Citation: Dong Wang, Li-ying Li, Hong-jun Ke, Kong-li Xu, Shan Lu, Wen-hua Gong, Huan Zhang, Guo-yong Wang, Ying-min Zhao, Ning Zhao. Preparation and Properties of Recyclable High-performance Epoxy Resins and Composites[J]. Acta Polymerica Sinica, ;2020, 51(3): 303-310. doi: 10.11777/j.issn1000-3304.2019.19167 shu

Preparation and Properties of Recyclable High-performance Epoxy Resins and Composites

Dong Wang ^1,, ,
Li-ying Li ¹ ,
Hong-jun Ke ¹ ,
Kong-li Xu ¹ ,
Shan Lu ¹ ,
Wen-hua Gong ¹ ,
Huan Zhang ² ,
Guo-yong Wang ^1,, ,
Ying-min Zhao ¹ ,
Ning Zhao ²

1.
Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074
2.
Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190

Corresponding author: Dong Wang, wangdong@iccas.ac.cn Guo-yong Wang, sock129@163.com
Received Date: 10 September 2019
Revised Date: 19 October 2019

Aiming at the demands for recyclable resins and composites in practical applications, high performance recyclable epoxy resins with excellent comprehensive properties are prepared using methyl teterahydrophthalic anhydride as the curing agent and zinc acetylacetonate hydrate as the catalyst. The effects of anhydride and catalyst concentrations on the structure, thermal and dynamic properties of epoxy vitrimers are systematically explored to achieve the resin formulation optimization. With the decrease of anhydride concentrations, the cross-linking densities decrease, and the epoxy vitrimers show decreased glass transition temperature (T_g) but enhanced dynamic properties, which is attributed to the sufficient hydroxyl groups in structure that could trigger the transesterification exchange reactions with ester bonds. The increase of catalyst concentrations can also lead to enhanced dynamic properties as a result of the accelerated transesterification rates. The epoxy vitrimer with epoxy/anhydride/catalyst ratios of 1:0.5:0.05 displays optimal comprehensive performance with intermediate thermal properties and excellent dynamic properties. Based on the dynamic transesterification reaction, the epoxy vitrimers can be well reprocessed by the physically hot pressing methods at 180 °C for 6 h under a pressure of 10 MPa, and the recycling efficiency can be up to 80%. Moreover, the epoxy vitrimer-based carbon fiber reinforced composites are prepared by the resin transfer molding (RTM) technique. The prepared carbon fabric composites show a tensile strength of 479 MPa and tensile modulus of 58 GPa, revealing comparable mechanical properties to those of traditional thermoset composites. After heating the composites in ethylene glycol solvent at 180 °C for 8 h, the clean carbon fiber fabric with the same dimension as fresh ones can be reclaimed due to the dissolution of epoxy vitrimer binder in alcohol solvent via transesterification. In addition, the collected dissolved polymers can form vitrimers again by evaporating the EG solvent in open air at 180 °C for 12 h. It is demonstrated that the carbon fibers and epoxy polymers can both be fully recycled from the composites by the alcohol solvent dissolution method.
- Epoxy resins,
- Composites,
- Recyclable,
- Transesterification reaction
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