Article

Accelerating effects of N-aryl-N′,N′-dialkyl ureas on epoxy-dicyandiamide curing system

  1. Xiang Dong Liu1,2,
  2. Mika Kimura2,
  3. Atsushi Sudo2,
  4. Takeshi Endo2,*

Article first published online: 1 OCT 2010

DOI: 10.1002/pola.24329

Issue

Journal of Polymer Science Part A: Polymer Chemistry

Journal of Polymer Science Part A: Polymer Chemistry

Volume 48, Issue 23, pages 5298–5305, 1 December 2010

Additional Information

How to Cite

Liu, X. D., Kimura, M., Sudo, A. and Endo, T. (2010), Accelerating effects of N-aryl-N′,N′-dialkyl ureas on epoxy-dicyandiamide curing system. J. Polym. Sci. A Polym. Chem., 48: 5298–5305. doi: 10.1002/pola.24329

Author Information

  1. 1

    Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, College of Materials and Textile, Zhejiang Sci-Tech University, Xiasha Higher Education Zone, Hangzhou 310018, People's Republic of China

  2. 2

    Molecular Engineering Institute, Kinki University, Kayanomori, Iizuka 820-8555, Japan

*Molecular Engineering Institute, Kinki University, Kayanomori, Iizuka, 820-8555, Japan

Publication History

  1. Issue published online: 28 OCT 2010
  2. Article first published online: 1 OCT 2010
  3. Manuscript Accepted: 18 AUG 2010
  4. Manuscript Received: 5 APR 2010

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Keywords:

  • accelerator;
  • cure;
  • dicyandiamide;
  • epoxy resin;
  • N-aryl-N′,N′-disubstituted urea;
  • urea derivatives

Abstract

This report focuses on epoxy-dicyandiamide (DICY) curing system accelerated by N-aryl-N′,N′-dialkyl urea, aiming at clarifying the accelerating mechanism and the relationship between accelerating effect and molecular structure of the accelerators. Nine N-aryl-N′,N′-dialkyl ureas were synthesized and investigated with measurements of differential scanning calorimetry, thermo gravimetric/differential thermal analysis and NMR spectroscopy. The results revealed that the ureas released the corresponding secondary amines by the thermal dissociation in the presence of epoxide, which led to the formation of tertiary amines that catalyze the addition reaction of DICY to epoxide. Moreover, a tendency that the ureas able to release more compact amines exhibited higher acceleration effects was discovered. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010

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