Sugar-Functionalized Polyethylenes with High Adhesion and Triggerable Degradability

Area of Science:

• Polymer Chemistry
• Materials Science
• Sustainable Chemistry

Background:

• Renewable sugar-based monomers offer a sustainable route to high-performance polymers.
• Developing novel monomers is key to unlocking unique polymer properties.

Purpose of the Study:

• To synthesize sugar-functionalized polyethylenes using a novel comonomer.
• To investigate the properties and potential applications of these novel polymers.

Main Methods:

• Catalytic copolymerization of ethylene with a cyclobutene-fused tri-O-benzyl d-glucal (CBG) comonomer.
• Photocatalytic deprotection to remove benzyl groups, yielding free hydroxyl functionalities.
• Characterization of polymer properties, including adhesion and degradability.

Main Results:

• Successfully synthesized polar polyethylenes with tunable CBG content (up to 8.3 mol %).
• Achieved excellent adhesive strength on copper (16.84 MPa) and wood (15.30 MPa) after deprotection.
• Demonstrated the ability to graft polylactic acid (PLA) side chains for use as a compatibilizer for HDPE/PLA blends.
• Showcased mechanoresponsive degradation via cycloreversion of incorporated glucal units, introducing acid-sensitive enol ether linkages.

Conclusions:

• The synthesized sugar-functionalized polyethylenes possess a unique combination of high adhesion and triggerable hydrolytic degradability.
• These materials represent a promising advancement in sustainable polymers with tunable functionalities.
• Potential applications include advanced adhesives and degradable plastics.