Synthesis and UV-Curing Modification of the High cis-1,4-Hydroxyl-Terminated Polybutadiene Binder Suitable for...

Area of Science:

• Materials Science
• Polymer Chemistry
• Aerospace Engineering

Background:

• Space exploration and polar operations necessitate advanced materials with enhanced low-temperature resistance.
• Propellant binders are critical components requiring superior performance in extreme cold.

Purpose of the Study:

• To synthesize a high cis-1,4 content hydroxyl-terminated polybutadiene (HTPB) with improved low-temperature properties.
• To develop a UV-curable derivative for advanced applications like 3D printed propellants.

Main Methods:

• Oxidative cleavage of cis-polybutadiene (BR) to synthesize cis-HTPB.
• Characterization of microstructure, molecular weight, hydroxyl value, rheology, thermal, and mechanical properties.
• Modification of cis-HTPB with acrylate groups to create a UV-curable binder (AcTPB).

Main Results:

• Successfully synthesized cis-HTPB preserving a high cis-1,4 structure (93%).
• Achieved an ultra-low glass transition temperature (Tg) of approximately -100 °C and reduced viscosity.
• The UV-curable AcTPB also exhibited a Tg near -100 °C, confirming its suitability for ultra-low temperatures.

Conclusions:

• The synthesized cis-HTPB demonstrates excellent low-temperature flexibility and processability, outperforming commercial HTPB.
• The photocurable AcTPB shows significant promise as a binder for 3D printing propellants in extreme cold conditions.