Concentration Dependence of the Extensional Relaxation Time and Finite Extensibility in Dilute and Semidilute Polymer Solutions Using a Microfluidic Rheometer,Macromolecules

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Concentration Dependence of the Extensional Relaxation Time and Finite Extensibility in Dilute and Semidilute Polymer Solutions Using a Microfluidic Rheometer
Macromolecules ( IF 5.1 ) Pub Date : 2019-12-10 , DOI: 10.1021/acs.macromol.9b01143
Seo Gyun Kim ₁ , Heon Sang Lee ₁

Affiliation

We investigated the composition dependence of the finite extensible nonlinear elastic (FENE) constant of poly(ethylene oxide) (PEO) solutions by the Tikhonov regularization method with the measured normal stress in microfluidic channels. We measured the normal stress of the PEO solutions in response to the extensional flows in microfluidic channels. Additionally, we extracted the extensional relaxation time distributions and the FENE constants of the PEO solutions from the measured normal stress by inverse calculations. The linear average value of the extensional relaxation times was consistent with that measured using a capillary breakup extensional rheometer. The shortest extensional relaxation time was close to the mean value of the Zimm relaxation time distribution. The FENE constant evaluated in the semidilute regime was 10.3 times higher than that in the dilute regime. The proposed method is promising for the determination of the Zimm time, FENE constant, as well as the extensional relaxation times of low-viscosity solutions.

中文翻译：

使用微流变仪在稀和半稀聚合物溶液中延伸弛豫时间和有限可扩展性的浓度依赖性

我们通过Tikhonov正则化方法和在微流体通道中测得的法向应力，研究了聚环氧乙烷（PEO）溶液的有限可扩展非线性弹性（FENE）常数的成分依赖性。我们测量了PEO解决方案的法向应力，以响应微流体通道中的扩展流动。此外，我们通过反计算从测得的法向应力中提取了PEO溶液的拉伸弛豫时间分布和FENE常数。伸长弛豫时间的线性平均值与使用毛细管破裂伸长流变仪测得的线性平均值一致。最短的拉伸弛豫时间接近Zimm弛豫时间分布的平均值。在半稀释状态下评估的FENE常数为10。是稀释状态下的3倍。所提出的方法有望确定Zimm时间，FENE常数以及低粘度溶液的延伸弛豫时间。

更新日期：2019-12-11

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