Energetic hybrid polymer network (EHPN) through facile sequential polyurethane curation based on the reactivity differences between glycidyl azide polymer and hydroxyl terminated polybutadiene

Tanver, Abbas; Rehman, Fida; Wazir, Aisha; Khalid, Syed; Ma, Shuo; Li, Xiaoyü; Luo, Yunjun; Huang, Mu‐Hua

doi:10.1039/c5ra23250c

Cited by 18 publications

(14 citation statements)

References 49 publications

(52 reference statements)

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“…GAPs with various topological structures have been designed and prepared (branched GAPs, star‐type GAP oligomers, diblock or triblock copolymers of GAPs, grafting compounds of GAPs, etc.) in order to overcome some problems of general linear GAPs in application, such as low molecular weight (2000–5000 g mol −1 ), short polyether main chain, poor low‐temperature properties and so on . In some respects, many of these different GAP‐based polymers exhibit better performances than linear GAPs.…”

Section: Introductionmentioning

confidence: 99%

Core–shell type multi‐arm azide polymers based on hyperbranched copolyether as potential energetic materials in solid propellants

Zhang

et al. 2017

Polymer International

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A series of novel multi-arm azide copolymers (POGs) with the same hyperbranched poly[3-ethyl-3-(hydroxymethyl)oxetane] core (PEHO-c) and different content of linear glycidyl azide polymer shell (GAP-s) have been synthesized by sequential cationic ring-opening polymerization and azidation. Detailed structural information of these copolyethers was deduced from Fourier transform infrared, 1 H NMR and inverse gated decoupled 13 C NMR spectroscopies, matrix-assisted laser desorption ionization time-of-flight mass spectrometry, gel permeation chromatography and elemental analysis. The molecular weight of POG having GAP-s and PEHO-c with a molar ratio 14.95:1 (R s/c ) was around 31 000 g mol −1 , far above that of linear GAP (around 4000 g mol −1 ). The apparent viscosity and glass transition temperature (−51 to −23 ∘ C) decreased first and then slightly increased with increasing molecular weight. Thermal analysis revealed that all the obtained POGs exhibited excellent resistance to thermal decomposition up to 220 ∘ C. Moreover, the energetic properties, investigated using oxygen bomb calorimetric measurements, indicated that the enthalpy of formation of the POGs was higher than that of general linear GAP, but similar to that of branched GAP under reasonable R s/c . The compatibilities of the POGs with common materials used in solid propellants were studied using differential scanning calorimetry and the results indicated that the POGs had good compatibility with these materials.

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Section: Introductionmentioning

confidence: 99%

Core–shell type multi‐arm azide polymers based on hyperbranched copolyether as potential energetic materials in solid propellants

Zhang

et al. 2017

Polymer International

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“…19 The appearance of strong peaks at 1225 and 1161 cm À1 was attributed to -CF 3 , [20][21][22] the appearance of peaks at 1412-1534 cm À1 was attributed to the characteristic absorption of TDI, and the characteristic absorption peaks at 3311, 1710 and 1533 cm À1 certied the formation of urethane linkage. 23,24 Therefore, these results gave strong evidence that the prepolymer process indeed occurred by the formation of PBFMO-b-PNMMO. NMR analysis was used to determine the real composition of the as-synthesized PBFMO-b-PNMMO, which is shown in Fig.…”

Section: Synthesis Of Pbfmo-b-pnmmo-based Thermoplastic Elastomersmentioning

confidence: 60%

Studies on PBFMO-b-PNMMO alternative block thermoplastic elastomers as potential binders for solid propellants

et al. 2019

RSC Adv.

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“…Semsarzadeh and Navarchian reported that during thermal decomposition of EPU, the diisocyanates may be dimerized to form carbodiimides, which can further react with the urethane groups to form a crosslinked structure, which needs more energy to break. The formation of a highly crosslinked network structure in EPU4 is determinant for the observed enhancement in the thermal stability …”

Section: Resultsmentioning

confidence: 99%

Influence of diisocyanate, glycidol and polyol molar ratios on the mechanical and thermal properties of glycidyl-terminated biobased polyurethanes

et al. 2017

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A series of epoxy-terminated polyurethanes (EPUs) were synthesized from castor oil, 4,4 ′ -methylenebis(cyclohexyl isocyanate) (H 12 MDI) and 2,3-epoxy-1-propanol (glycidol) by changing the molar ratio of H 12 MDI to glycidol to polyol. Fourier transform infrared, 1 H NMR and solid-state CP/MAS 13 C NMR spectroscopic analyses revealed the presence of epoxy linkages within the polyurethane backbone. Thermogravimetric analysis showed that EPU4 with a polyol:diisocyanate:glycidol molar ratio of 1:6:6 exhibited an initial decomposition temperature of 128 ∘ C, which was 26 ∘ C higher than that of EPU1 (1:3:3 molar ratio). Differential scanning calorimetry showed an upward shift in the glass transition temperature with increasing molar ratio. Mechanical analysis demonstrated that the tensile modulus of EPU4 was 7.8 times greater than that of EPU1. The crosslinking densities of EPUs were determined using swelling studies which revealed a gradual increase in crosslinking density with increasing epoxy content within the polyurethane. The morphologies of cryo-fractured surfaces of EPUs were determined through scanning electron microscopy to analyse the phase dispersion of epoxy and polyurethane.

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Energetic hybrid polymer network (EHPN) through facile sequential polyurethane curation based on the reactivity differences between glycidyl azide polymer and hydroxyl terminated polybutadiene

Abstract: To improve the thermo-mechanical properties of glycidyl azide polymer and hydroxyl terminated polybutadiene based propellants, a facile sequential polymerization approach was used to prepare an energetic hybrid polymer network by stepwise curation.

Cited by 18 publications

References 49 publications

Core–shell type multi‐arm azide polymers based on hyperbranched copolyether as potential energetic materials in solid propellants

Core–shell type multi‐arm azide polymers based on hyperbranched copolyether as potential energetic materials in solid propellants

Studies on PBFMO-b-PNMMO alternative block thermoplastic elastomers as potential binders for solid propellants

Influence of diisocyanate, glycidol and polyol molar ratios on the mechanical and thermal properties of glycidyl-terminated biobased polyurethanes

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