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Citation: SHI Ke-Yu, HOU Xin, HE Shang-Jin, DU Zong-Jie, ZHANG Bao-Long. Morphological and Impact Behavior of Epoxy Resin Toughened by Chain-extended Urea Containing Polyether[J]. Chinese Journal of Applied Chemistry, ;2002, 19(7): 625-628. shu

Morphological and Impact Behavior of Epoxy Resin Toughened by Chain-extended Urea Containing Polyether

1.
a State Key Laboratory of Adsorption and Separation Functional Polymer Materials, Department of Chemistry, Nankai University, Tianjin;
2.
b School of Materials Science and Engineering, Tianjini University, Tianjin

Corresponding author: ZHANG Bao-Long,
Received Date: 5 November 2001
Available Online: 3 April 2002
Fund Project: 国家自然科学基金(59473028) (59473028)天津市自然科学基金(983603111)资助项目 (983603111)

The fracture surface morphology of epoxy resin E-51/dicyandiamide(E-51/dicy) curing system toughened by chain-extended urea containing polyether has been investigated by SEM as function of the morphology, dynamic mechanical behavior and impact strength. The fracture surface of the modified systems was found to display tough fracture feature, markedly different from that of the unmodified system. A lot of microcave, i.e. microphase of rubber, could be observed in homogeneous distribution on the fractured surface of the modified systems. Presence of two-phase microstructure of the modified cured systems leads to the significant increase in impact strength. The impact strength of the modified system was affected by the amounts of chain-extended urea and the molecular mass of the PPG flexible spacer in the chain-extended urea, when the amounts of chain-extended urea was 14%(mass fraction), the highest impact strength of E-51/dicy/U₁(extended-chain urea containing PPG flexible spacer with molecular mass 1 000) system was achieved which was 8 times that of the unmodified E-51/dicy curing system.
- epoxy resin,
- chain-extended urea,
- toughening,
- morphology
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