期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 230, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2022.109787
关键词
Toughen; Co-polyimide; Nano-sized phase separation; Impact strength; Tensile strength
资金
- Key Research and Development Program of Shanxi Province [202003D111002]
- Major Science and Technology Project in Shanxi Province [202101040201003]
- National Natural Science Foundation of China [51903249]
- Innovation Fund Project of Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences [SCJC-XCL-2022-12]
In this study, a hydroxyl-functionalized block co-polyimide was synthesized and used to toughen tetrafunctional epoxy resins, resulting in significantly improved impact strength and tensile strength. This method provides an effective approach for preparing tough tetrafunctional epoxy resins.
Tetrafunctional epoxy resins are widely used as matrix of advanced composite materials due to their excellent high temperature performance. However, the highly crosslinking density of tetrafunctional epoxy resins results in an inherent brittleness, which limits its further application. In this work, hydroxyl-functionalized block co-polyimide (BPADA-ODA/HAB) is first synthesized by the condensation of 3,3 '-Dihydroxybenzidine and 4,4 '- Diaminodiphenyl ether with 4,4'-(4,4 '-isopropylidenediphenoxy) di-phthalic anhydride, and used to toughen tetrafunctional epoxy resins. The co-polyimide molecules provide reactive blocks that participate in the curing reaction of epoxy resin and decrease the crosslinking density of epoxy resin; the co-polyimide can form nano-sized separated phase via self-assembly, which could activate additional energy dissipative mechanisms to enhance the resistance of failure for the epoxy resins. With 5% BPADA-ODA/HAB, the resultant epoxy resins exhibit simultaneous enhancements in impact strength and tensile strength, 184% and 150% higher than those of neat epoxy resin. This study provides an efficient method for preparing tough and strong tetrafunctional epoxy resins, which are expected to be applied more broadly in industries.
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