This work studied the adsorption at dodecane/water interface of amphiphilic polysaccharides derived from dextran (a nonionic bacterial polysaccharide) by random attachment of phenoxy groups along the chains (between 10 and 20 attached phenoxy groups per 100 glucose repeat units). The long-time kinetics of interfacial tension decrease was satisfactorily described assuming diffusion-limited adsorption of hydrophobic units (over 4 hours). Dilational rheology of dodecane/water interface was studied for the first time with that kind of amphiphilic polysaccharides and evidenced a significant elastic component. For all dextran derivatives, experimental results were conveniently described using Lucassen-van den Tempel model which assumed diffusion-limited of surface active species. The characteristic frequency increased with the number of attached phenoxy groups and its order of magnitude (10⁻³-10⁻² rad.s⁻¹) was consistent with estimations based on the previous model. Experimental results were compared to those obtained with commercial stabilizers like Pluronics (L64, P105, F68 and F127) and Tween 80.

中文翻译：

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葡聚糖衍生的两亲多糖覆盖的油/水界面的扩张流变学

这项研究研究了右旋糖酐（一种非离子细菌多糖）的两亲性多糖在十二烷/水界面的吸附作用，方法是沿链随机连接苯氧基（每100个葡萄糖重复单元10至20个连接的苯氧基）。假设疏水单元的扩散受限吸附（超过4小时），令人满意地描述了界面张力降低的长期动力学。首次用这种两亲性多糖研究了十二烷/水界面的膨胀流变学，并证明了其重要的弹性成分。对于所有葡聚糖衍生物，使用Lucassen-van den Tempel模型方便地描述了实验结果，该模型假定表面活性物质的扩散受到限制。^-3 -10 ^-2  rad.s ^-1）与基于先前模型的估计一致。将实验结果与使用诸如Pluronics（L64，P105，F68和F127）和Tween 80的商业稳定剂获得的结果进行了比较。