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 ℃）.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2010年第12期20-23,共4页
Polymer Materials Science & Engineering
关键词
推进剂
聚叠氮缩水甘油醚
热塑性弹性体
力学性能
propellant
glycidyl azide polymer
energetic thermoplastic elastomer
mechanical property
