Elucidation of viscoelastic phase separation in polymer systems
Subject Areas :
1 -
Keywords: Viscoelastic phase separation, Dynamic asymmetry, Polymer solutions, Polymer blends, Rheology,
Abstract :
To further understand phase separation as a fundamental phenomenon in the development and control of spatially heterogeneous patterns in polymer systems, it was argued that phase separation in these systems is generally belongs to “viscoelastic phase separation”, in which the morphology of the system is influenced not only by the mechanical equilibrium of thermodynamic force, but also by viscoelastic force. The origin of the viscoelastic force is the dynamic asymmetry between the components of the polymeric mixture, which can be caused by size differences or differences in glass transition temperatures between the components. Such dynamic asymmetry usually occurred in polymer solutions and polymer blends, which universally lead to a new kinetic path, called a transient gel state, upon their phase separation. A transient gel is a state in which the characteristic deformation rate produced by phase separation is faster than the characteristic rheological relaxation rate. The basic features of viscoelastic phase separation, which originates from transient gel formation, were predicted to be common to any “dynamically asymmetric” fluids with large size differences between the constituent components, such as polymer solutions. Furthermore, the evolution of the structural pattern in polymer solutions and polymer blends is essentially similar and there is no qualitative difference between the two cases, suggesting a universal nature of viscoelastic phase separation in dynamically asymmetric mixtures regardless of the origin of the asymmetry
.
References:
[1] A. Onuki, Phase transition dynamics, Cambridge University Press, 2002.
[2] L. Utracki, B. Favis, Polymer alloys and blends, Marcel Dekker: New York, 1989.
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[1] A. Onuki, Phase transition dynamics, Cambridge University Press, 2002.
[2] L. Utracki, B. Favis, Polymer alloys and blends, Marcel Dekker: New York, 1989.
[3] H. Tanaka, Universality of viscoelastic phase separation in dynamically asymmetric fluid mixtures, Physical review letters 76(5) (1996) 787.
[4] K. Yoshimoto, T. Taniguchi, Viscoelastic phase separation model for ternary polymer solutions, The Journal of chemical physics 154(10) (2021).
[5] A. Brunk, B. Dünweg, H. Egger, O. Habrich, M. Lukáčová-Medvid'ová, D. Spiller, Analysis of a viscoelastic phase separation model, Journal of Physics: Condensed Matter 33(23) (2021) 234002.
[6] S. Ge, S. Samanta, B. Li, G.P. Carden, P.-F. Cao, A.P. Sokolov, Unravelling the mechanism of viscoelasticity in polymers with phase-separated dynamic bonds, ACS nano 16(3) (2022) 4746-4755.
[7] A. Surendran, J. Joy, J. Parameswaranpillai, S. Anas, S. Thomas, An overview of viscoelastic phase separation in epoxy based blends, Soft Matter 16(14) (2020) 3363-3377.
[8] H. Tanaka, Critical dynamics and phase separation kinetics in dynamically asymmetric binary fluids: New dynamic universality class for polymer mixtures or dynamic crossover?, The Journal of chemical physics 100(7) (1994) 5323-5337.
[9] H. Tanaka, Y. Nakanishi, N. Takubo, Nonuniversal nature of dynamic critical anomaly in polymer solutions, Physical Review E 65(2) (2002) 021802.
[10] A. Kostko, M. Anisimov, J. Sengers, Dynamic crossover to tricriticality and anomalous slowdown of critical fluctuations by entanglements in polymer solutions, Physical Review E 66(2) (2002) 020803.
[11] A. Furukawa, Viscoelastic effect on hydrodynamic relaxation in polymer solutions, Journal of the Physical Society of Japan 72(2) (2003) 209-212.
[12] A. Furukawa, Dynamic critical phenomena of polymer solutions, Journal of the Physical Society of Japan 72(6) (2003) 1436-1445.
[13] H. Tanaka, T. Araki, Viscoelastic phase separation in soft matter: Numerical-simulation study on its physical mechanism, Chemical engineering science 61(7) (2006) 2108-2141.
[14] H. Tanaka, Unusual phase separation in a polymer solution caused by asymmetric molecular dynamics, Physical review letters 71(19) (1993) 3158.
[15] H. Tanaka, Viscoelastic model of phase separation, Physical Review E 56(4) (1997) 4451.
[16] H. Tanaka, Viscoelastic phase separation, Journal of Physics: Condensed Matter 12(15) (2000) R207.
[17] H. Tanaka, Viscoelastic phase separation in soft matter and foods, Faraday discussions 158(1) (2012) 371-406.
[18] H. Tanaka, Viscoelastic model of phase separation in colloidal suspensions and emulsions, Physical Review E 59(6) (1999) 6842.
[19] H.R. Heydarnezhad, N. Mohammadi, A. Arbe, A. Alegria, How does microstructural design affect the dynamics and rheology of segmented polyurethanes?, Macromolecules 53(13) (2020) 5381-5398.
[20] H.R. Heydarnezhad, N. Mohammadi, A. Alegria, Non-Einstein rheology in segmented polyurethane nanocomposites, Macromolecules 54(6) (2021) 2783-2796.
[21] J. Jackle, M. Pieroth, Theory of structural evolution in viscoelastic binary liquid mixtures after a temperature jump, Zeitschrift Physik B Condensed Matter 72(1) (1988) 25-39.
[22] D. Sappelt, J. Jackle, Spinodal decomposition with formation of a glassy phase, EPL (Europhysics Letters) 37(1) (1997) 13.
[23] D. Sappelt, J. Jackle, Computer simulation study of phase separation in a binary mixture with a glass-forming component, Physica A: Statistical Mechanics and its Applications 240(3) (1997) 453-479.
[24] D. Sappelt, J. Jackle, Percolation inversion in spinodal decomposition of mixtures with strong kinetic asymmetry, Polymer 39(21) (1998) 5253-5256.
[25] P. De Gennes, Dynamics of entangled polymer solutions. I. The Rouse model, Macromolecules 9(4) (1976) 587-593.
[26] P. De Gennes, Dynamics of entangled polymer solutions. II. Inclusion of hydrodynamic interactions, Macromolecules 9(4) (1976) 594-598.
[27] F. Brochard, P. De Gennes, Dynamical scaling for polymers in theta solvents, Macromolecules 10(5) (1977) 1157-1161.
[28] A. Onuki, Elastic effects in the phase transition of polymer solutions under shear flow, Physical review letters 62(21) (1989) 2472.
[29] A. Onuki, Phase transitions of fluids in shear flow, Journal of Physics: Condensed Matter 9(29) (1997) 6119.
[30] M. Doi, A. Onuki, Dynamic coupling between stress and composition in polymer solutions and blends, Journal de Physique II 2(8) (1992) 1631-1656.