不同温度下丁羟包覆层的横向弛豫时间与拉伸性能的相关性

Correlation Between Transverse Relaxation Time and Tensile Properties of HTPB Inhibitor at Different Temperature

为了研究不同温度下丁羟包覆层的横向弛豫时间与拉伸性能的相关性,开展了核磁共振和拉伸应力-应变性能测定试验。单因素方差分析表明温度对横向弛豫时间有显著影响;试验温度从30℃升到90℃,横向弛豫时间呈线性增大;90℃升到130℃,横向弛豫时间先减小后增大。30～90℃,升温使包覆层的拉伸强度下降,断裂伸长率升高;在100℃较90℃强度得到了提高,断裂伸长率稍有降低;在100～130℃时,受复杂化学反应和分子热运动共同影响,断裂伸长率迅速增加,强度降低。断裂伸长率、拉伸强度均与横向弛豫时间存在较好的相关性,利用该关系可以预测丁羟包覆层在不同横向弛豫时间下的拉伸性能。

The tests of nuclear magnetic resonance(NMR)and tensile mechanical properties were undertaken,aimingto analyze the correlation between the transverse relaxation time and tensile properties of hydroxyl-terminated polybutadiene(HTPB)inhibitor at different temperature. One-way analysis of variance shows that temperature has a significant influenceon transverse relaxation time. Transverse relaxation time increases linearly while the test temperature rises from 30 ℃ to90 ℃. From 90 ℃ to 130 ℃,transverse relaxation time decreases,then follows by an increase. Within the range from 30 ℃to 90 ℃,the rise of temperature brings down tensile strength,and makes elongation at break increase. The strength of thematerial at 100 ℃ is higher than that at 90 ℃,but the elongation is a slight lower. However,raising the temperature from100 ℃ to 130 ℃,the elongation at break increases drastically while the material loses its strength,due to the influenceof complicated chemical reaction and molecular thermal motion. Moreover,both the elongation at break and the tensilestrength have the good correlations with transverse relaxation time. Based on that raltionship,the tensile mechanicalproperties of HTPB inhibitor can be predicted at different transverse relaxation time.