Thermotropic aqueous gels and solutions of N,N-dimethylacrylamide-acrylate copolymers

Mueller, Karl F.

doi:10.1016/0032-3861(92)91105-b

Cited by 76 publications

(52 citation statements)

References 10 publications

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“…Copolymerization of hydrophilic and hydrophobic monomers allow fine tuning of the LCST. [19] In this study temperature-responsive brushes with tunable LCST were prepared by statistical copolymerization of DMAEMA with methyl methacrylate (MMA) and DMA with butyl acrylate (BA) from a macroinitiator backbone. The solution behavior of these responsive brushes was studied by dynamic light scattering (DLS) at higher (1 wt.-%) and lower (0.1 wt.-%) concentrations.…”

Section: Full Papermentioning

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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Section: Full Papermentioning

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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“…Figure 3 shows the comparison of swelling data for NIPA homopolymer gel particles in water with calculated curve from eqs. (10)(11)(12). Obtained adjustable model parameters for NIPA homopolymer gel particles in water are d 0,AC Å 14.228, d 1,AC Å 04377.9 (K), b AC Å 0.7502, and F 0 Å 0.7961.…”

Section: Resultsmentioning

confidence: 99%

Swelling behavior of thermosensitiveN-isopropylacrylamide-ethylN-acryloylglycine submicron-sized copolymer gel particles

Choi

Kim

Lee

et al. 1998

J. Appl. Polym. Sci.

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Submicron-sized N-isopropylacrylamide (NIPA) -ethyl N-acryloylglycine (ENAG) copolymer gel particles with various compositions were prepared by precipitation polymerization in water. Their swelling behaviors were determined by photon correlation spectroscopy (PCS). Our results showed that the volume transition temperature of copolymer gel particles decreased with increasing the mole ratio of ENAG. In model development, we modified the extended Flory-Huggins theory as a free energy of mixing term and employed the modified Flory-Rehner theory for the elastic contribution and compared the proposed model with our swelling data. The model predicted fairly well the swelling behaviors of copolymer gel particles.

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“…LCST was thus clearly influenced by residual lignin content. This was attributed to the hydrophobicity of lignin, based on previous findings (Priest et al 1987;Mueller 1992;Chee et al 2001).…”

Section: Lcst Of Hpc-lmentioning

confidence: 95%

Body temperature-responsive gels derived from hydroxypropylcellulose bearing lignin II: adsorption and release behavior

et al. 2006

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The lower critical solution temperature (LCST) of hydroxypropylcellulose bearing lignin (HPC-L) prepared from unbleached pulp depends on the amount of residual lignin. An HPC-L gel having thermal properties reflective of original HPC-L was prepared using ethyleneglycol diglycidylether as a crosslinker, as previously reported [Uraki et al. (2004) Carbohydr. Polym. 58:123 -130], and the volume transition temperature was detected as an endothermic peak by differential scanning calorimetry (DSC). The adsorption and release behavior of the guest molecules to/from this gel was then examined. When the adsorption of cationic and anionic guests was compared, cationic methylene blue (MB) was adsorbed in larger amounts than anionic methyl orange (MO). In addition, MB adsorption into the HPC-L gel was greater than MB adsorption into the HPC gel prepared from commercially available HPC. This suggests that residual lignin affects the adsorption of organic dyes. Significant differences were not observed with respect to the release of MB from HPC-L at 38°C and lower temperatures. In the adsorption of surfactants, marked adsorption at around the critical micelle concentration of the ionic surfactants and gel swelling were observed. Such swelling did not occur in the aqueous nonionic surfactant solution, although the nonionic surfactant was adsorbed into the gel. Gel swelling may have been caused by the electrostatic repulsion of the ionic surfactants adsorbed onto the polymer chains within the gel structure.

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Thermotropic aqueous gels and solutions of N,N-dimethylacrylamide-acrylate copolymers

Cited by 76 publications

References 10 publications

Solution Behavior of Temperature‐Responsive Molecular Brushes Prepared by ATRP

Solution Behavior of Temperature‐Responsive Molecular Brushes Prepared by ATRP

Swelling behavior of thermosensitiveN-isopropylacrylamide-ethylN-acryloylglycine submicron-sized copolymer gel particles

Body temperature-responsive gels derived from hydroxypropylcellulose bearing lignin II: adsorption and release behavior

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