水凝胶在polymer溶液中剪切诱导接触斑图形成
Shearing-induced contact pattern formation in hydrogels sliding in polymer solution
摘要：
在高分子浓溶液中，原位观察了旋转剪切过程中水凝胶与玻璃表面的接触。首次观察到与凝胶的旋转剪切同相旋转的动态接触图案。随着剪切时间的延长，接触斑图在圆周方向上呈现出周期性，并逐渐发展为精细的特征。在较高的滑动速度、聚合物浓度和正常压力下，图案出现得更快。此外，凝胶的柔软度也显著影响图案的特征。根据聚合物溶液在旋转软界面处的非线性流变性讨论了斑图形成。
英文摘要：
The contact of a hydrogel during the rotational shearing on glass surface in concentrated polymer solution was observed in situ. Dynamic contact patterns that rotate in-phase with the rotational shearing of the gel were observed for the first time. The contact patterns with a periodicity in the circumferential direction appeared and developed into fine characters with the shearing time. The patterns appeared more quickly at elevated sliding velocity, polymer concentration, and normal pressure. Furthermore, the softness of the gel also substantially influenced the character of the patterns. The pattern formation was discussed in terms of the non-linear rheology of the polymer solution at the rotational soft interface.
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