Reprocessable and Self-healing Polybutadiene Rubber Based on Metal Coordination

doi:10.7503/cjcu20200215

Abstract

Abstract:

To meet the requirements of high mechanical performance in various practical applications, rubber must be chemically cross-linked to form a 3D covalent network. However, the formation of a chemical cross-linked network classifies rubber as a thermoset material, which hinders the reshaping and recycling of rubber, causing waste of resource and severe environmental pollution. To solve this problem, a cross-linked network evolved from metal coordination interaction is introduced to the polybutadiene system to prepare a self-healing rubber material with admirable reprocessing ability. The self-healing rubber materials are fabricated by attaching carboxyl group to polybutadiene, followed by cross-linking through the metal coordination interaction between Zn²⁺ and carboxyl group (the resulting materials are denoted as PB-COOH/Zn²⁺). The PB-COOH/Zn²⁺ exhibits tensile stress of 6.30 MPa, ultimate strain of 2284%, Young’s modulus of 1.68 MPa, and toughness of 68.66 MJ/m³. Benefitting from high mobility of the polymer chain and excellent dynamic performance of the metal coordination interaction, PB-COOH/Zn²⁺ has excellent self-healing and recycling abilities. The mechanical properties of the damaged PB-COOH/Zn²⁺ almost completely recover after healing at 70 ℃ for 3 h. The healing efficiency of PB-COOH/Zn²⁺, which is defined as the ratio of the restored toughness to the original one, is 100%. In addition, PB-COOH/Zn²⁺ can be reprocessed by hot pressing at 70 ℃ with the pressure of 5 MPa for 10 min. The recycled PB-COOH/Zn²⁺ still maintains quite stable mechanical properties after three reprocessing processes. The mechanical properties of the metal coordination elastomer can be further improved by doping PB-COOH/Zn²⁺ with multi wall carbon nanotubs(MWCNTs). The Young’s modulus of the PB-COOH/Zn²⁺ doped with 40%(mass fraction) MWCNTs (denoted as PB-COOH/Zn²⁺/MWCNTs-40) is improved to 8.21 MPa. Doping with MWCNTs doesn’t affect the self-healing and recycling abilities of materials. The conductivity of MWCNTs endows the PB-COOH/Zn²⁺/MWCNTs with potential to transduce electrical energy into Joule heating energy to accomplish electro-thermal healing process and sensing application, which extend its potential applications as environmental-friendly materials.

Key words: Coordination interaction, Polybutadiene, Self-healing, Reprocessing

CLC Number:

O632.12

TrendMD:

GUO Wenjin, WANG Xiaohan, LI Xiang, LI Yang, SUN Junqi. Reprocessable and Self-healing Polybutadiene Rubber Based on Metal Coordination[J]. Chem. J. Chinese Universities, 2020, 41(9): 2090.

Figures/Tables 9

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