Study on Synthesis and Properties of Novel HTPB/PEG Polyurethane Copolymers
Two novel polyurethanes (PU) with alternating and random block architectures, hydroxyl-terminated polybutadiene (HTPB)/polyethylene glycol (PEG) block copolymers, HTPB-alt-PEG and HTPB-co-PEG, were synthesized via a coupling reaction route between hydroxyl groups and isocyanate groups. The structural and crystal characterization was conducted by means of FTIR, and phase behavior was examined by SEM and DSC. The biodegradation in a simulated human body fluid was investigated through mass loss and SEM. The experimental results indicate that all polyurethane samples form the microphase separation structure, and the separation degree depended on their sequence structure and the molecular weight (MW) of PEG, and further affecte their in-vitro degradation.
Y. L. Luo et al., "Study on Synthesis and Properties of Novel HTPB/PEG Polyurethane Copolymers", Applied Mechanics and Materials, Vols. 66-68, pp. 170-173, 2011