Synthesis and characterization of PGN- PPG -PGN as a new triblock copolymer

A new energetic triblock copolymer of glycidyl nitrate was synthesis using Polypropylene glycol (PPG) as macro initiator in cationic ring opening polymerization of glycidyl nitrate in the presence of borontrifluoride etherate (BF3-etherate) as catalyst. The synthesized copolymer exhibited the characteristics of an energetic thermo plastic elastomer. The formation of PGN-PPG-PGN tribolck copolymer was verified by IR, 1HNMR and gel permeation chromatography (GPC). Thermal behavior of corresponding polymer was studied by differential scanning calorimetry (DSC). The results showed that PGN-PPG-PGN copolymers has lower glass transition temperature (-56 °C) than PGN (-35 °C). The main weight loss step in the polymer coincides with the exothermic dissociation of the nitrate ester groups in the side chain

Keywords:

Poly Glycidyl nitrate , Poly Tetrahydrofuran , Copolymer , Triblock