Premium
Copolymers based on GAP and 1,2‐Epoxyhexane as Promising Prepolymers for Energetic Binder Systems
Author(s) -
Hafner Sven,
Keicher Thomas,
Klapötke Thomas M.
Publication year - 2018
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.201700198
Subject(s) - copolymer , cationic polymerization , polymer chemistry , glass transition , plasticizer , epichlorohydrin , polymer , materials science , polymerization , ring opening polymerization , composite material
Copolymers of epichlorohydrin (ECH) and 1,2‐epoxyhexane (EpH) have been synthesized via cationic ring‐opening polymerization using BF 3 ×THF as a catalyst. Structures of the resulting polymers have been confirmed by IR and NMR spectroscopy and GPC. In a subsequent reaction with NaN 3 in DMSO, the halogenated precursors were completely azidated, which was confirmed by the same spectroscopic methods. The introduced pendant n ‐butyl chains act as an internal plasticizer by lowering the glass transition temperature (T g ) of the copolymers compared to the reference compound glycidyl azide polymer (GAP). Compared to GAP in a similar molecular weight range, the copolymers also showed reduced viscosity. These properties make the described copolymers interesting candidates for use as energetic binders in cast‐cure applications.