Results 141 to 150 of about 8,204 (174)
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Journal of Biomaterials Science, Polymer Edition, 1994
We have been studying adsorption and retention (resistance to desorption) behavior of temperature sensitive LCST polymers on different substrates as a function of temperature. According to our studies with Poly 64 (a copolymer of 60% (mol) NIPAAm and 40% (mol) NnBAAm, LCST = 8.5 degrees C in water), the copolymer retention depends on the rinse ...
M, Miura +3 more
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We have been studying adsorption and retention (resistance to desorption) behavior of temperature sensitive LCST polymers on different substrates as a function of temperature. According to our studies with Poly 64 (a copolymer of 60% (mol) NIPAAm and 40% (mol) NnBAAm, LCST = 8.5 degrees C in water), the copolymer retention depends on the rinse ...
M, Miura +3 more
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Journal of Polymer Science Part B: Polymer Physics, 1992
AbstractThe molecular weight distribution (MWD) of high‐molecular‐weight isotactic polypropylene is measured by a new method developed for polyethylene (PE) using the turbidity at the lower critical solution temperature (LCST). The attenuation of transmitted light hi is measured at Ti as each fraction i is separated from the solution during a ...
Takouhi Bohossian, Geneviève Delmas
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AbstractThe molecular weight distribution (MWD) of high‐molecular‐weight isotactic polypropylene is measured by a new method developed for polyethylene (PE) using the turbidity at the lower critical solution temperature (LCST). The attenuation of transmitted light hi is measured at Ti as each fraction i is separated from the solution during a ...
Takouhi Bohossian, Geneviève Delmas
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Lower Critical Solution Temperature (LCST) Phase Behavior of Poly(ethylene oxide) in Ionic Liquids
The Journal of Physical Chemistry Letters, 2010We describe the LCST-type phase behavior of poly(ethylene oxide) (PEO) (M = 5000 and 20000) dissolved in 1,3-dialkylimidazolium tetrafluoroborate ionic liquids. The phase transition temperatures were identified using cloud point measurements. In these PEO/ionic liquid systems, liquid−liquid phase separation is observed in the temperature range from 130
Hau-Nan Lee, Timothy P. Lodge
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Polymer Engineering & Science, 1985
AbstractA lower critical solution temperature (LCST) phase split can be used as an alternative to steam stripping for separating polymer solutions, By adding a supercritical fluid (SCF) additive to the polymer solution, the LCST can be lowered, thus minimizing the possibility of polymer degradation and also reducing the thermal energy requirements for ...
Alan K. McClellan, Mark A. McHugh
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AbstractA lower critical solution temperature (LCST) phase split can be used as an alternative to steam stripping for separating polymer solutions, By adding a supercritical fluid (SCF) additive to the polymer solution, the LCST can be lowered, thus minimizing the possibility of polymer degradation and also reducing the thermal energy requirements for ...
Alan K. McClellan, Mark A. McHugh
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Physical Chemistry Chemical Physics, 2013
Abrupt changes in effective concentration and osmotic pressure of lower critical solution temperature (LCST) mixtures facilitate the design of a continuous desalination method driven by a mild temperature gradient. We propose a prototype desalination system by circulating LCST mixtures between low and high temperature (low T and high T) units.
Yeongbong, Mok +5 more
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Abrupt changes in effective concentration and osmotic pressure of lower critical solution temperature (LCST) mixtures facilitate the design of a continuous desalination method driven by a mild temperature gradient. We propose a prototype desalination system by circulating LCST mixtures between low and high temperature (low T and high T) units.
Yeongbong, Mok +5 more
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Journal of Applied Polymer Science, 1992
AbstractThe composition and molecular weight distribution of linear low‐density polyethylenes (LLDPE) have been determined by fractionation and characterization at a lower critical solution temperature (LCST). The fractionation in 2,4‐dimethyl pentane takes advantage of the fact that the LCST is sensitive to the side‐group content as indicated by the ...
Alla Barbalata +2 more
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AbstractThe composition and molecular weight distribution of linear low‐density polyethylenes (LLDPE) have been determined by fractionation and characterization at a lower critical solution temperature (LCST). The fractionation in 2,4‐dimethyl pentane takes advantage of the fact that the LCST is sensitive to the side‐group content as indicated by the ...
Alla Barbalata +2 more
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Journal of Macromolecular Science, Part B, 2011
Temperature-responsive hydrogel with a lower critical solution temperature (LCST) close to human body temperature was prepared. Crosslinked N-isopropylacrylamide (NIPAAm) and acrylic acid (AAc) copolymer networks were synthesized at various monomer ratios in the presence of ammonium persulfate (APS), N,N′-methylenebisacrylamide (NMBA) and N,N,N′,N ...
Shingjiang Jessie Lue +2 more
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Temperature-responsive hydrogel with a lower critical solution temperature (LCST) close to human body temperature was prepared. Crosslinked N-isopropylacrylamide (NIPAAm) and acrylic acid (AAc) copolymer networks were synthesized at various monomer ratios in the presence of ammonium persulfate (APS), N,N′-methylenebisacrylamide (NMBA) and N,N,N′,N ...
Shingjiang Jessie Lue +2 more
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Colloid & Polymer Science, 1988
Cloud points of aqueous solutions of homogeneous poly(oxyethylene)dodecyl ether derivatives (C12(OE)n: n=2–8) and the apparent theta temperatureTθ ap were determined from the abrupt changes in optical transmittance and the temperature dependence of the second virial coefficient obtained by light scattering ...
H. Fujimatsu, S. Ogasawara, S. Kuroiwa
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Cloud points of aqueous solutions of homogeneous poly(oxyethylene)dodecyl ether derivatives (C12(OE)n: n=2–8) and the apparent theta temperatureTθ ap were determined from the abrupt changes in optical transmittance and the temperature dependence of the second virial coefficient obtained by light scattering ...
H. Fujimatsu, S. Ogasawara, S. Kuroiwa
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Polymers for Advanced Technologies, 1996
A series of vinyl polymers with L-valine and L-leucine residues, and related copolymers with N-isopropylacrylamide, were studied in aqueous solution at different temperatures (25, 30 and 35°C) and at two ionic strengths (0.01 M and 0.1 M NaCl). The protonation behavior revealed great differences between the polymers that were attributed to the size of ...
Casolaro, Mario, Barbucci, R.
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A series of vinyl polymers with L-valine and L-leucine residues, and related copolymers with N-isopropylacrylamide, were studied in aqueous solution at different temperatures (25, 30 and 35°C) and at two ionic strengths (0.01 M and 0.1 M NaCl). The protonation behavior revealed great differences between the polymers that were attributed to the size of ...
Casolaro, Mario, Barbucci, R.
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