PBT弹性体微相分离及对其力学性能的影响研究
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摘要
为了获得微相分离对宽温PBT叠氮聚醚弹性体力学性能的影响规律,用红外光谱分析法(FT-IR)和动态热力学分析法(DMA)研究了PBT叠氮聚醚弹性体产生微相分离的机理和影响因素。用调节硬段含量、交联参数的方法调控其微相分离,控制适当的微相分离程度可显著改善推进剂的力学性能。研究结果表明:在二元醇扩链的弹性体体系中,当硬段含量约为15%时,弹性体发生相对最大比例的微相分离,体现出较佳的综合力学性能。通过微相分离的调控可获得宽温范围内综合力学性能较好的叠氮聚醚推进剂用粘合剂基体材料。
In order to obtain the effects of microphase separation on mechanical properties of PBT elastomers,the microphase separation mechanism and influence factors of PBT(3,3-bis(azidomethyl)oxetane and tetrahydrofuran(BAMO-THF)copolymers)are studied by Fourier transform infrared spectroscopy(FT-IR)and dynamic mechanical analysis(DMA).The results suggest that the degree of the microphase separation can be adjusted with hard segment structure and crosslinking agent content.There is the greatest scale of microphase separation in the PBT elastomer with hard segment content of 15%,which shows good mechanical properties.The mechanical properties of PBT propellant matrix can be optimized by designing microphase separation.
In order to obtain the effects of microphase separation on mechanical properties of PBT elastomers,the microphase separation mechanism and influence factors of PBT(3,3-bis(azidomethyl)oxetane and tetrahydrofuran(BAMO-THF)copolymers)are studied by Fourier transform infrared spectroscopy(FT-IR)and dynamic mechanical analysis(DMA).The results suggest that the degree of the microphase separation can be adjusted with hard segment structure and crosslinking agent content.There is the greatest scale of microphase separation in the PBT elastomer with hard segment content of 15%,which shows good mechanical properties.The mechanical properties of PBT propellant matrix can be optimized by designing microphase separation.
引文
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[2]赵孝彬,杜磊,张小平.聚氨酯的结构与微相分离[J].聚氨酯工业,2001,16(1):4-8.
[3]刘振,郭敏杰,肖长发.聚醚氨酯结构与微相分离的研究[J].聚氨酯工业,2005,19(8):27-31.
[4]PANGON A,DILLON G P,RUNT J.Influence of mixed soft segments on microphase separation of polyurea elastomers[J].Polymer,2014,55(7):1837-1844.
[5]JIANG L,WU J,NEDOLISA C,et al.Phase separation and crystallization in high hard block content polyurethane thin films[J].Macromolecules,2015,48(15):5358-5366.
[6]HE Y,ZHANG X,RUNT J.The role of diisocyanate structure on microphase separation of solution polymerized polyureas[J].Polymer,2014,55(3):906-913.
[7]JIAN X X,HU Y W,ZHENG Q L.Effect of thermal processing temperature on the microphase separation and mechanical properties of BAMO/THF polyurethane[J].Journal of polymer engineering,2016,37(2):169-176.
[8]SAMI S,YILDIRIM E,YURTSEVER M,et al.Understanding the influence of hydrogen bonding and diisocyanate symmetry on the morphology and properties of segmented polyurethanes and polyureas:Computational and experimental study[J].Polymer,2014,55(18):4563-4576.
[9]PONGKITWITOON S,HERNNDEZ R,WEKSLER J,et al.Temperature dependent microphase mixing of model polyurethanes with different intersegment compatibilities[J].Polymer,2009,50(26):6305-6311.
[10]苗毅,史铁钧,杭国培,等.硬段含量对聚氨酯和聚氨酯脲氢键化程度的影响[J].化学推进剂与高分子材料,2008,6(2):40-44.