Unexpected Solvent Influence on the Rheology of Supramolecular Polymers,Macromolecules

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Unexpected Solvent Influence on the Rheology of Supramolecular Polymers
Macromolecules ( IF 5.1 ) Pub Date : 2017-08-31 00:00:00 , DOI: 10.1021/acs.macromol.7b00786
Bruno G. Alvarenga ₁ , Matthieu Raynal ₂ , Laurent Bouteiller ₂ , Edvaldo Sabadini ₁

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A very limited change in the nature of the solvent (toluene versus pentylbenzene) can have an unexpectedly strong effect on the viscosity of a hydrogen-bonded supramolecular polymer. In pentylbenzene, slightly stronger hydrogen bonds are formed than in toluene, but the supramolecular polymer solution is ca. 25 times less viscous. Several hypotheses can be envisaged to explain this counterintuitive result. We propose that this effect is actually related to a solvation effect involving the outer corona of the supramolecular objects. When the cohesive energy density of the solvent approaches the cohesive energy density of the outer corona of the supramolecular objects, the viscosity of solution is reduced, possibly because of faster local dynamics.

中文翻译：

意外的溶剂对超分子聚合物的流变学的影响

溶剂性质的非常有限的变化（甲苯与戊基苯）会对氢键合的超分子聚合物的粘度产生意想不到的强烈影响。在戊苯中，形成的氢键比在甲苯中形成的氢键稍微强一些，但超分子聚合物溶液大约为。粘性降低25倍。可以设想几种假设来解释这种违反直觉的结果。我们提出，该作用实际上与涉及超分子物体的外部电晕的溶剂化作用有关。当溶剂的内聚能密度接近超分子物体外电晕的内聚能密度时，溶液的粘度会降低，这可能是因为局部动力学更快。

更新日期：2017-08-31

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