An Acid-/Base-Degradable Epoxy Resin Cured by 1,3,5-Triacroylamino-hexahydro-s-triazine Derivative

Lei Wang; Shijing Yan; Lei Zhang; Yuliang Mai; Weihao Li; Hao Pang

Macromolecular Research, Vol.29, No.7, 462-469, July, 2021

DOI10.1007/s13233-021-9060-1 Export Citation

An Acid-/Base-Degradable Epoxy Resin Cured by 1,3,5-Triacroylamino-hexahydro-s-triazine Derivative

Lei Wang¹, Shijing Yan^{1, 2, †}, Lei Zhang^{1, †}, Yuliang Mai¹, Weihao Li¹, and Hao Pang¹

¹Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou, Duangdong, 510665, P. R. China
²Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, Guangxi, 530008, P. R. China

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The degradation and recycling of waste epoxy resin products is an urgent environmental problem. To solve this issue, we use acid-/base-degradable 1,1’,1"- (1,3,5-hexahydro-s-triazine-1,3,5-triyl) tris(3-ethylamino-propan-1-one) (TAHT-EA) as curing agent to introduce the hexahydro-s-triazine (HT) ring structure into the cross-linking network to prepare degradable epoxy resin. Specifically, 1,3,5 triacryloylhexahydro-1,3,5-triazine (TAHT) and ethylamine quickly complete the Aza-Michael addition reaction at the interface of chloroform and water droplets under the catalysis of water. The FTIR spectra, NMR spectrum and mass spectrum show that mono- and bis-addition products of ethylamine coexist in the product in which the content of the primary addition product reaches 97%. TAHT-EA can be decomposed by acid and base solutions. Through NMR analysis of the degradation products, it can be explained that the degradation mechanisms are different. The breaking of amide bonds and HT rings in acid solution and the cracking of amide bonds in base solution are speculated to be the main mechanisms under these two different circumstances, respectively. We tested the mechanical, thermal and degradation properties of the epoxy resin cured by TAHT-EA, and compared it with the epoxy resin cured by 4,4'-diaminodiphenylmethane and triethylenetetramine. TAHT-EA-cured epoxy resin shows comparable mechanical properties with Young’s modulus up to 2.05 GPa and tensile strength up to 70.9 MPa. What is more, it degrades completely by 1 M H+/OH- solution at 60℃ within 36 h. Nevertheless, it exhibited a relatively low crosslinked density (633 mol/m3) and low heat resistance (the initial decomposition temperature is lower than 205℃). Overall, TAHT-EA cured epoxy resin has the potential to gradually replace traditional thermosetting resin, thereby solving the environmental problems caused by discarded epoxy resin products.

Keywords:degradable epoxy resin;hexahydro-s-triazine derivative;degradation property;degradation mechanism

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[19] Mao Z, Li Z, Hu C, Liu Y, Cao Z, Chen Z, J. Chromatogr. A, 1621, 461031 (2020)

[20] Kong LZ, Pan CY, Polymer, 49(16), 3450 (2008)

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[22] Lewis DM, Ho YC, Dyes Pigment., 28, 171 (1995)

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[24] Huang ZB, Kang TJ, Chang SH, New J. Chem., 29, 1616 (2005)

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