GAP基含能热塑性弹性体的合成与表征

Synthesis and Characterization of GAP-based Energetic Thermoplastic Elastomer

以聚叠氮缩水甘油醚(GAP)为软段,1,4-丁二醇(BDO)和4,4′-二苯基甲烷二异氰酸酯(MDI)为硬段,采用熔融预聚体法合成了GAP基含能热塑性弹性体(ETPE)。研究了扩链剂加料方式、催化剂用量、异氰酸酯指数、硬段含量等因素对弹性体力学性能的影响。采用傅里叶变换红外光谱(FT-IR)、凝胶渗透色谱(GPC)、热台显微镜、差示扫描量热(DSC)、热重分析(TG)表征了ETPE的性能。结果表明,采用恒速滴加扩链剂方法合成的ETPE具有良好的热稳定性和力学性能。当催化剂质量分数为0.6‰,异氰酸酯指数(R)为0.98,硬段质量分数(Y)为35%时,热塑性弹性体的数均相对分子质量为52 312,软化点为96℃,拉伸强度为14.52MPa,断裂伸长率为518.78%。

A GAP based energetic thermoplastic elastomer （ETPE） was synthesized through a melt-prepolymeriza- tion method using glycidyl azide polymer （GAP） as soft segments, 1, 4-butanediol （BDO） and 4, 4＇-diphenylmeth- ane diisoeyanate （MDI） as hard segments. The effect of feeding method of chain extender, catalyst dosage, isocyanate index and hard segment content, etc. factors on the mechanical properties of elastomer was studied. The properties of synthesized ETPE was characterized chromatography （GPC）, hot stage microscopy, mechanical properties test. The results show by Fourier differential transform infrared （FT-IR） spectrometry, gel calometry （DSC）, thermogravimetry permeation （TG） and that the ETPE synthesized by the method of dropping the chain extender in constant speed has better thermal stability and better mechanical properties. For the ETPE, the number- average relative molecular mass is 52 312, the softening point 96℃, the tensile strength （8） 14. 52 MPa and the elongation at break （ε） 518.78% when the mass fraction of catalyst is 0.6‰, the isocyanate index （R） 0.98 and the mass fraction of hard segment （Y） 35%.