Viscoelastic properties of ring-linear DNA blends exhibit nonmonotonic dependence on blend composition

K. Peddireddy, Megan Lee, Charles M. Schroeder, R. Robertson-Anderson
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引用次数: 15

Abstract

Entangled ring polymers, along with blends of ring and linear polymers, continue to be a topic of great interest and debate due to the conflicting experimental results in the literature as well as the difficulty of producing entangled synthetic rings devoid of linear contaminants. Here, we create blended solutions of entangled ring and linear DNA with varying mass fractions of linear DNA. We use optical tweezers microrheology to measure the linear and nonlinear viscoelastic response of these blends. Our measurements reveal a strong non-monotonic dependence of linear viscoelastic properties on linear DNA fraction, with a pronounced maximum when the mass fraction of rings and linear chains are comparable, suggestive of pervasive threading of rings by linear chains. We observe a similar non-monotonicity in the nonlinear regime; however, a comparatively higher fraction of linear chains (0.5-0.7) is required for a substantial increase in resisitive force and slowing of relaxation dynamics to emerge. This nonlinear response also appears to be rate dependent, which we argue arises from force-induced de-threading of rings at high strain rates. Our results fill a longstanding gap in knowledge regarding the microrheology and nonlinear response of ring-linear polymer blends. Moreover, the uniquely strong mechanical response that ring-linear blends exhibit, along with the ability to finely tune these blends by varying the blend composition, provides new materials design principles.
环状线性DNA共混物的粘弹性性能与共混物的组成呈非单调关系
由于文献中相互矛盾的实验结果以及生产没有线性污染物的缠绕合成环的困难,纠缠环状聚合物以及环状和线性聚合物的共混物仍然是一个非常有趣和有争议的话题。在这里,我们用不同质量分数的线性DNA创建纠缠环和线性DNA的混合溶液。我们用光学镊子微流变学测量了这些共混物的线性和非线性粘弹性响应。我们的测量揭示了线性粘弹性特性对线性DNA分数的强烈非单调依赖性,当环和线性链的质量分数相当时,具有明显的最大值,表明线性链对环的普遍穿线。我们在非线性区域观察到类似的非单调性;然而,相对较高的线性链比例(0.5-0.7)需要电阻力的大幅增加和弛豫动力学的减缓。这种非线性响应似乎也与速率有关,我们认为这是由高应变速率下环的力诱导脱线引起的。我们的研究结果填补了长期以来在环形线性聚合物共混物的微流变学和非线性响应方面的知识空白。此外,环形线性共混材料所表现出的独特的强机械响应,以及通过改变共混成分来精细调整这些共混材料的能力,提供了新的材料设计原则。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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