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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Equilibrium and out-of-equilibrium dynamics in a molecular layer of azopolymer floating on water studied by Interfacial Shear Rheology
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Equilibrium and out-of-equilibrium dynamics in a molecular layer of azopolymer floating on water studied by Interfacial Shear Rheology

机译：界面剪切流变学研究的漂浮在水中的偶氮聚合物分子层中的平衡和非平衡动力学

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摘要

We report the details of the construction and calibration of a sensitive surface rheometer, inspired by an instrument described in the literature, adapted to the study of photosensitive polymeric materials. By high resolution video tracking of the motion of a floating magnetized needle we are able to measure the viscoelastic complex shear modulus G of a Langmuir monolayer with an accuracy of 5*10~(- 6) N/m. This instrument is then employed for the rheological characterization of a Langmuir monolayer of a photosensitive azobenzene polymer, which can be brought out of equilibrium by a suitable photoperturbation. The shear modulus is measured as a function of temperature, illumination power and wavelength. The reversible rheological changes induced in the film by photo-perturbation are monitored during time, observing a transition from a predominantly elastic (G mainly real) to a viscoelastic regime (real and imaginary parts of G comparable). These results are confirmed by a comparison with independent measurements performed using other rheological techniques. Finally a discussion is made, taking into account the results of a recent X-ray photon correlation spectroscopy (XPCS) experiment on the same polymer in equilibrium and out of equilibrium.
机译：我们报告敏感表面流变仪的构造和校准的详细信息，其受文献中描述的仪器的启发，适用于光敏聚合物材料的研究。通过对浮动磁化针运动的高分辨率视频跟踪，我们能够以5 * 10〜（-6）N / m的精度测量Langmuir单层的粘弹性复数剪切模量G。然后将该仪器用于光敏偶氮苯聚合物的Langmuir单层的流变学表征，可以通过适当的光扰动使其失去平衡。剪切模量作为温度，照明功率和波长的函数进行测量。在一段时间内，监测由光扰动在薄膜中引起的可逆流变学变化，观察到从主要是弹性的（G主要是实数）到粘弹性态（G的实部和虚部可比）的过渡。通过与使用其他流变技术进行的独立测量进行比较，可以证实这些结果。最后，结合最近的X射线光子相关光谱法（XPCS）在平衡和不平衡状态下对相同聚合物进行的实验结果，进行了讨论。

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