Rheological properties of physical gel formed by hydrophobically modified urethane ethoxylate (HEUR) associative polymers in methanol–water mixtures

AbstractThe synthesis, characterization and rheological properties in aqueous solutions of water-soluble associative polymers (AP’s) are reported. Polymer chains consisting of water-soluble polyacrylamides, hydrophobically modified with low amounts of N,N-dihexylacrylamide (1, 2, 3 and 4 mol%) were prepared via free radical micellar polymerization. The properties of these polymers, with respect to the concentration of hydrophobic groups, using steady-flow and oscillatory experiments were compared. An increase of relaxation time (TR) and modulus plateau (G0) was observed in all samples studied. Two different regimes can be clearly distinguished: a first unentangled regime where the viscosity increase rate strongly depends on hydrophobic content and a second entangled regime where the viscosity follows a scaling behavior of the polymer concentration with an exponent close to 4.

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Experimental Study of Rheological Properties and Oil Displacement Efficiency in Oilfields for a Synthetic Hydrophobically Modified Polymer

Scientific Reports ◽

10.1038/s41598-017-09057-9 ◽

2017 ◽

Vol 7 (1) ◽

Cited By ~ 5

Author(s):

Pengcheng Liu ◽

Zhenbao Mu ◽

Chao Wang ◽

Yanling Wang

Keyword(s):

Experimental Study ◽

Rheological Properties ◽

Displacement Efficiency ◽

Oil Displacement ◽

Modified Polymer ◽

Hydrophobically Modified Polymer ◽

Hydrophobically Modified ◽

Oil Displacement Efficiency

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Solution rheology of hydrophobically modified associative polymers: Effects of backbone composition and hydrophobe concentration

Journal of Rheology ◽

10.1122/1.1773781 ◽

2004 ◽

Vol 48 (5) ◽

pp. 979-994 ◽

Cited By ~ 31

Author(s):

Ahmed A. Abdala ◽

Wenjun Wu ◽

Keith R. Olesen ◽

Richard D. Jenkins ◽

Alan E. Tonelli ◽

...

Keyword(s):

Associative Polymers ◽

Hydrophobically Modified ◽

Solution Rheology

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Physical Principles Underlying the Complex Biology of Intracellular Phase Transitions

Annual Review of Biophysics ◽

10.1146/annurev-biophys-121219-081629 ◽

2020 ◽

Vol 49 (1) ◽

pp. 107-133 ◽

Cited By ~ 74

Author(s):

Jeong-Mo Choi ◽

Alex S. Holehouse ◽

Rohit V. Pappu

Keyword(s):

Phase Transitions ◽

Rheological Properties ◽

Recent Work ◽

Driving Forces ◽

Rna Molecules ◽

Associative Polymers ◽

Different Types ◽

Condensate Formation ◽

The Impact ◽

Physical Principles

Many biomolecular condensates appear to form via spontaneous or driven processes that have the hallmarks of intracellular phase transitions. This suggests that a common underlying physical framework might govern the formation of functionally and compositionally unrelated biomolecular condensates. In this review, we summarize recent work that leverages a stickers-and-spacers framework adapted from the field of associative polymers for understanding how multivalent protein and RNA molecules drive phase transitions that give rise to biomolecular condensates. We discuss how the valence of stickers impacts the driving forces for condensate formation and elaborate on how stickers can be distinguished from spacers in different contexts. We touch on the impact of sticker- and spacer-mediated interactions on the rheological properties of condensates and show how the model can be mapped to known drivers of different types of biomolecular condensates.

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