Custom-shaped malleable, recyclable and reversible structural adhesives based on vanillin polyimine vitrimers

IF 4.5 3区工程技术 Q1 CHEMISTRY, APPLIED

Reactive & Functional Polymers Pub Date : 2024-11-23 DOI:10.1016/j.reactfunctpolym.2024.106109

Anna Vilanova-Pérez , Marc Surós , Àngels Serra , Silvia De la Flor , Adrià Roig

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引用次数: 0

Abstract

A series of polyimine vitrimers were prepared from a synthesized dialdehyde derivative of vanillin. This derivative was then crosslinked with two different ratios of amines (Jeffamine T403 and m-xylylenediamine), forming imine bonds responsible for the exchange reactions. This process resulted in three distinct materials which exhibited glass transition temperatures (T_gs) ranging from 20 to 60 °C, along with good thermal stability, and strong mechanical and thermomechanical properties.

Their dynamicity resulted in a fast relaxation rate achieving a complete relaxation in less than 15 min at 140 °C. Additionally, the polyimines could be mechanically recycled up to three times without significant loss in their final properties, demonstrating the possible enhancement of their lifespan. Moreover, they could be chemically recycled under mild conditions through acid hydrolysis or transamination, which significantly contributes towards a better circular economy. Furthermore, these vitrimers were tested as reversible structural adhesives, achieving initial lap-shear strength values of 12.4 MPa and up to 97 % of efficiency after re-bonding, highlighting their huge potential for industrial applications. Due to their pre-cured state, these adhesives were malleable, which allow them to be custom-shaped into different complex shapes. Finally, these imine materials showed outstanding self-welding capabilities with the repaired versions showing comparable performance to the original.

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.