[19] Rotating cylinder viscometers

Uhlenhopp, Elliott L.; Zimm, Bruno H.

doi:10.1016/s0076-6879(73)27022-2

Cited by 8 publications

(1 citation statement)

References 45 publications

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“…Viscosity of aqueous solutions of the NIPAM‐ b ‐SSS copolymers in the pre‐ and post‐transition conformational states was measured with an automatic Zimm viscometer AV‐1 (NPO “Biopribor”, Pushchino, Russia) at an average shear gradient of 0.75 s −1 . The instrument was calibrated by deionized water and two standard liquids RT 5 and RT 10 (Cannon Instrument Company, USA) with the viscosity values of 4.513 and 9.109 cP, respectively.…”

Section: Methodsmentioning

confidence: 99%

Energetics and Mechanism of Conformational Transitions of Protein‐Like NIPAM‐Sodium Styrene Sulfonate Copolymers in Aqueous Solutions

Grinberg

Burova

Grinberg

et al. 2015

Macro Chemistry & Physics

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Protein‐like and random NIPAM‐sodium styrene sulfonate copolymers of similar composition have been prepared by radical polymerization in water at temperatures above and below the LCST of PNIPAM, respectively. Thermal transitions of the copolymers in aqueous solutions have been studied by means of dynamic light scattering, viscometry, and high‐sensitivity differential scanning calorimetry. The phase separation or cooperative conformational transitions without phase separation were observed for the random or the protein‐like copolymers, respectively. Transition temperature, enthalpy, and heat capacity increment of the protein‐like copolymer differed insignificantly from those of the random copolymer of similar composition. The transition heat capacity increments of the protein‐like copolymers revealed that only 10–20% of their NIPAM links participate in the formation of a dense water‐free globule core. The coil–globule transitions of the protein‐like copolymers were described by the thermodynamic three‐state model according to the scheme “random coil↔condensed coil↔globule”, which is known to simulate the folding mechanism of globular proteins.

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Section: Methodsmentioning

confidence: 99%