Volume 136, Issue 38 e202408840
Forschungsartikel

Asynchronous Ring Opening of Cyclic Carbonate and Glycidyl Ether Induced Phase Evolution Towards Heat-Free and Rapid-Bonding Superior Epoxy Adhesive

Peixin Niu

Peixin Niu

College of Chemistry and Pingyuan Laboratory, Zhengzhou Key Laboratory of Elastic Sealing Materials, Zhengzhou University, Zhengzhou, 450001 China

These authors contributed equal to this work.

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Chuanlong Li

Chuanlong Li

College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials and Engineering, Sichuan University, Chengdu, 610065 China

These authors contributed equal to this work.

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Jun Zhu

Jun Zhu

School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001 China

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Yifang Zhao

Yifang Zhao

College of Chemistry and Pingyuan Laboratory, Zhengzhou Key Laboratory of Elastic Sealing Materials, Zhengzhou University, Zhengzhou, 450001 China

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Zixian Li

Zixian Li

College of Chemistry and Pingyuan Laboratory, Zhengzhou Key Laboratory of Elastic Sealing Materials, Zhengzhou University, Zhengzhou, 450001 China

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Ailing Sun

Ailing Sun

College of Chemistry and Pingyuan Laboratory, Zhengzhou Key Laboratory of Elastic Sealing Materials, Zhengzhou University, Zhengzhou, 450001 China

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Prof. Liuhe Wei

Prof. Liuhe Wei

College of Chemistry and Pingyuan Laboratory, Zhengzhou Key Laboratory of Elastic Sealing Materials, Zhengzhou University, Zhengzhou, 450001 China

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Dr. Kai Wu

Corresponding Author

Dr. Kai Wu

College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials and Engineering, Sichuan University, Chengdu, 610065 China

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Dr. Yuhan Li

Corresponding Author

Dr. Yuhan Li

College of Chemistry and Pingyuan Laboratory, Zhengzhou Key Laboratory of Elastic Sealing Materials, Zhengzhou University, Zhengzhou, 450001 China

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First published: 26 June 2024

Abstract

Structural adhesives that do not require heating are in high demand in the automotive and electronics industries. However, it remains a challenge to develop robust adhesives that rapidly achieve super adhesion near ambient temperature. Herein, a room-temperature curable, fast-bonding, and super strong epoxy-based structural adhesive was designed from the perspective of cross-scale structure, which lies in threefold pivotal aspects: (i) high branching topology of glycerol carbonate-capped polyurethane (PUGC) increases the kinetics of the ring-opening reaction, contributing to fast crosslinking and the formation of abundant urethane and hydroxyl moieties; (ii) asynchronous crosslinking of epoxy and PUGC synergistically induces phase separation of PUGC within the epoxy resin and the resulting PUGC domains surrounded by interpenetrated shell serves to efficiently toughen the matrix; (iii) abundant dynamic hydrogen bonds including urethane and hydroxyl moieties, along with the elastomeric PUGC domains, dissipate energy of shearing force. As a result, the adhesive strength rapidly grows to 16 MPa within 4 hours, leveling off to 21 MPa after 7 hours, substantially outperforming commercial room-temperature curable epoxy adhesives. The results of this study could advance the field of high-performance adhesives and provide valuable insights into designing materials for efficient curing at room temperature.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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