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Citation: ZHANG Jian, HAN Xiao-Zu. Morphology and Mechanical properties of Cured Epoxy Resin/Imidazole System Toughened by Liquid Rubber[J]. Chinese Journal of Applied Chemistry, ;2005, 22(12): 1333-1337. shu

Morphology and Mechanical properties of Cured Epoxy Resin/Imidazole System Toughened by Liquid Rubber

ZHANG Jian ^, ,
HAN Xiao-Zu

1.
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: ZHANG Jian,
Received Date: 24 December 2004
Available Online: 23 June 2005

The morphology of cured epoxy resin/imidazole system toughened by terminal functional liquid rubber has been investigated via SEM and TEM techniques.The presence of a tow-phase micro-structure was observed in modified cured systems in which the rubber micro-phase distributed in island form in the conti-nuous phase of the epoxy resin network.In fact,only when the domain size of the rubber phase is 1~3 μm,may the toughening result be optimum.The critical fracture energy release rate(G_IC) could be improved more than ten times,and the tensile strength increases by 2~3 times,and the impact strength nearly doubles,when the DEGBA/imidazole cured system is toughened by CTBN at optimum level.The dynamic mechanical analysis indicated that the glass transformation temperature(T_g) of the cured system toughened by CTBN was reduced,because the CTBN cured imperfectly or dissolved incompletely in the modified cured system and plastisized the matrix.
- HTBN,
- CTBN,
- toughened epoxy resin,
- morphology,
- mechanical property
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