Shear-Induced Phase Separation in Aqueous Polymer Solutions:  Temperature-Sensitive Microgels and Linear Polymer Chains

2003 ◽  
Vol 36 (23) ◽  
pp. 8811-8818 ◽  
Author(s):  
Markus Stieger ◽  
Walter Richtering
Keyword(s):  
Phase Separation ◽  
Polymer Solutions ◽  
Polymer Chains ◽  
Linear Polymer ◽  
Temperature Sensitive ◽  
Aqueous Polymer

scholarly journals Mechanical and Swelling Characteristics of Kappa-carrageenin/Poly-N-isopropylacrylamide Blend Hydrogels

2017 ◽  
Vol 4 (1) ◽  
pp. 61
Author(s):  
Zhang Yalong ◽  
Zhang Yanqun ◽  
Yi Min ◽  
Ha Hongfei
Keyword(s):  
Three Dimensional ◽  
Polymer Chains ◽  
Linear Polymer ◽  
Temperature Sensitive ◽  
Swelling Properties ◽  
Radiation Technology ◽  
Dimensional Network ◽  
Swelling Characteristics ◽  
Unreacted Monomer ◽  
Main Component

Two- or multi-component hydrogels consisting of the three-dimensional network of polymer chains play more and more significant role in the field of biomaterials such as contact lens, burn dressing drug delivery systems etc or in some technical fields such as gel actuators, sensors, absorbents etc. In the work, a novel blend hydrogel composed of kappa-carrageenin (KC) and polyisopropylacrylamide (PNIPAAm) was prepared via gamma-radiation technology at room temperature. The main component of the hydrogels is a typical temperature sensitive polymer PNIPAAm. As the second component, KC is a kind of natural macromolecules. The properties of the gels, such as gel strength, and swelling behavior were investigated. The incorporation of relatively small content (up to 5 wt.%) of KC could obviously improve the mechanical properties and swelling capacity. 3% KC content in the blend hydrogel is preferable for better strength and swelling properties. On the other hand, as a kind of polysaccharide, KC would be degraded by γ-rays; so<br />suitable dose must be controlled carefully. Here the total dose used was controlled below 3 kGy. KC is soluble in water. If the hydrogels synthesized in the work were as usually extracted in water or other polar solvent such as methanol, the KC in hydrogels would be also washed out completely together with unreacted monomer and linear polymer, and the action of KC in the blend hydrogels would be disappeared. Otherwise, the results published before showed that the unreacted monomer and linear polymer in the hydrogels were very small, no more than 3-5%, which would not affect the properties of the hydrogels.

NMR Study on Polymer-Solvent Interactions during Temperature-Induced Phase Separation in Aqueous Polymer Solutions

2007 ◽  
Vol 251 (1) ◽  
pp. 72-80 ◽  
Author(s):  
Jiří Spěváček ◽  
Lenka Hanyková
Keyword(s):  
Phase Separation ◽  
Polymer Solutions ◽  
Solvent Interactions ◽  
Aqueous Polymer ◽  
Nmr Study ◽  
Polymer Solvent

Novel porphyrin-labelled poly(N-isopropylacrylamides): syntheses from bromoalkyl-containing prepolymers and physicochemical properties

2000 ◽  
Vol 04 (06) ◽  
pp. 579-587 ◽  
Author(s):  
YURI S. AVLASEVICH ◽  
TIMOUR A. CHEVTCHOUK ◽  
VALERY N. KNYUKSHTO ◽  
OLEG G. KULINKOVICH ◽  
KONSTANTIN N. SOLOVYOV
Keyword(s):  
Phase Transition ◽  
Phase Separation ◽  
Physicochemical Properties ◽  
Absorption Spectra ◽  
Polymer Solutions ◽  
Soret Band ◽  
Water Soluble ◽  
Absorption Bands ◽  
Aqueous Polymer ◽  
Peak Intensity

Novel water-soluble tetraarylporphyrin-labelled polymers have been synthesized by the reaction of bromoalkyl-containing poly(N-isopropylacrylamides) with 5-(4-pyridyl)-10,15,20-tri(4-methoxyphenyl) porphyrin. Corresponding Zn -porphyrin-containing polymers have also been prepared. Phase transition diagrams show that aqueous polymer solutions exhibit phase separation upon heating. Absorption spectra of the porphyrin-labelled polymers have been recorded in water and organic solvents. It is found that the absorption bands in aqueous polymer solutions are broadened and shifted bathochromically, the peak intensity of the Soret band in the polymer spectra being strongly lowered in water. Fluorescence properties of the polymers are briefly reported.

Effect of time on the hydration and temperature-induced phase separation in aqueous polymer solutions. 1H NMR study

Polymer ◽  
2006 ◽  
Vol 47 (21) ◽  
pp. 7329-7334 ◽  
Author(s):  
Larisa Starovoytova ◽  
Jiří Spěváček
Keyword(s):  
Phase Separation ◽  
1H Nmr ◽  
Polymer Solutions ◽  
Aqueous Polymer ◽  
Nmr Study

Phase Separation in Aqueous Polymer Solutions as Studied by NMR Methods

2005 ◽  
Vol 222 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Ji?� Sp?v�?ek
Keyword(s):  
Phase Separation ◽  
Polymer Solutions ◽  
Aqueous Polymer ◽  
Nmr Methods

Chemiluminescent self-reported unfolding of single-chain nanoparticles

2021 ◽  
Author(s):  
Fabian R. Bloesser ◽  
Sarah L. Walden ◽  
Ishrath M. Irshadeen ◽  
Lewis C. Chambers ◽  
Christopher Barner-Kowollik
Keyword(s):  
Polymer Chains ◽  
Linear Polymer ◽  
Single Chain

We demonstrate the light-induced, crosslinker mediated collapse of linear polymer chains into single-chain nanoparticles (SCNPs) capable of self-reporting their unfolding.

scholarly journals Viscoelastic phase separation model for ternary polymer solutions

2021 ◽  
Vol 154 (10) ◽  
pp. 104903
Author(s):  
Kenji Yoshimoto ◽  
Takashi Taniguchi
Keyword(s):  
Phase Separation ◽  
Polymer Solutions ◽  
Ternary Polymer ◽  
Separation Model

Influence of the temperature on the rheological properties of bentonite suspensions in aqueous polymer solutions

2016 ◽  
Vol 123 ◽  
pp. 92-98 ◽  
Author(s):  
K. Ben Azouz ◽  
K. Bekkour ◽  
D. Dupuis
Keyword(s):  
Rheological Properties ◽  
Polymer Solutions ◽  
Aqueous Polymer
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