Synthesis and Properties of the Novel High-Performance Hydroxyl-Terminated Liquid Fluoroelastomer

Area of Science:

• Materials Science
• Polymer Chemistry

Background:

• Functional liquid fluoroelastomers are crucial for new energy applications, including high-performance sealing and electrode materials.
• Existing fluoroelastomers require improved thermal resistance and curing efficiency for demanding applications.

Purpose of the Study:

• To synthesize a novel hydroxyl-terminated liquid fluoroelastomer (t-HTLF) with high fluorine content, enhanced temperature resistance, and efficient curing.
• To investigate the synthesis mechanism and optimize the reduction process for controllable molar mass and end-group functionality.

Main Methods:

• Synthesized carboxyl-terminated liquid fluoroelastomer (t-CTLF) via oxidative degradation of a VDF-TFE-HFP terpolymer.
• Achieved a one-step reduction of carboxyl groups to hydroxyl groups using lithium aluminum hydride (LiAlH4).
• Characterized the synthesized t-HTLF for properties like thermal decomposition, surface characteristics, and chemical stability.

Main Results:

• Successfully synthesized t-HTLF with controllable molar mass and highly active hydroxyl end groups.
• The cured t-HTLF demonstrated a thermal decomposition temperature (Td) of 334 °C and excellent hydrophobicity.
• The LiAlH4 reduction system also facilitated in situ hydrogenation of residual double bonds, improving thermal stability.

Conclusions:

• The developed t-HTLF offers a promising high-performance material for new energy applications due to its superior thermal and chemical properties.
• The efficient synthesis route provides a method for producing functional fluoroelastomers with tailored properties.
• The study elucidates the reaction mechanisms, enabling further optimization for advanced material development.