Temperature‐induced phase transition of poly(N,N‐dimethylaminoethyl methacrylate‐co‐acrylamide)

Cho, Sun Hang; Jhon, Mu Shik; Yuk, Soon Hong; Lee, Hai Bang

doi:10.1002/(sici)1099-0488(199703)35:4<595::aid-polb7>3.3.co;2-o

Cited by 49 publications

(68 citation statements)

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“…The chain-solvent interaction is so weak under a strong basic condition (pH14) that the LCST occurs at a much lower temperature of 25℃. Decreasing pH to 10, the chain-solvent interaction changes markedly, so the LCST occurs at a higher temperature of 50℃, which agrees well with the previous experimental result [28] .…”

Section: Ph and Temperature Sensitivity Of Gold Nanoparticlesmentioning

confidence: 99%

Optic and catalytic properties of gold nanoparticles tuned by homopolymers

Chen¹,

Zhao

et al. 2009

Sci. China Ser. B-Chem.

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Gold nanoparticles (GNs) are prepared through in situ reduction using NaBH 4 in the presence of homopolymer PDMAEMA. The sizes of the GNs can be adjusted by alternating the molar ratio of gold to DMAEMA. Pure PDMAEMA aqueous solution shows a phase-transition at 50℃ at pH 10 and 25℃ at pH 14, while PDMAEMA-supported GNs aqueous solution shows a phase-transition at 47℃ at pH 10 because of the increasing hydrophobic property resulting from GNs. Due to the pH and temperature-responsible characteristics of PDMAEMA, the resulting PDMAEMA-supported GNs exhibit pH adjustable temperature-responsive characteristics in optic and catalytic aspects. Under an acidic condition (pH 2), the GNs show unchanged surface Plasmon absorbance with a peak of 518 nm in a temperature range from 20 to 65℃. Under a basic condition (pH 10), the GNs first show the same absorbance with a peak at 518 nm in a temperature range from 20 to 40℃, and then the absorbance red shifts from 518 to 545 nm as temperature increases from 40 to 65℃. When the GNs are used as catalysts to catalyze the reduction of p-nitrophenol, the catalytic activity can be adjusted by changing the permeation of reactants in the PDMAEMA layer at low and high temperatures, respectively. gold, nanoparticles, catalyst, homopolymer

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Section: Ph and Temperature Sensitivity Of Gold Nanoparticlesmentioning

confidence: 99%

Optic and catalytic properties of gold nanoparticles tuned by homopolymers

Chen¹,

Zhao

et al. 2009

Sci. China Ser. B-Chem.

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“…36°C). 8,9 Therefore, it was very sensitive to temperature changes. If the polymerization was fast, the released polymerization heat raised the solution temperature higher than the LCST of DMAEMA, so DMAEMA separated from the solution.…”

Section: Scheme 1 Molecular Structures Of the Initiators And Ligandsmentioning

confidence: 99%

“…Poly(DMAEMA) has a lower critical solution temperature (LCST), around 50°C. 8,9 DMAEMA has been polymerized via living anionic polymerization, 10 group transfer polymerization, 11 and ATRP [12][13][14] in various organic solvents. Nevertheless, the ATRP of DMAEMA in aqueous media remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

Atom transfer radical polymerization of 2-(dimethylamino)ethyl methacrylate in aqueous media

Zeng

Shen

Zhu

et al. 2000

J. Polym. Sci. A Polym. Chem.

103

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“…[1] Recent studies aim at designing an encapsulating agent because copolymers DMAEMA-co-acrylamide present a low critical solution temperature in water. [8,9] The most important application of cationic polymers is the flocculation of waste waters. Cationic charges along the polymer backbone create strong interactions with negatively charged particles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a New Macromonomer from 2‐(Dimethylamino)ethyl Methacrylate Bearing 1‐(Isopropenylphenyl)‐1,1‐dimethylmethyl Isocyanate Group

Boyer

Boutevin

Robin

et al. 2004

Macro Chemistry & Physics

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Summary: The telomerization of 2‐(dimethylamino)ethyl methacrylate (DMAEMA) with 2‐mercaptoethanol in acetonitrile shows that the telogen can react with the monomer by nucleophilic addition. It is to say that the tertiary amino group leads to nucleophilic addition rather than telomerization. The oligomers thus obtained were functionalized with 1‐(isopropenylphenyl)‐1,1‐dimethylmethyl isocyanate (TMI) in anhydrous toluene to afford macromonomers. These macromonomers were copolymerized with styrene and the r1, r2 ratio was determined according to Jaacks and Macret's methods. It was thereby demonstrated that the r1 value for this type of monomer is close to zero.Structure of the model molecule.magnified imageStructure of the model molecule.

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Temperature‐induced phase transition of poly(N,N‐dimethylaminoethyl methacrylate‐co‐acrylamide)

Cited by 49 publications

References 0 publications

Optic and catalytic properties of gold nanoparticles tuned by homopolymers

Optic and catalytic properties of gold nanoparticles tuned by homopolymers

Atom transfer radical polymerization of 2-(dimethylamino)ethyl methacrylate in aqueous media

Synthesis of a New Macromonomer from 2‐(Dimethylamino)ethyl Methacrylate Bearing 1‐(Isopropenylphenyl)‐1,1‐dimethylmethyl Isocyanate Group

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