以1,4-丁二醇（BDO）为扩链剂,采用熔融预聚二步法合成了不同硬段含量的聚叠氮缩水甘油醚聚氨酯弹性体（GAPE）。运用动态热机械分析仪（DMA）研究其动态力学性能,得到GAPE的储能模量、损耗模量、损耗因子,进而运用时温叠加原理,合成频率跨越十几个数量级范围的主曲线,并计算出WLF方程的粘弹系数C1g和C2g,以及链段运动活化能、低温脆化参数。结果表明,硬段质量分数为33%的GAPE-2在-50℃储能模量达到6000MPa,而其低温脆化参数和活化能也较低,分别为55.6和271.0 kJ/mol,是一种刚性好、韧性高、脆性低的弹性体。
Gap-based polyurethane elastomer（GAPE） was synthesized through meltprepolymerization method using 1,4-butanediol（BDO） as chain extender.Dynamic mechanical analysis（DMA） was applied to research the dynamic mechanical properties of GAPE.Based on the time-temperature superposition theory,the master curves with frequency spanning over ten several orders of magnitude range were obtained.The constants C1g and C2g of WLF equation were calculated.The dynamic mechanical properties parameters,activation energy and fragility parameter of GAPE were obtained.The results show that storage modulus of GAPE-2 having 33% hard segment was 6000 MPa at-50 ℃.The low-temperature fragility parameter and activation energy of GAPE-2 are 55.6 and 271.0 kJ/mol,respectively.
参考文献
| [1] | 左海丽,肖乐勤,菅晓霞,周伟良,徐复铭.GAP/MDI/DEG含能热塑性弹性体的合成与性能[J].高分子材料科学与工程,2010(12):20-23. |
| [2] | 菅晓霞,肖乐勤,左海丽,周伟良,徐复铭.GAP基热塑性弹性体的合成及表征[J].含能材料,2008(05):614-617. |
| [3] | Sheng, X.;Akinc, M.;Kessler, M.R. .Creep behavior of bisphenol E cyanate ester/alumina nanocomposites[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(21/22):5892-5899. |
| [4] | 张伟,樊学忠,张腊莹,刘子如,蔚红建.NEPE推进剂低温瞬态的粘弹特性[J].固体火箭技术,2009(03):298-301,343. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%