Thermosensitive copolymers having soluble and insoluble monomer units, poly(<i>N</i>‐vinylacetamide‐<i>co</i>‐methyl acrylate)s: Effect of additives on their lower critical solution temperatures

Mori, Takeshi; Fukuda, Y.; Okamura, Hirokazu; Minagawa, Keiji; Masuda, Seizo; Tanaka, Masami

doi:10.1002/pola.20123

Cited by 24 publications

(25 citation statements)

References 35 publications

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“…The LCST decreased in most cases with increasing amounts of organic solvent, or a combined LCST and upper critical solution temperature (UCST) behavior was found. The dependence of the cosolvent effect on the structure of the LCST polymer has been demonstrated by Mori et al 39 In contrast to pNIPAM, poly(N-vinylacetamide-co-methyl acrylate) shows increasing LCST values with increasing amounts of lower alcohols except n-butanol. The drawbacks of these materials are low phase transition temperatures (Ͻ50°C) and rather low contents of cosolvents at useful switching temperatures.…”

Section: Resultsmentioning

confidence: 88%

“…Up to now, only a few groups have conducted detailed studies of the effect of additives (salt, organic solvents) on the thermal behavior of LCST materials, 38,39 especially pNIPAM derivatives. In this article we report on the synthesis of new polymeric gel particles using a condensation product of MA/poly(ethylene glycol) (MA/PEG) as crosslinkable macromonomers and acrylamides as comonomers.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and properties of new thermosensitive polymer systems

Bohrisch

Hahn

Maedler

et al. 2007

J of Applied Polymer Sci

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The controlled thermal release of aqueous solvent mixtures from polymeric gel particles was investigated. A new type of a polymeric gel consisting of a maleic anhydride/poly(ethylene glycol) condensation product as a crosslinking macromonomer and acrylamides was synthesized by solution or inverse emulsion polymerization for the investigation. Afterward a shell of crosslinked polystyrene was coated to stabilize this new kind of "microcontainer" for the application. This concept was shown as generally useful for various mixtures of organic solvents and water. The cloud point temperature of the polymer gel strongly depended on the following parameters: the type and content of organic cosolvent, the degree of polymerization and constituents of the polyester moiety, and the type and content of the comonomers

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Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of new thermosensitive polymer systems

Bohrisch

Hahn

Maedler

et al. 2007

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…This broad transition most likely results from the chainchain heterogeneity in copolymer composition. [25] When the solution concentration was decreased from 1.0 wt.-% to 0.1 wt.-%, the decay rate observed by DLS increased as a function of temperature (D H ¼ 47 nm at 55 8C), suggesting intramolecular collapse as the operative size-determining phenomenon.…”

Section: Brush Copolymer Solution Propertiesmentioning

confidence: 99%

Solution Behavior of Temperature‐Responsive Molecular Brushes Prepared by ATRP

Pietrasik

Sumerlin

Lee

et al. 2007

Macro Chemistry & Physics

106

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Molecular brushes, with side chains consisting of two copolymers: 2‐(dimethylamino)ethyl methacrylate with methyl methacrylate, and N,N‐dimethylacrylamide with butyl acrylate were prepared by grafting‐from via atom transfer radical polymerization (ATRP). Poly(2‐(2‐bromoisobutyryloxy)ethyl methacrylate) and poly(2‐(2‐bromopropionyloxy)ethyl methacrylate) were used as macroinitiators. Dynamic light scattering (DLS) studies were performed for aqueous solutions of molecular brushes below and above the lower critical solution temperature (LCST), and an unusual concentration‐dependent LCST was observed. Due to the compact structure of molecular brushes, intramolecular collapse can occur when the average distance between molecules is much larger than the hydrodynamic dimensions of the individual macromolecules. However, if the concentration of the solution of molecular brushes is increased to the level in which the separation distance is comparable with the brush hydrodynamic dimensions, intermolecular aggregation occurs, as typically observed for solutions of linear polymers.magnified image

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“…However, the homopolymers poly(AcrNMP) and poly(AcrNEP) were soluble in water, and no LCST behaviour was observed. New thermosensitive polymers were also synthesised by Mori et al [15] by free-radical copolymerisation of N-vinylacetamide (NVA) and methyl acrylate, whose homopolymers are soluble and insoluble in water, respectively. The LCST of the obtained copolymers ranged between 59 and 83 8C, and it increased with increasing NVA content.…”

Section: Introductionmentioning

confidence: 99%

Temperature‐Responsive Water‐Soluble Copolymers Based on 2‐Hydroxyethyl Acrylate and Butyl Acrylate

Mun¹,

Nurkeeva²,

Beissegul³

et al. 2007

Macro Chemistry & Physics

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Amphiphilic copolymers have been synthesised by free radical copolymerisation of 2‐hydroxyethyl acrylate with butyl acrylate, the reactivity ratios of which indicate practically equal reactivity. The copolymers containing less than 30 mol‐% of BA were soluble in water and exhibited a LCST in aqueous solutions. It was found that the interaction between these copolymers and poly(acrylic acid) in aqueous solutions resulted in the formation of interpolymer complexes stabilised by hydrogen bonds and hydrophobic interactions. This interaction was significantly affected by solution pH and led to modification of the temperature‐responsive behaviour of the copolymers.magnified image

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Thermosensitive copolymers having soluble and insoluble monomer units, poly(N‐vinylacetamide‐co‐methyl acrylate)s: Effect of additives on their lower critical solution temperatures

Cited by 24 publications

References 35 publications

Synthesis and properties of new thermosensitive polymer systems

Synthesis and properties of new thermosensitive polymer systems

Solution Behavior of Temperature‐Responsive Molecular Brushes Prepared by ATRP

Temperature‐Responsive Water‐Soluble Copolymers Based on 2‐Hydroxyethyl Acrylate and Butyl Acrylate

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