A robust and stretchable cross-linked rubber network with recyclable and self-healable capabilities based on dynamic covalent bonds

被引:228
作者
Cao, Liming [1 ]
Fan, Jianfeng [1 ]
Huang, Jiarong [1 ]
Chen, Yukun [1 ]
机构
[1] South China Univ Technol, Sch Mech & Automobile Engn, Lab Adv Elastomer, Guangzhou 510640, Guangdong, Peoples R China
关键词
EPOXIDIZED NATURAL-RUBBER; CELLULOSE NANOCRYSTALS; HIGH-STRENGTH; TUNICATE; LINKING; DESIGN; ACID; NANOCOMPOSITES; NANOFIBRILS;
D O I
10.1039/c8ta11587g
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Adopting robust, stretchable, recyclable and self-healable elastomers composed of renewable resources is of great importance, but is rarely reported due to the irreversible cross-linked network. Here, we propose a simple and efficient method to prepare a robust and stretchable rubber network with recyclable and self-healable capabilities. TEMPO oxidized cellulose nanocrystals (TOCNs) with a large number of carboxyl groups were used as both the reinforcement phase and covalent cross-linkers for epoxidized natural rubber (ENR). FTIR results indicate that interfacial ester bonds were formed between carboxyl groups and epoxy groups. The covalent rubber network exhibited high tensile stress (>5 MPa) and fracture strain (>600%). Additionally, the network with exchangeable -hydroxyl ester bonds at the rubber-TOCN interface can alter the network topology via transesterification reactions at evaluated temperatures. Therefore, the samples can achieve up to approximate to 85% recovery efficiency and approximate to 80% self-healing efficiency, exhibiting excellent reprocessing and self-healing behaviors. In addition, the samples can also be used as substrates for preparing flexible electronic devices, which exhibited excellent self-healing of electrical conductivity after damage.
引用
收藏
页码:4922 / 4933
页数:12
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