Thermal-driven self-healing and green recyclable waterborne polyurethane films based on double reversible covalent bonds

被引：35

作者：

Sai, Futao ^{[1
]}

Zhang, Haitao ^{[1
]}

Qu, Jianbo ^{[1
]}

Wang, Jianyong ^{[1
]}

Zhu, Xiuzhong ^{[1
]}

Ye, Peng ^{[1
]}

Zhang, Zhiliang ^{[1
]}

机构：

[1] Qilu Univ Technol, Shandong Acad Sci, State Key Lab Biobased Mat & Green Papermaking, Jinan 250353, Peoples R China

来源：

PROGRESS IN ORGANIC COATINGS | 2023年 / 178卷

基金：

中国国家自然科学基金;

关键词：

Waterborne polyurethane (WPU); Self-healing; Green recycling; Oxime-carbamate bond; Diels-Alder (DA) bond; HYDROGEN; BEHAVIOR;

D O I：

10.1016/j.porgcoat.2023.107460

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Recently, the self-healing and recyclability of waterborne polyurethane (WPU) has attracted significant research attention. Herein, different weight ratios of Diels-Alder (DA) diol and diacetyl oxime (DMG) were used as the reactive monomer with polytetramethylene ether glycol (PTMG), isophorone diisocyanate (IPDI) and dimethy-lolpropionic acid (DMPA). A series of thermal-driven self-healing and green recyclable waterborne polyurethane films (WPU-DMGx-DAy) were prepared based on synergistic dynamic reactions of oxime-carbamate and DA bonds. We investigated the properties of WPU-DMGx-DAy emulsions by particle size and zeta potential tests, and the results show that these emulsions have excellent storage stability. The self-healing properties of WPU-DMGx- DAy films were identified by dynamic mechanical analysis. It was revealed that the WPU-DMG4-DA4 film has the best self-healing capability, and the self-healing efficiency can reach 92. +/- 0.1 % after self-healing at 120 degrees C for 4 h. The mechanism of the self-healing behavior was studied by Fourier transform infrared spectroscopy, and the effective reversibility of the oxime-carbamate and DA bonds were verified. In addition, thermal gravimetric analysis and tensile test results showed that the thermal stability and mechanical properties of the WPU-DMGx- DAy films were significantly improved. More importantly, the WPU-DMG4-DA4 film can be dissolved in a mixed acetone/ethanol solvent at room temperature. The recycled polyurethane solution could be dispersed in water to obtain a WPU emulsion again. After being recycled three times, the recovery efficiency of the mechanical properties of the WPU-DMG4-DA4 film was higher than 90.1 +/- 0.1 %, and the recycled film maintained its thermal stability and self-healing behavior. Moreover, the synthetic leather obtained by compounding WPU-DMG4-DA4 and non-woven fabrics could be easily recycled through this process. The basic properties of the recycled non-woven fabric remained unchanged and the recycled WPU-DMG4-DA4 resin could be reused. Therefore, the WPU-DMG4-DA4 resin has broad application prospects in the tanning industry.

引用

页数：14

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