A reconfiguring and self-healing thermoset epoxy/chain-extended bismaleimide resin system with thermally dynamic covalent bonds. (4th July 2018)

• Record Type: Journal Article
• Authors: Ding, Zhenjie; Yuan, Li; Guan, Qingbao; Gu, Aijuan; Liang, Guozheng
• Is Part Of: Polymer. Volume 147(2018)
• Page Start: 170
• Page End: 182
• Publication Date: 2018-07-04
• Subjects: Shape memory thermosetting resins -- Reconfiguration -- Self-healing; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2018.06.008
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Muti-functional shape memory materials based on epoxy resins (EP) with different concentration of chain-extended bismaleimide resins (CBMI) were fabricated. The resulting EP/CBMI polymers have high glass transition temperature (Tg : 93–125 °C), excellent thermal stability and good mechanical property. Unlike traditional shape memory polymers (SMPs), EP/CBMI SMPs are capable of shape reconfiguration and self-healing abilities. EP/CBMI polymers have high cycle-life shape memory property at high temperature, and their original shapes can be quickly recovered within 21 s by thermal activation method. Because of dynamic transesterification, EP/CBMI polymers can exhibit plasticity and reconfigure their shapes when heated to the temperature of dynamic transesterification (200 °C). For the same reason, EP/CBMI polymers also exhibit good healing behavior, and a 77.5–86.5% recovery of fracture toughness can be obtained after the fractured EP/CBMI polymers are healed at 200 °C/2 h. Graphical abstract: Image 1 Highlights: Shape memory thermoset epoxy/chain-extended bismaleimide polymers were fabricated. The resulting polymers contain thermally dynamic covalent bonds. The resulting polymers show high cycle-life shape memory effect at high temperature. The rearrangement of chemical networks leads to shape reconfiguration of polymers. The polymers exhibit good healing ability and mechanical and thermal properties.