; Zhiqiang Su; Xiaowei Chen

doi:10.1002/app.36674

journal article Feb 20, 2012

Investigation of the curing process of spray polyurea elastomer by FTIR, DSC, and DMA

Qing Zhou

Li Cao

Qing Li

Yalin Yao Zhaofei Ouyang Zhiqiang Su

Xiaowei Chen

Journal of Applied Polymer Science Vol. 125 No. 5 pp. 3695-3701 · Wiley

View at Publisher Save 10.1002/app.36674

Abstract

AbstractThe curing process of a typically formulated spray polyurea elastomer (SPUA) system has been thoroughly investigated with the help of a combined analysis of Fourier transform infrared spectroscopy, differential scanning calorimetry, and dynamic mechanical analysis. The evolvement of the microstructure and mechanical responses of the SPUA system during the curing process have been described in detail. The experimental results indicated that the fast curing property of SPUA, which mainly based on the reaction between the primary amine groups and the isocyanate groups, led to the formation of the unstable hard segments in the interphase. After the tack‐free time, the residual isocyanate groups continued to react with the rest of the secondary amine groups of the chain extenders for several hours and caused the increase of the molecular weight of the hard segment in SPUA. Furthermore, during the curing process, the “disordered” hydrogen bond formed by one CO and one nearby NH (secondary amine) reconstructed to “ordered” bond, which contributed to the increase of the content of the hard segment and ultimately, improved the mechanical properties of the SPUA system greatly. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Citations

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References

Details

Published: Feb 20, 2012
Vol/Issue: 125(5)
Pages: 3695-3701
License: View

Authors

Shanghai University

1 Key Laboratory of RNA Biology,; 2 Beijing Key Laboratory of Noncoding RNA, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China,; 4 Core Facility for Protein Research, Institute of Biophysics,

Cite This Article

Qing Zhou, Li Cao, Qing Li, et al. (2012). Investigation of the curing process of spray polyurea elastomer by FTIR, DSC, and DMA. Journal of Applied Polymer Science, 125(5), 3695-3701. https://doi.org/10.1002/app.36674

Investigation of the curing process of spray polyurea elastomer by FTIR, DSC, and DMA

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