| 초록 |
Since early 1980s, hydroxyl-terminated poly(glycidyl azide, GAP) obtained by azidation of poly(epichlorohydrin) has been of great interest for its positive effect on specific impulse and on burning rate of solid composite rocket propellants by the presence of azide groups(-N3) in polymer chain. However, it has been recognized that GAP-based propellants don’t exhibit excellent mechanical properties and especially good low temperature properties caused by poor polymer backbone flexibility of GAP possessing the methylene azide side groups and lower plasticization of GAP with nitrate ester plasticizers. In this study, in order to enhance the mechanical properties of GAP-based elastomer, we prepared the copolyurethane of GAP and PEG (polyethylene glycol), which consists of very flexible backbone and can be highly plasticized, cured with various ratio of IPDI and N-100 systems. All copolyurethanes prepared were characterized in regard to their mechanical, swelling and thermal properties. |
