资料摘要
资料下载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.
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毛细管流变仪ISO测试标准
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探讨:什么样的DMA才真正满足我们的应用
简介:目前,越来越多的DMA/DMTA 进入中国市场。让我们有更多的选择。然而,同时也会给我们在设备选型的时候带来很多困惑 - 什么样的DMA/DMTA 才真正满足我们的应用?力值范围和频率范围是两个最重要的指标。下面我仅从这两方面提几点看法,希望能对我们的选型有所帮助。
什么样的DMA/DMTA 才真正满足我们的应用?
简介:目前,越来越多的DMA/DMTA 进入中国市场。让我们有更多的选择。然而,同时也会给我们在设备选型的时候带来很多困惑 - 什么样的DMA/DMTA 才真正满足我们的应用?力值范围和频率范围是两个最重要的指标。下面我仅从这两方面提几点看法,希望能对我们的选型有所帮助。
动态热机械分析仪DMA用于聚甲醛树脂蠕变方面的研究
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