为改善聚叠氮缩水甘油醚(GAP)基黏合剂的低温力学性能,以GAP和环氧乙烷-四氢呋喃共聚醚(PET)为软段,甲苯-2,4-二异氰酸酯(TDI)偶联的丁二醇为硬段,通过扩链聚合反应合成GAP/PET嵌段型热塑性聚氨酯弹性体; 分别采用红外光谱(FT-IR)、核磁共振(NMR)、差示扫描量热分析(DSC)、动态热机械分析(DMA)、热重分析(TGA)和万能材料试验机对其化学结构、玻璃化转变温度、热稳定性和低温拉伸性能进行表征。结果表明,随着PET含量的提高,GAP/PET嵌段型热塑性聚氨酯的Tg明显降低,当PET与GAP摩尔比为1:1时,GAP/PET嵌段型热塑性聚氨酯的Tg为-37.7℃,在-40℃低温环境发生韧性断裂,断裂强度为25.78MPa,断裂伸长率为379.4%,具有优异的低温力学性能; 同时TGA试验表明GAP/PET嵌段型热塑性聚氨酯Td>220℃,热稳定性好。
Abstract
In order to enhance the cryogenic mechanical properties of glycidyl azide polymer(GAP)based polymeric binders, GAP/PET block thermoplastic elastomers were synthesized via a chain extension polymerization using GAP and ethylene oxide-tetrahydrofuran copolyether(PET)as soft segments, and toluene diisocyanate(TDI)extended butane diol(BDO)as hard segments. The molecular structure, glass transition temperature(Tg), thermal stability and cryogenic mechanical properties of thermoplastic elastomers were investigated by fourier transform-infrared spectroscopy(FT-IR), nuclear magnetic resonance spectrometry(NMR), differential scanning calorimetry(DSC), dynamic mechanical analysis(DMA), thermal gravimetric analyzer(TGA)and universal testing machine respectively. The results show that the Tg of the thermoplastic elastomers are evidently decreased with increasing the content of PET. When the mole ratio of PET/GAP is 1:1, the Tg is found to be -37.7℃, and the thermoplastic elastomer is ductile rupture under the low temperature of -40℃, the tensile strength at break is 25.78MPa, and the corresponding elongation is 379.4%. Therefore, the thermoplastic elastomers exhibit good cryogenic mechanical properties. Meanwhile, the TGA results indicate that the Td of the thermoplastic elastomers are higher than 220℃ and exhibit good thermal stability.
关键词
物理化学 /
聚叠氮缩水甘油醚 /
GAP /
PET /
嵌段热塑性弹性体 /
低温力学性能
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Key words
physical chemistry /
glycidyl azide polymer /
GAP /
PET /
block thermoplastic elastomers /
cryogenic mechanical properties
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