A thermoreversible crosslinking hot-melt adhesive: reversibility and performance

Wang Xiangjun; Xinzhong Li; Qi Lin; Jianrong Xia; Hanyu Xue

doi:10.1039/d1ra05319a

A thermoreversible crosslinking hot-melt adhesive: reversibility and performance

RSC Adv. 2021 Oct 5;11(52):32565-32572. doi: 10.1039/d1ra05319a. eCollection 2021 Oct 4.

Authors

Wang Xiangjun^{1

2}, Xinzhong Li^{1

2}, Qi Lin^{1

2}, Jianrong Xia^{1

2}, Hanyu Xue^{1

2}

Affiliations

¹ Fujian Engineering and Research Center of New Chinese Lacquer Materials, Ocean College, Minjiang University Fuzhou Fujian 350108 P. R. China jrxia@mju.edu.cn 366157115@qq.com.
² Fujian Provincial University Engineering Research Center of Green Materials and Chemical Engineering, Minjiang University Fuzhou Fujian 350108 P. R. China.

Abstract

The need to improve the environmental friendliness and achieve the recycling of resins is an ongoing process for hot-melt adhesive technology. In this work, a new type of thermoreversible crosslinking hot-melt adhesive-based Diels Alder (DA) reaction was prepared. The critical idea was to efficiently initiate the esterification to yield furoic acid (FA)-grafted poly(vinyl alcohol) (PVA-g-FA), and then PVA-g-FA was mixed with N,N'-(4,4'-methylenediphenyl)dimaleimide (MDI) to finally obtain the thermoreversible crosslinking adhesive (PVA-g-FA/MDI). The experimental results indicated that the reversibility of the DA reaction between the furan rings and the maleimide groups allowed PVA-g-FA/MDI to be dynamically crosslinked. It was able to crosslink at a temperature of 80 °C and decrosslink at 120 °C. Moreover, the performances of hot-melt adhesive were investigated. The PVA-g-FA/MDI had a better peeling strength (43.33 N mm^-1), bond strength (11.84 MPa), and thermal conductivity (0.263 W m^-1 K^-1) than PVA resins. The light-transmittance and haze value were 52.8% and 12.24‰, respectively. The PVA-g-FA/MDI resin could be reused more than two times.