聚醚多元醇动态黏弹性能的研究

Dynamic Viscoelastic Properties of Polyether Polyols

研究了不同相对分子质量的聚醚多元醇的动态黏弹性能,探索了聚醚的分子量对动态黏弹性能的影响。利用AR2000流变仪通过进行应力扫描、温度扫描、频率扫描,分别得到了聚醚复数黏度、损耗模量随温度、频率以及应力的变化关系。结果表明,低分子量的聚醚三元醇中具有稳定的黏性结构。聚醚三元醇的损耗模量随温度降低,随频率增大,其损耗模量与温度、频率的关系对相对分子质量具有依赖性。

The dynamic viscoelastic properties of polyether polyols with different molecular weights was tested by AR-2000 advanced rheometer and the influence of molecular weight,the frequency,temperature and stress sweep were carried out on the parallel plate geometry respectively,the dependence of the complex viscosity and the loss modulus of polyether on the shifted frequency,temperature and stress were investigated.It is found that viscosities of polyether with high molecular weight are more sensitive to shear rate and less sensitive to temperature than those with low molecular weight.The polyether with low molecular weight shows better stability in respect of viscosity and elasticity than those with high molecular weight.