GAP/MDI/DEG含能热塑性弹性体的合成与性能  

Synthesis and Properties of GAP/MDI/DEG Energetic Thermoplastic Elastomer

作　　者：左海丽[1] 肖乐勤[1] 菅晓霞[1] 周伟良[1] 徐复铭[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210094

出　　处：《高分子材料科学与工程》2010年第12期20-23,共4页Polymer Materials Science & Engineering

摘　　要：以一缩二乙二醇(DEG)为扩链剂采用熔融预聚二步法合成了一种聚叠氮缩水甘油醚(GAP)基含能热塑性聚氨酯弹性体(GAP/MDI/DEG-ETPE)。采用凝胶渗透色谱(GPC)、红外光谱(FT-IR)、动态热机械分析(DMA)、X射线衍射(XRD)分析和力学性能测试技术对合成的ETPE进行了性能表征。结果表明,当-NCO/-OH摩尔比(R值)为0.98,后熟化条件为30℃1d,90℃3d,硬段质量分数为35%时,ETPE的数均相对分子质量为84530,重均相对分子质量为202400,分散指数为2.39,且具有较佳的力学性能和动态力学性能,其拉伸强度为14.6MPa,断裂伸长率为414%,玻璃化温度为-29.6℃。An energetic thermoplastic elastomer GAP/MDI/DEG-ETPE （ETPE） was synthesized through melt-prepolymerization method using ethylene glycol（DEG） as chain extender for the purpose of using as high energy binder of propellants. Gel permeation in chromatography（GPC）,Fourier transform infrared spectrum（FT-IR）,dynamic mechanical analysis（DMA） and mechanical properties were applied to characterize the ETPE obtained. The results show that when the mole ratio of-NCO/-OH is 0.98 and aging temperature is 30 ℃ for 1 day and 90 ℃ for 3 days,the number-average molecular weight and weight-average molecular weight of ETPE having 35% hard segment are 84530 and 202400 respectively,the polydispersity exponent is 2.39. The ETPE having 35% hard segment exhibits better mechanical properties （σb=14.6 MPa,εb=414%） and lower Tg （-29.6 ℃）.

关 键 词：推进剂 聚叠氮缩水甘油醚 热塑性弹性体 力学性能 

分 类 号：TB34[一般工业技术—材料科学与工程]