Design and Performance of Rubbers Cross-linked with Dynamic Covalent Bonds

Si-wu Wu; Zheng-hai Tang; Bao-chun Guo

doi:10.11777/j.issn1000-3304.2019.19002

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Design and Performance of Rubbers Cross-linked with Dynamic Covalent Bonds

Feature Articles | 更新时间：2021-01-26

- Design and Performance of Rubbers Cross-linked with Dynamic Covalent Bonds
- Acta Polymerica Sinica Vol. 50, Issue 5, Pages: 442-450(2019)
- 作者机构：
  
  华南理工大学材料科学与工程学院　广州 510640
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2019.19002
  CLC：
- Published：2019-5，
  
  Published Online：11 March 2019，
  
  Received：4 January 2019，
  
  Revised：27 January 2019，
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Si-wu Wu, Zheng-hai Tang, Bao-chun Guo. Design and Performance of Rubbers Cross-linked with Dynamic Covalent Bonds. [J]. Acta Polymerica Sinica 50(5):442-450(2019)
DOI：

Si-wu Wu, Zheng-hai Tang, Bao-chun Guo. Design and Performance of Rubbers Cross-linked with Dynamic Covalent Bonds. [J]. Acta Polymerica Sinica 50(5):442-450(2019) DOI： 10.11777/j.issn1000-3304.2019.19002.

摘要

橡胶具有独特的高弹性，在国民经济和国防等许多领域中有着不可取代的作用. 橡胶的交联是其获得高弹性的前提，只有经过交联的橡胶才具有实用价值. 但通常交联所形成的共价网络具有不可逆特性，导致橡胶制品一旦成型即无法重塑，同时废弃后的橡胶制品回收利用十分困难. 将动态共价键引入橡胶网络，可以将传统热固性橡胶转化为可重复加工的材料，对满足橡胶日益增长的可持续发展需求具有重要意义. 本文首先简述了动态共价键对橡胶材料设计的意义，重点综述了烯烃橡胶网络中动态共价键的引入方法和性能效应，强调了通过界面动态共价键和牺牲键获得兼具可重复加工、高力学性能和功能的橡胶材料设计思路. 最后对动态共价键交联橡胶面临的挑战和发展方向进行了展望.

Abstract

Cross-linked rubbers with unique high elasticity are widely used in our daily lives and high-tech fields. However

irreversible covalent cross-linking makes them virtually impossible to be recycled or even reshaped

and as a consequence

these thermosetting materials tend to end up with stubborn environmental problems. Recently

the exploitation of vitrimers—a novel class of materials—has greatly expanded the realm of dynamic covalent networks. By virtue of the topological network rearrangements based on associative exchange mechanisms

these fancy materials can be thermally reshaped

welded

and reprocessed in the solid state without losing network integrity. Hence

incorporating such elegant dynamic covalent bonds into cross-linked rubber networks can endow these initially thermosetting materials with malleability and reprocessability

which is of exceptional significance to the sustainable development of rubber industry. In addition to recycling

the reinforcement of rubber matrix is equally important in the research field of rubber science and engineering. At present

nano-filling is acknowledged as an effective practice to enhance the mechanical performance of rubber

whereas nano-filler incorporation will inevitably reduce polymer chain mobility

hinder the network rearrangements

and thus impair the recyclability of vitrimers. The simultaneous achievement of reinforcing and recycling is vitally crucial but rarely attained. In this feature article

the significance of dynamic covalent bonds in rubber material design is briefly inctroduced at first

and the progress in design and performance of the covalently cross-linked diene rubbers based on dynamic covalent bonds is reviewed in detail. In particular

extra emphsis has been put on the strategies of integrating sacrificial bonds or interfacial dynamic covalent bonds into the aforementioned rubber vitirmers

which turn out to be practicable countermoves for mechanical reinforcement without sacrificing recyclability. Finally

the challenges and future prospects in this newly emerging field are prospected. It is hoped that this contribution will be of guiding significance to the future development of rubber industry.

关键词

橡胶动态共价键纳米颗粒界面交联增强

Keywords

RubberDynamic covalent bondNanoparticleInterfacial cross-linkingReinforcement

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