氧化/水解稳定性优异的聚异丁烯基聚氨酯的合成与表征（英文）

Synthesis and characterization of polyisobutylene-based polyurethane with excellent oxidative / hydrolytic stability

设计合成了不同聚异丁烯含量的聚异丁烯基聚氨酯材料,并对其结构、力学性能、阻尼性能、热性能和微观形貌分别进行了傅里叶变换红外光谱、动态热机械、扫描电子显微镜和热重分析。结果表明,以聚异丁烯为软段的聚异丁烯基聚氨酯材料,在聚异丁烯质量分数为60%时具有最佳的力学性能和阻尼性能,最大阻尼因子可以达到0.83,且阻尼因子大于0.3的温域从-60℃到27℃。此外还研究了聚异丁烯基聚氨酯的耐氧化/水解稳定性,将聚异丁烯基聚氨酯浸泡在35%的硝酸溶液中18 h,定量分析浸泡前后其拉伸强度和拉伸模量的变化情况,结果表明聚异丁烯基聚氨酯材料具有优异的耐氧化/水解稳定性。

The design, synthesis, and characterization of polyisobutylene-based polyurethane （PIB-based PU） with various contents of polyisobutylene were presented. The structure, damping, thermal, and mechani- cal properties of PIB-based PU were characterized by Fourier transform infrared spectroscopy, dynamic mechanical analysis, scanning electron microscopy and thermo-gravimetric analysis. The results showed that the PIBbased PU containing mass fraction 60% polyisobutylene as soft segment exhibited the best mechanical and damping properties（maximum loss factor O. 83） with wide temperature range（ - 60 - 27 ℃ ） at loss factor over 0.-3 compared to the PIB-based PU with other contents of polyisobutylene. Additionally, the tensile strength and modulus of various PIB-based PU were determined before and after agitating in 35% nitric acid solutions and retentions were quantified. The PIB-based PU presented significant oxidative/hydrolytic resistance, the tensile strength and modulus of PIB-based PU containing various polyisobutylene remained essentially unchanged upon exposure to nitric acid.