Proceeding of EDISON Challenge (EDISON SW 활용 경진대회 논문집)
- 2016.03a
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- Pages.147-154
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- 2016
General picture of co-nonsolvency for linear and ring polymers
- Park, Gyehyun (Department of Chemistry, Seoul National University) ;
- Lee, Eunsang (Department of Chemistry, Seoul National University) ;
- Jung, YounJoon (Department of Chemistry, Seoul National University)
- Received : 2016.03.02
- Published : 2016.03.22
Abstract
Co-nonsolvency is a puzzling phenomenon that a polymer swells in a good solvent individually, but it collapses in a mixture of good solvents. This structural transition with changing solvent environment has been drawing attention due to practical application for stimuli-responsive polymer. The aim of this work is to describe the physical origin of the co-nonsolvency. In this work, we present Monte Carlo simulations for polymer solutions by using simple and general model. We simulate linear and ring polymers to compare their co-nonsolvency behaviors. Calculating Flory exponents and bridging fractions gives a good description for polymer structures. While the polymer structure shows non-monotonous behavior with increasing the cosolvent fraction, the chemical potential decreases monotonously. This indicates that coil-to-globule transition of polymers is purely controlled by free energy and can be regarded as a thermodynamics transition. We also present that ring polymers have higher looping probability than linear polymers, thus the bridging fraction remains higher at high cosolvent fraction. Our study provides a new perspective to understand polymer structure when the polymer "dissolves well" in any solvent.
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