Study of rheological property of nylon‐1212 with Haake Rheometer
Study of rheological property of nylon‐1212 with Haake Rheometer
复制标题
DOI：
10.1002/app.11929
复制
发表时间：
2003-07
影响因子：
3
通讯作者：
Chenggui Zhang;Minying Liu;Qingxiang Zhao;Yudong Wang;Songtao Liu
中科院分区：
文献类型：
--
作者：
Chenggui Zhang;Minying Liu;Qingxiang Zhao;Yudong Wang;Songtao Liu
用Haake流变仪研究了尼龙-1212的流变特性。讨论了剪切速率和温度对尼龙-1212表观粘度的影响。得到了非牛顿指数与温度的相关性。结果表明，表观粘度随温度的升高而降低。随着剪切速率的增加，尼龙-1212的剪切变薄现象明显。根据聚合物的温度依赖关系，得到了黏性流动活化能。结果表明，在低剪切应力条件下，黏性流动活化能较高，表观粘度对温度敏感；在高剪切应力条件下，黏性流动活化能较低，温度对表观粘度的影响较弱。研究了尼龙-1212的蠕变和弹性回复率。通过蠕变试验，确定了195℃和190℃尼龙-1212熔体的线性粘弹性范围分别为1.0和5.0 Pa。在较低的剪应力下，发现蠕变和恢复阶段具有时间依赖性。然而，在较高的剪切应力下，蠕变和恢复阶段与时间无关。
Rheological properties of nylon-1212 have been studied by means of Haake Rheometer. The effect of shear rate and temperature on the apparent vicosity of nylon-1212 was discussed. A correlation of non-Newtonian index with the temperature was obtained. The results showed that the apparent viscosity decreases with the increase of the temperature. With increasing shear rate, shear thinning of nylon-1212 was observed clearly. From the relation of the temperature dependence of the polymer, we obtained the viscous flow activation energy. We conclude that the apparent viscosity is sensitive to temperature at lower shear stress because of higher viscous flow activation energy, and the temperature affect on the apparent viscosity becomes weaker at higher shear stress because of lower viscous flow activation energy. We have investigated the creep and elastic recovery of nylon-1212. A creep test was carried out to define the linear viscoelastic range as 1.0 and 5.0 Pa for 195 and 190°C nylon-1212 melts, respectively. A time-dependent response was found for the creep and recovery phases at a lower applied shear stress. However, at higher shear stress, the creep and recovery phases were time-independent.