Structural Manipulation of Aminal-crosslinked Polybutadiene for Recyclable and Healable Elastomers

Zheng-Hai Tang; Hui Zeng; Si-Qi Wei; Si-Wu Wu; Bao-Chun Guo

doi:10.1007/s10118-021-2626-8

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Structural Manipulation of Aminal-crosslinked Polybutadiene for Recyclable and Healable Elastomers

ARTICLE | Updated：2021-08-04

- Structural Manipulation of Aminal-crosslinked Polybutadiene for Recyclable and Healable Elastomers
- Chinese Journal of Polymer Science Vol. 39, Issue 10, Pages: 1337-1344(2021)
- Affiliations：
  
  1.Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou 510640, China
- Author bio：
  
  mszhtang@scut.edu.cn (Z.H.T)
  psbcguo@scut.edu.cn (B.C.G)
- Funds：
- DOI：10.1007/s10118-021-2626-8
  CLC：
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Zheng-Hai Tang, Hui Zeng, Si-Qi Wei, et al. Structural Manipulation of Aminal-crosslinked Polybutadiene for Recyclable and Healable Elastomers. [J]. Chinese Journal of Polymer Science 39(10):1337-1344(2021)
DOI：

Zheng-Hai Tang, Hui Zeng, Si-Qi Wei, et al. Structural Manipulation of Aminal-crosslinked Polybutadiene for Recyclable and Healable Elastomers. [J]. Chinese Journal of Polymer Science 39(10):1337-1344(2021) DOI： 10.1007/s10118-021-2626-8.

摘要

Abstract

Recently, increasingly growing efforts have been devoted to incorporating dynamic covalent bonds into covalently crosslinked networks to address the persistent trade-offs between chemical crosslinking and malleability. Herein, a series of dynamic aminal bond crosslinked polybutadiene rubbers (PAPB) are prepared by crosslinking aldehyde group-terminated polybutadiene rubber (APB) with piperazine. By varying the molecular weight of APB, the crosslinking density of PAPB is changed, which offers the platform to regulate the mechanical characteristics and dynamic properties. Specially, with the decrease of APB molecular weight,i.e,. with the increase of crosslinking density, the modulus of PAPB gradually increases while the elongation at break conversely decreases, and the activation energy for network rearrangement initially decreases and then increases. The resultant PAPB exhibit vitrimer-like behaviors that can alter the network topologies at elevated temperatures without the loss of structural integrity through dissociative aminal exchange reactions, while the protic source can accelerate aminal dissociation and result in network dissolution even at room temperature. Due to the aminal exchange, PAPB are thermally malleable and can almost restore the original mechanical characteristics after recycling; besides, they are capable of healing at a relatively low crosslinking density.

关键词

Keywords

AminalRecyclabilityHealingStructural manipulationDynamic covalent network

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