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Synthesis and characterization of energetic GAP‐ b ‐PAEMA block copolymer
Author(s) -
Zhang Yang,
Zhao Juan,
Yang Pan,
He Shangjin,
Huang Hengjian
Publication year - 2012
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.22140
Subject(s) - copolymer , materials science , polymer chemistry , atom transfer radical polymerization , thermogravimetric analysis , methacrylate , azide , thermoplastic elastomer , polymer , fourier transform infrared spectroscopy , glass transition , gel permeation chromatography , differential scanning calorimetry , chemical engineering , composite material , chemistry , organic chemistry , physics , engineering , thermodynamics
Abstract Energetic block copolymer of polyglycidylazide‐ b ‐poly (azidoethyl methacrylate) (GAP‐ b ‐PAEMA) was synthesized and characterized. Macroinitiator PECH‐Br prepared via the reaction of 2‐bromoisobutyryl bromide with hydroxyl‐terminated polyepichlorohydrin (PECH‐OH) was used to initiate the atom transfer radical polymerization (ATRP) of chloroethyl methacrylate (CEMA). After azidation of the resulting copolymer, energetic copolymer GAP‐ b ‐PAEMA was obtained. Increase in the molecular weight determined by gel permeation chromatograph (GPC) is in agreement with the formation of block copolymer. Fourier transform infrared spectroscopy (FTIR) shows that the chlorine groups in the block copolymer can be substituted by azide group easily. Thermogravimetric analysis (TGA) shows that degradation of GAP‐ b ‐PAEMA involves two steps: the instantaneous decomposition of the azide groups followed by progressive scission of the polymer backbone. From differential scanning calorimetry (DSC) analysis, the GAP‐ b ‐PAEMA copolymer exhibits two glass transition temperatures ( T g ) at −18 and 36°C, suggesting that the synthesized copolymer is a thermoplastic elastomer. This research provides a new method for the synthesis of energetic polymer. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers