Preparation and Properties of PU-DA System Based on Thermoreversible Diels-Alder Dynamic Covalent Bond

doi:10.11901/1005.3093.2020.535

Chinese Journal of Materials Research

2021, Vol. 35

Issue (10): 752-760 DOI: 10.11901/1005.3093.2020.535

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Preparation and Properties of PU-DA System Based on Thermoreversible Diels-Alder Dynamic Covalent Bond

WAN Liying(

), XIAO Yang, ZHANG Lunliang

School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China

Cite this article:

WAN Liying, XIAO Yang, ZHANG Lunliang. Preparation and Properties of PU-DA System Based on Thermoreversible Diels-Alder Dynamic Covalent Bond. Chinese Journal of Materials Research, 2021, 35(10): 752-760.

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Abstract

The highly flexible polytetrahydrofuranediol (PTMG) substrate was reacted with furfuryl glycidyl ether-2-furanethylamine (FGE-FA) to obtain the polyurethane prepolymer of tetrahydrofuran structure, and then it was reacted with bismaleimide of dienophile structure to prepare high density Diels-Alder (DA) self-healing polyurethane (PU-DA) with dynamic covalent bond. The PU-DA was characterized by FTIR, DSC and OM, and the performance of PU-DA was tested by electronic universal testing machine. The results show that the forward and reverse reaction temperatures of PU-DA are 70℃ and 132℃, respectively, after the introduction of DA dynamic covalent bond. PU-DA has good performance in remodeling, swelling solubility and multiple self-healing. Cracks of the damaged PU-DA could basically be healed by heating at 70℃ for 4 h, meanwhile, the first repair rate could 94.8%, and the third repair rate was still higher than 70%.

Key words: organic polymer materials self-healing Diels-Alder reaction polyurethane thermal reversibility

Received: 17 December 2020

ZTFLH:

TQ323

Fund: National Natural Science Foundation of China(51463016);Shanghai Aerospace Science and Technology Innovation Fund(SAST2016053)

About author: WAN Liying, Tel: 13687084426, E-mail: wlygood@nchu.edu.cn

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	Liying WAN
	Yang XIAO
	Lunliang ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.535 OR https://www.cjmr.org/EN/Y2021/V35/I10/752

Fig.1 Synthetic routes of PU-DA

Fig.2 FTIR curves of FGE (a), FGE-FA (b), IPDI-PTMG (c) and Pre-PU (d)

Fig.3 ATR-FTIR curves of PU-DA

Fig.4 DSC curves of 1,8-BMI (a) and PU-DA (b)

Fig.5 TGA curves of 1,8-BM and PU-DA

Table 1 Effect of repair time on mechanical properties of PU-DA

Fig.6 Change of mechanical properties of PU-DA repaired at 70℃ for different time

Fig.7 Swelling and dissolution experiment of PU-DA

Tab.2 Swelling and solubility of PU-DA sample at different temperatures

Fig.8 PU-DA_{sample self-healing micrograph (a) before repairing, (b) after repairing}

Fig.9 Mechanism diagram of PU-DA repair process based on thermoreversible DA dynamic covalent bonds

Fig.10 PU-DA multiple self-healing properties

Fig.11 Stress-strain curves of PU-DA repaired for different repair times

Table 3 Tensile test and repair rates under multiple self-healing of samples

Fig.12 PU-DA reprocessing performance

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