方案摘要
方案下载| 应用领域 | |
| 检测样本 | |
| 检测项目 | |
| 参考标准 |
We have investigated the dynamic mechanical behavior of two cross-linked polymer networks with very different topologies: one made of backbones randomly linked along their length; the other with fixed-length strands uniformly cross-linked at their ends. The samples were analyzed using oscillatory shear, at very small strains corresponding to the linear regime. This was carried out at a range of frequencies, and at temperatures ranging from the glass plateau, through the glass transition, and well into the rubbery region. Through the glass transition, the data obeyed the time-temperature superposition principle, and could be analyzed using WLF treatment. At higher temperatures, in the rubbery region,the storage modulus was found to deviate from this, taking a value that is independent of frequency.This value increased linearly with temperature, as expected for the entropic rubber elasticity, but with a substantial negative offset inconsistent with straightforward enthalpic effects. Conversely, the loss modulus continued to follow time-temperature superposition, decreasing with increasing temperature, and showing a power-law dependence on frequency.
仪尊科技：温度对涤纶纤维力学性能的影响
仪尊科技：各向同性弹性体材料动态剪切模量
仪尊科技：向列式弹性体交联分布对动态力学性能的影响
相关产品
关注
拨打电话
留言咨询
