Rheological studies on energetic thermoplastic elastomers

Abstract

Energetic thermoplastic elastomers containing energetic groups, such as azido, nitrato, nitro, and so forth, are emerging as attractive binder systems for advanced solid rocket propellants. Poly[3,3-bis(Azidomethyl) oxetane (BAMO)-co-3-azidomethyl-3-methyl oxetane (AMMO)] comprising hard crystalline BAMO segment and the soft/amorphous AMMO segment in various molar ratios (80 : 20, 50 : 50 and 20 : 80) were synthesized during the present work. The homo polymers namely Poly-BAMO and Poly-AMMO were also synthesized. All the polymers and copolymers were characterized by spectral and thermal methods. They were found to be thermally stable. The most promising 80 : 20 copolymer softened at 56 C with T g of À36 C. Rheological studies were also carried out to determine their suitability as a binder in explosive and propellant formulations.

Characterization of P(BAMO/AMMO) ETPE Prepared Using Different Diisocyanates

“…Energetic thermoplastic elastomers (ETPEs) have attracted much attention in the field of propellant recently for their high energetic performances, excellentm echanicalp roperties, and good processing properties amongst others [1][2][3]. As one of the most valuable ETPEs, poly(3,3-bisazidomethyl oxetane/3-azidomethyl-3-methyl oxetane) [P(BAMO/ AMMO)] has been in research focus in recenty ears [4][5][6][7][8].I t is the preferred ETPE for next-generation energetic binder [2].…”

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1IntroductionEnergetic thermoplastic elastomers (ETPEs) have attracted much attention in the field of propellant recently for their high energetic performances, excellentm echanicalp roperties, and good processing properties amongst others [1][2][3]. As one of the most valuable ETPEs, poly(3,3-bisazidomethyl oxetane/3-azidomethyl-3-methyl oxetane) [P(BAMO/ AMMO)] has been in research focus in recenty ears [4][5][6][7][8].I t is the preferred ETPE for next-generation energetic binder [2].Twom ethods have been proposedt op repare P(BAMO/ AMMO) ETPEs, including living polymerization (see Scheme 1) to form and obtain BAMO-AMMO-BAMOt riblock copolymer and linking of two polymer blocks.Z hang et al preparedt he BAMO-AMMO-BAMO triblock copolymer through cationic ring-opening polymerization (CROP) [9][10][11]. The other method is consistent with the polyurethane syntheticp rocess (see Scheme 2).

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Carbon nanotubes from renewable feedstocks: A move toward sustainable nanofabrication

“…139 The common disposal mechanism of poultry feathers is in landfills and the chemical resistive properties of keratin due to its a-helix and b-sheet structural packaging makes their biodegradation very slow; creating environmental concerns. 140,141 Recently, efforts have been made to create applications for chicken feathers in biobased materials such as polymer composites [142][143][144] and pyrolyzed products for hydrogen adsorption/catalytic applications. 145,146 Senoz et al 147 have reported the effective fabrication of carbon fibers from the pyrolysis of chicken feathers.…”

Functionalization of cis‐1,4‐polyisoprene using hypervalent iodine compounds with tetrazole ligands

“…Thereafter, many other energetic polymers came into light, which contained thermally labile functional groups, such as azide, nitro, and difluoroamine . Examples of such energetic polymers are poly(glycidyl azide), poly(glycidyl nitrate), poly(3‐nitratomethyl‐3‐methyloxetane), and poly(3‐difluoroaminomethyl‐3‐methyloxetane) . In addition to the mentioned labile functionalities, tetrazoles are also popular since they decompose easily with the release of large amounts of nontoxic gases, i.e ., nitrogen, the weight content of which in the parent heterocycle is 79%.…”