The Effects of 3-(3,4-dichloro phenyl)-1,1-dimethylurea on the Cure of Epoxy/Dicyandiamide System

3-(3,4-dichloro phenyl)-1,1-dimethylurea이 Epoxy/Dicyandiamide계의 경화에 미치는 영향

  • 김형순 (서남대학교 화학공학과) ;
  • 김완영 (전북대학교 공업화학과) ;
  • 김영자 (전북대학교 화학교육과)
  • Received : 1996.06.14
  • Accepted : 1996.07.26
  • Published : 1996.10.10

Abstract

Cure characteristics of DGEBA(diglycidyl ether of bisphenol A)/dicy(dicyandiamide) system containing diuron(3-(3,4-dichloro phenyl) -1,1-dimethylurea) as an accelerator was investigated. The system has shelf life of six months because dicy is insoluble in liquid/solid resins at room temperature. It is generally known that dicy is an adequate curing agent for one component adhesive due to its highly latent property. With increasing the amount of added dicy, reaction heat of DGEBA/dicy system increased and degree of conversion was not varied. For DGEBA/dicy/diuron system, cure temperature decreased about $40^{\circ}C$ and cure reaction became fast by the addition of diuron which activates dicy. $T_g$ of the mixed resin decreased with the amount of accelerator. which was interpreated with molecular structure forming loose chain. Cure kinetics of DGEBA/dicy and DGEBA/dicy/diuron system were explained using Kamal's autocatalytic reaction model. The effect of acceleration was confirmed with that reaction model.

Keywords

Acknowledgement

Supported by : 전북대학교

References

  1. Advanced in Polymer Science v.75 R. G. Schmidt;J. P. Bell
  2. Epoxy Resins-Chemistry and Technology(2nd ed.) C. A. May(ed.)
  3. J. Thermal Anal. v.2 T. Ozawa
  4. J. Res. Nat. Bur. Stds. v.57 H. E. Kissinger
  5. Polymer v.9 R. A. Fava
  6. Polymer J. v.23 no.7 J. S. Shim;W. Lee;J. Jang
  7. ANTEC '87 V. M. Gonzalez-Romero;N. Casillas
  8. J. Thermal Anal. v.30 J. P. Elder
  9. Polym. Eng. Sci. v.13 M. R. Kamal;S. Sourour
  10. J. Appl. Polym. Sci. v.29 J. Mijovic;J. Kim;J. Slaby
  11. J. Polym. Sci., A-1 v.8 K. Horie;H. Hiura;M. Sawada;I. Mita;H. Kambe
  12. Polymer v.20 M. E. Ryan;A. Dutta
  13. Polym. Eng. Sci. v.13 R. B. Prime