Journal
MATERIALS
Volume 8, Issue 6, Pages 3671-3684Publisher
MDPI
DOI: 10.3390/ma8063671
Keywords
modification; toughen; TGDDE; dimer fatty acid (DFA); curing reaction
Categories
Funding
- foundation of Hubei Provincial Engineering Laboratory for Resin Matrix Structural and Functional Composite Materials [JX0100.0172]
Ask authors/readers for more resources
Recent experimental results showed that the T-g of cured resin scarcely decreased and the impact strength of resins increased by over 50% when a tetrafunctional epoxy named N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenyl ether (TGDDE) was introduced to an appropriate flexible chain from a dimer fatty acid (DFA). In order to understand the reason for this phenomenon, the modification and the chemical structure of the prepolymer together with the curing reaction and the viscoelasticity of the cured resins were studied in detail in the present work. The results indicated that the modification would help the prepolymer improve its molecular mobility. As a result, the resins could be further cured, resulting in the cross-linking density increasing. This is because the curing efficiency was increased, but the tetrafunctional epoxy was not cured completely due to its large steric hindrance. Moreover, the flexibility of some parts of the networks was improved, which was beneficial for the toughness of the cured resins. Therefore, the toughness of the tetrafunctional resin was improved with little influence on the thermal properties when the epoxies were modified with an appropriate content of DFA.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available