ENGINEERING TECHNOLOGY

The study found a new degradable high temperature and low temperature resistant adhesive


Preparation and application of adhesives that can withstand both high temperature and low temperature. Photo courtesy of Chinese Academy of Agricultural Sciences

Polylipoic acid 3D printing new material. Photo courtesy of Chinese Academy of Agricultural Sciences

Recently, the development and utilization team of degradable materials of the Institute of Hemp of the Chinese Academy of Agricultural Sciences has made important progress in the development and utilization of environmentally friendly degradable adhesives together with Hunan University and Central South University. They used supramolecular polymerization to prepare a series of adhesive materials with good adhesion properties and a wide range of use from small molecules, and used their viscous effect as 3D printing materials. These supramolecular polymer-based degradable adhesive materials not only have a higher adhesion effect than similar materials, but also provide a new idea in application. Relevant research results were published online in the Journal of Chemical Engineering and Advanced Science, and were authorized by national invention patents.

Adhesives are widely used in daily life, medical and health, automobile industry, aerospace and other fields, and with the improvement of environmental awareness, the development of environmentally friendly biodegradable adhesive materials has become an important research topic. Existing adhesives have poor adhesion, especially in extreme environments. What’s more, these adhesive materials cannot be additive manufacturing to make them more widely used.

Using the strategy of molecular recognition and supramolecular polymerization, the researchers synthesized a series of adhesives with simultaneous high and low temperature resistance, which reached 5.18 MPa at a high temperature of 150 °C and 9.52 MPa at a low temperature of –196 °C. Real-time and quantitative monitoring of adhesion behavior over a wide temperature range (−80−150 °C) is successfully achieved, and adhesion duration, attenuation and failure can be easily monitored using customized equipment. This work prepared a series of adhesion materials that can resist high and low temperatures at the same time and have good adhesion effect, and also provides new ideas for the monitoring of adhesion effect.

In view of the lack of further additive use of previous adhesive materials, researchers further used the thermal response ring-opening polymerization of natural small molecule lipoic acid to form polylipoic acid, and prepared a new adhesive. Based on the time-dependent self-reinforcing effect of this adhesive, it is used in additive manufacturing hot melt deposition 3D printing.

Through the 3D printing of polylipoic acid, the model formation on different scales is completely realized. After 3D printing, the polylipoic acid printed model exhibits mechanically enhanced features over time. This is caused by the microscopic self-assembly of polylipoic acid and lipoic acid.

This work realizes the organic combination of self-assembly at the micro level and self-assembly at the macro level. This research also provides a feasible method for controllable fabrication and mechanical enhancement of adhesive materials, opening the way for the application of next-generation functional adhesive materials. (Source: Li Chen, China Science Daily)

Related Paper Information:

https://doi.org/10.1016/j.cej.2022.138674

https://doi.org/10.1002/advs.202203630

Authorized invention patent: preparation method of adhesive that can resist high temperature and low temperature at the same time ZL202011312658.8



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