GAP-PCL含能热塑性弹性体的合成及力学性能  

Synthesis and mechanical properties of energetic thermoplastic elastomers based on glycidyl azide polymer and polycaprolactone

作　　者：胡义文[1] 邓敏[1] 周伟良[1] 肖乐勤[1] 菅晓霞[1] 

机构地区：[1]南京理工大学化工学院,南京210094

出　　处：《固体火箭技术》2016年第4期492-496,共5页Journal of Solid Rocket Technology

摘　　要：为改善GAP基含能热塑性弹性体(ETPEs)粘合剂的力学性能,通过溶液共聚,以一缩二乙二醇(DEG)为扩链剂,合成得到聚叠氮缩水甘油醚/聚己内酯(GAP/PCL)含能热塑性弹性体。通过傅里叶变换红外光谱(FTIR)对合成的ETPEs进行结构表征,万能材料拉伸机和动态热机械分析(DMA)测试其力学性能。研究比较—NCO/—OH摩尔比(R值)、扩链剂用量、异氰酸酯种类和软段中GAP/PCL质量比对ETPE力学性能的影响。结果表明,制备的ETPEs具有典型的叠氮聚醚聚氨酯特征;确定当R=1.15,DEG的羟基占总反应羟基的40%时,ETPEs的力学性能较好,抗拉强度为13.50 MPa、断裂伸长率为1 654%,升高软段中PCL的含量时,试样力学性能上升明显;低温力学性能中,软段柔顺性好的PCL的引入,会降低ETPEs的储能模量,玻璃化转变温度Tg最低可至-30.4℃。To improve the mechanical performance of energetic thermoplastic elastomers（ ETPEs） based on GAP,a series of glycidyl azide polymer（ GAP） / polycaprolactone（ PCL） copolyol based energetic thermoplastic elastomers（ ETPEs） were synthesized by solution copolymerization using diethylene glycol（ DEG） as chain extender. The synthesized ETPEs structure were characterized by fourier transform infrared spectroscopy（ FTIR）,and their mechanical properties were measured by universal testing machine and dynamic mechanical analysis（ DMA）.The effects of the molar ratio of —NCO / —OH（ R）,the amount of chain extender,types of isocyanates,and GAP / PCL mass ratio in soft segment on GAP / PCL ETPEs were investigated by measuring their mechanical properties.The results reveal that the synthesized ETPEs have typical features of azido-typed polyether-based polyurethane.When R is 1.15 and the —OH offered by DEG accounts for 40% of total —OH involved in the reaction,the ETPEs exhibit good mechanical properties,and their tensile strength reaches 13.50 MPa while elongation at break also attains 1 654%.Moreover,the mechanical properties improve strongly as the PCL increase in soft segment.The introduction of PCL with good flexibility can reduce the storage modulus of ETPEs,and the glass transition temperature（ Tg） reaches-30.4 ℃.

关 键 词：GAP 含能热塑性弹性体 力学性能 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]