The development of new interfacial rheological setup (IRS) for characterizing the interfacial viscoelastic properties of polymer systems is a subject of growing interest and constitutes a well-known challenge of high scientific and industrial application value. Recently, biconical and double-wall Ring (DWR) devices that can easily be attached to standard rheometers have been marketed for this purpose, but measurements must be made below 70 °C to ensure a stable homogeneous temperature at the interface. Meanwhile each device has its own limitation: the bicone has high inertia and a relatively low Boussinesq number, giving it a low signal-to-noise ratio, while the DWR is too fragile to probe the interfaces of high viscous systems in the molten state. Currently, to predict the dynamic interfacial properties of molten polymer systems, the interfacial rheology characterization is based mainly on indirect methods such as numerical modeling. In this study, a novel high temperature resistant interfacial rheology cell has been developed. This new setup allows direct interfacial rheology measurements up to 200 °C with temperature gradients of 1 °C at the polymer-polymer interface. To validate this new IRS device, the surface/interfacial properties of different model fluids having different well-known structure and viscoelastic characteristics have been investigated. To enable a more sensitive measurement of interfacial rheological properties, lightweight titanium based biconical geometry was newly designed. The effect of the molecular weight and the temperature was highlighted. Finally, the interfacial rheology testing of molten semicrystalline polymer systems has been achieved for the first time. The measured apparent interfacial shear properties in both oscillatory and steady flow modes were carefully corrected, considering the contribution of the bulk-subphases during processing of the numerical data.

用于表征聚合物系统界面粘弹性的新界面流变学装置 (IRS) 的开发是一个日益受到关注的主题，并且构成了具有高科学和工业应用价值的众所周知的挑战。最近，可以轻松连接到标准流变仪的双锥和双壁环 (DWR) 设备已为此目的上市，但必须在 70 °C 以下进行测量，以确保界面处的温度均匀。同时每个设备都有其自身的局限性：双锥具有高惯性和相对较低的 Boussinesq 数，使其信噪比低，而 DWR 太脆弱，无法探测熔融状态下高粘性系统的界面。目前，为了预测熔融聚合物系统的动态界面特性，界面流变学表征主要基于间接方法，例如数值建模。在这项研究中，开发了一种新型耐高温界面流变电池。这种新设置允许直接进行高达 200 °C 的界面流变测量，聚合物-聚合物界面的温度梯度为 1 °C。为了验证这种新的 IRS 设备，研究了具有不同众所周知的结构和粘弹性特征的不同模型流体的表面/界面特性。为了能够更灵敏地测量界面流变特性，新设计了轻质钛基双锥几何形状。强调了分子量和温度的影响。最后，首次实现了熔融半结晶聚合物体系的界面流变测试。考虑到在数值数据处理过程中体亚相的贡献，在振荡和稳定流模式下测量的表观界面剪切特性被仔细校正。