Citation: Wei-dong Li, Gang Liu, Jin-dong Zhang, Lian-wang Zhang, Jian-wen Bao, Yan Zhao. Benzoxazine Modified Epoxy Resin for Liquid Composite Molding[J]. Acta Polymerica Sinica, ;2016, (4): 520-527. doi: 10.11777/j.issn1000-3304.2016.15219 shu

Benzoxazine Modified Epoxy Resin for Liquid Composite Molding

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Key Laboratory of Advanced Composites, Beijing Institute of Aeronautical Materials, AVIC Composites Center, Beijing 100095
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1. Key Laboratory of Advanced Composites, Beijing Institute of Aeronautical Materials, AVIC Composites Center, Beijing 100095
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2. School of Materials Science and Engineering, Beihang University, Beijing 100191
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School of Materials Science and Engineering, Beihang University, Beijing 100191

Corresponding author: Gang Liu,
Received Date: 16 September 2015
Revised Date: 5 November 2015

Benzoxazine(BOZ) with low curing shrinkage was used to modify epoxy in liquid composite molding(LCM) process.The purpose was to reduce curing shrinkage of epoxy greatly, while the heat resistance, manufacturability and mechanical property did not decrease.The curing shrinkage property, curing reactivity, LCM manufacturability and mechanical properties of modified resins with different contents of BOZ were studied.Then the composites reinforced by unidirectional carbon fiber fabric were prepared by vacuum assisted resin infusion(VARI) process, and the mechanical properties of the composites were studied.The results show that the addition of BOZ basically has no influence on the curing reactivity, LCM manufacturability and heat resistance of epoxy.The curing shrinkage of modified resin decreases with the increasing of the BOZ content, andthe curing shrinkage of modified resin with 15 wt% BOZ decreases by about 79%, compared to the unmodified resin.Simultaneously, the tensile strength of the modified resin increases by about 19%, as well as the impact strength increases by about 148%.Moreover, the tensile strength and the interlaminar shear strength(ILSS) of the modified resin based composite improve by about 23% and 9% respectively, relative to the unmodified resin based composite.Namely, the mechanical properties and the interface bonding properties of the modified resin based composite are superior.
- LCM,
- Epoxy,
- Benzoxazine,
- Curing shrinkage,
- Composites
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