一步法制备BAMO-THF型热塑性弹性体及其力学特性

发布时间：2018-05-28 21:43

  本文选题：BAMO-THF + 含能热塑性弹性体(ETPE)　； 参考：《固体火箭技术》2017年03期

【摘要】：以一缩二乙二醇(DEG)为扩链剂,通过一步熔融聚合法,制备得到高含量3,3-二叠氮甲基氧丁环与四氢呋喃共聚醚(BAMO-THF)型含能热塑性弹性体(ETPE)。采用傅里叶变换红外光谱(FT-IR)和广角X-射线衍射仪(WXRD)表征制备的ETPE结构,动态力学热分析(DMA)、万能材料试验机、邵氏硬度仪研究其力学性质。结果表明,制备的BAMO-THF型ETPE具有明显的叠氮型聚醚聚氨酯弹性体特征。在加载应力和温度作用下,由于其线性分子链结构,ETPE试样蠕变程度较大。此外,扩链剂含量的增加并不利于ETPE延伸率和低温性能的提高。其中软段BAMO-THF含量达到93.3%,硬段含量仅为6.7%的D20试样力学性能较佳,抗拉强度和断裂伸长率分别为3.61 MPa和1 277%,低温玻璃化转变温度为-23.4℃。
[Abstract]:Using diethylene glycol (DEG) as chain extender, a kind of energetic thermoplastic elastomer (ETPEPe) was prepared by one-step melt polymerization with high content of 3-diazo methyl oxybutyl ring and tetrahydrofuran co-polyether (BAMO-THFR). The ETPE structure was characterized by Fourier transform infrared spectroscopy (FTIR) and wide angle X-ray diffractometer (WXRD). The mechanical properties were studied by dynamic mechanical thermal analysis (DMA), universal material testing machine and Shao hardness tester. The results showed that the BAMO-THF type ETPE had obvious properties of azide polyether polyurethane elastomer. Under the action of loading stress and temperature, the creep degree of ETPE specimen is higher because of its linear molecular chain structure. In addition, the increase of chain extender content is not conducive to the increase of elongation and low temperature performance of ETPE. The tensile strength and elongation at break were 3.61 MPa and 1.277 MPa, respectively, and the glass transition temperature at low temperature was -23.4 鈩，

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