GAP-PCL含能热塑性弹性体的合成及力学性能
发布时间：2018-11-25 09:41
【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℃。
[Abstract]:In order to improve the mechanical properties of GAP based thermoplastic elastomer (ETPEs) adhesive, diethylene glycol (DEG) was used as chain extender by solution copolymerization. Poly (glycidyl azide) / polycaprolactone (GAP/PCL) thermoplastic elastomer was synthesized. The structure of the synthesized ETPEs was characterized by Fourier transform infrared spectroscopy (FTIR). The mechanical properties of the synthesized ETPEs were tested by tensile machine and dynamic thermo-mechanical analysis (DMA). The effects of molar ratio of NCO/-OH (R value), amount of chain extender, type of isocyanate and mass ratio of GAP/PCL in soft segment on the mechanical properties of ETPE were studied. The results show that the prepared ETPEs has typical azido-polyether polyurethane characteristics. It is determined that when the hydroxyl groups of RG1.15DEG account for 40 of the total reaction hydroxyl groups, the mechanical properties of ETPEs are better, the tensile strength is 13.50 MPa, and the elongation at break is 1 654. When the content of PCL in the soft segment is increased, the mechanical properties of the samples increase obviously. In the low temperature mechanical properties, the introduction of PCL with good flexibility in soft section will reduce the storage modulus of ETPEs, and the glass transition temperature (Tg) can be as low as -30.4 鈩，
本文编号：2355650
[Abstract]:In order to improve the mechanical properties of GAP based thermoplastic elastomer (ETPEs) adhesive, diethylene glycol (DEG) was used as chain extender by solution copolymerization. Poly (glycidyl azide) / polycaprolactone (GAP/PCL) thermoplastic elastomer was synthesized. The structure of the synthesized ETPEs was characterized by Fourier transform infrared spectroscopy (FTIR). The mechanical properties of the synthesized ETPEs were tested by tensile machine and dynamic thermo-mechanical analysis (DMA). The effects of molar ratio of NCO/-OH (R value), amount of chain extender, type of isocyanate and mass ratio of GAP/PCL in soft segment on the mechanical properties of ETPE were studied. The results show that the prepared ETPEs has typical azido-polyether polyurethane characteristics. It is determined that when the hydroxyl groups of RG1.15DEG account for 40 of the total reaction hydroxyl groups, the mechanical properties of ETPEs are better, the tensile strength is 13.50 MPa, and the elongation at break is 1 654. When the content of PCL in the soft segment is increased, the mechanical properties of the samples increase obviously. In the low temperature mechanical properties, the introduction of PCL with good flexibility in soft section will reduce the storage modulus of ETPEs, and the glass transition temperature (Tg) can be as low as -30.4 鈩，
本文编号：2355650
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