Study on controlled synthesis and performance of GAP/PBAMO-based energetic thermoplastic elastomers
In order to improve the performance of traditional glycidyl azide polymer(GAP)-based energetic thermoplastic elastomers(ETPE),GAP/PBAMO-based energetic thermoplastic elastomers(GBETPE)with different structural compositions were synthesized using GAP,poly(3,3'-bis-azidomethyloxetane)(PBAMO)as prepolymers by functional group prepolymerization method.The structure of the copolymers was characterized by Fourier transform infrared(FTIR)spectroscopy,nuclear magnetic resonance hydrogen spectroscopy(1H-NMR),gel permeation chromatograph(GPC)and elemental analysis,etc.,which confirmed the controllability of the structure and composition of the copolymer.The number average relative molecular mass((Mn))of GBETPE was 30 243～33 480,the molecular weight distribution(PD)remained at 1.22～1.60,and the nitrogen mass fraction was 37.47％～39.22％.The thermal and mechanical performance of the copolymers were investigated by thermogravimetry(TG),differential scanning calorimeter(DSC)and tensile test,and the relationship between the structure and performance of the copolymers was established.The initial thermal decomposition temperature(T5％)of GBETPE was 219.66～234.88 ℃,the glass transition temperature(Tg)was-37.0 ℃ to-29.7 ℃,and the melting point(Tm)was 60.0～75.5 ℃,showing that it had excellent thermal performance.With HMDI(4,4'-dicyclohexylmethane diisocyanate)and 1,4-butanediol(BDO)as rigid segments,the mass fraction of GAP was 50.98％,and the mass fraction of the rigid segment was 25.5％,the maximum tensile strength(σm)of GBETPE was 4.70MPa,and the elongation at break(εb)was 487.2％,showing that it had good mechanical performance.
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