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Unexpected entanglement dynamics in semidilute blends of supercoiled and ring DNA.
Soft Matter ( IF 2.9 ) Pub Date : 2019-11-19 , DOI: 10.1039/c9sm01767d Karthik R Peddireddy 1 , Megan Lee 1 , Yuecheng Zhou 2 , Serenity Adalbert 1 , Sylas Anderson 1 , Charles M Schroeder 2 , Rae M Robertson-Anderson 1
Soft Matter ( IF 2.9 ) Pub Date : 2019-11-19 , DOI: 10.1039/c9sm01767d Karthik R Peddireddy 1 , Megan Lee 1 , Yuecheng Zhou 2 , Serenity Adalbert 1 , Sylas Anderson 1 , Charles M Schroeder 2 , Rae M Robertson-Anderson 1
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Blends of polymers of different topologies, such as ring and supercoiled, naturally occur in biology and often exhibit emergent viscoelastic properties coveted in industry. However, due to their complexity, along with the difficulty of producing polymers of different topologies, the dynamics of topological polymer blends remains poorly understood. We address this void by using both passive and active microrheology to characterize the linear and nonlinear rheological properties of blends of relaxed circular and supercoiled DNA. We characterize the dynamics as we vary the concentration from below the overlap concentration c* to above (0.5c* to 2c*). Surprisingly, despite working at the dilute–semidilute crossover, entanglement dynamics, such as elastic plateaus and multiple relaxation modes, emerge. Finally, blends exhibit an unexpected sustained elastic response to nonlinear strains not previously observed even in well-entangled linear polymer solutions.
中文翻译：
超螺旋和环状DNA半稀释混合物中的意外纠缠动力学。
不同拓扑结构（例如环和超螺旋）的聚合物共混物自然存在于生物学中，并经常表现出工业界梦emerge以求的新兴粘弹性质。然而，由于它们的复杂性，以及生产不同拓扑结构的聚合物的困难，拓扑聚合物共混物的动力学仍然知之甚少。我们通过使用被动和主动微观流变学来表征松弛的圆形和超螺旋DNA混合物的线性和非线性流变特性，从而解决了这一空白。当我们将浓度从低于重叠浓度c *更改为高于重叠浓度（0.5 c *至2 c *）时，我们对动力学进行了表征）。出人意料的是，尽管工作在稀—半稀释交叉处，但仍出现了纠缠动力学，例如弹性高原和多种松弛模式。最后，共混物对非线性应变表现出出乎意料的持续弹性响应，即使在缠结良好的线性聚合物溶液中也未见到。
更新日期：2019-11-19
中文翻译：
超螺旋和环状DNA半稀释混合物中的意外纠缠动力学。
不同拓扑结构（例如环和超螺旋）的聚合物共混物自然存在于生物学中，并经常表现出工业界梦emerge以求的新兴粘弹性质。然而，由于它们的复杂性，以及生产不同拓扑结构的聚合物的困难，拓扑聚合物共混物的动力学仍然知之甚少。我们通过使用被动和主动微观流变学来表征松弛的圆形和超螺旋DNA混合物的线性和非线性流变特性，从而解决了这一空白。当我们将浓度从低于重叠浓度c *更改为高于重叠浓度（0.5 c *至2 c *）时，我们对动力学进行了表征）。出人意料的是，尽管工作在稀—半稀释交叉处，但仍出现了纠缠动力学，例如弹性高原和多种松弛模式。最后，共混物对非线性应变表现出出乎意料的持续弹性响应，即使在缠结良好的线性聚合物溶液中也未见到。
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