Synthesis and characterization of highly crosslinked poly(acrylamides) and poly(methacrylamides). A new class of macroporous polyamides

Shea, Kenneth J.; Stoddard, G. J.; Shavelle, D. M.; Wakui, Futao; Choate, R. M.

doi:10.1021/ma00223a001

Cited by 115 publications

(97 citation statements)

References 9 publications

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“…Moreover, at a higher weight percentage loading of clay, the intermolecular hydrogen bonding and PMAm chain degradation were stabilized because of the crosslinking nature of the PMAm gel. 1 This showed that the PMAm-clay nanocomposite system was a thermally stable material. The data are mentioned in Table II.…”

Section: Tga For the Pmam-clay Nanocompositesmentioning

confidence: 94%

“…The synthesis and characterization of highly crosslinked polyacrylamides and polymethacrylamide (PMAm) were reported. 1 Misra and Dubey 2 studied the redox-initiated aqueous polymerization of methacrylamide (MAm). A report on the crystal structure effect in the radiation-induced solid-state polymerization of MAm is available in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of Polymethacrylamide–Clay nanocomposites

Anbarasan¹,

Arvind²,

Dhanalakshmi³

2011

J of Applied Polymer Sci

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Polymethacrylamide intercalated hectorite clay nanocomposites were synthesized by the in situ free-radical polymerization method. The interlayer cation of hectorite clay was modified with cetyl pyridinium chloride and cetrimide, and their effects on the rate of polymerization of methacrylamide and the structureproperty relationships of the resulting polymer nanocomposites were investigated. Fourier transform infrared spectroscopy showed a peak around 550 cm À1 that was due to the metal oxide stretching of hectorite clay in the polymer nanocomposites. High-resolution transmission electron microscopy determined the size of polymethacrylamide as 300 nm. X-ray diffraction was used for the determination of the intercalated products.

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Section: Tga For the Pmam-clay Nanocompositesmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Polymethacrylamide–Clay nanocomposites

Anbarasan¹,

Arvind²,

Dhanalakshmi³

2011

J of Applied Polymer Sci

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“…17 b The value of ET of the gels below pH 3.8 is 30 kcal mol -1 from the A 1 = 460 nm for dansyl probe, 14 a which corresponds to the dry polymer regime. 20 Over pH 3.8, ET for the gels becomes 52 kcal mo1-1 , while for all pH region the ET for the linear polymer is 52 kcal mo! -1 based on ),r of the dansyl probe.…”

Section: Photophysical Properties Of Pyrenyl Probe In the Gel And Thementioning

confidence: 97%

“…In this state, the pyrenyl and dansyl probes are located completely in a hydrophobic micro-environment inside the gel which corresponds to the dry polymer regime. 20 A decrease in the proton concentration causes the transformation from -COOH to -coo-in the region of pH 3.8 to 5.0. This results in the fluorescence shift of dansyl and pyrenyl probes to the red side due to increase in micro-polarity inside the gel.…”

Section: Photophysical Properties Of Pyrenyl Probe In the Gel And Thementioning

confidence: 99%

Change in Micro-Environments in Poly(acrylamide) Gel with Pyrenyl Probe Due to Its Volume Phase Transition Induced by pH Change

Horie

Torii

et al. 1993

Polym J

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ABSTRACT:Changes in the micro-environments and interactions among the side groups during pH-induced volume phase transition of poly(acrylamide) gels having pyrenyl group as a fluorescent probe in acetone-water (9: 11) mixed solvent were studied with fluorescence spectra and lifetime measurements. The results are as follows: (a) The volume phase transition is caused by hydrophobic interaction of polymer main chains and charge repulsive force of carboxylate anion at polymer side chains inside the gel, indicated by change in fluorescence intensity ratio Ii/ 13 of the pyrenyl probe and the shifts in fluorescence wavelength. (b) In the collapsed state, the gel consists of two phases: one is the portion of polymer main chain aggregate, and the other is the portion of polar side group assembly, which results from a competitive interaction between the hydrophobic interaction of polymer main chains and the charge repulsive force of carboxylate anion in the coexisting two phase regime.KEY WORDS Poly(acrylamide) Gel / Volume Phase Transition / Fluorescence / Pyrenyl Group / Hydrogen Bond / Hydrophobic Interaction / Some organic polymer hydrogels have widespread applications in medical, pharmaceutical, industrial, and related fields. 1 These hydrogels made of, e.g., poly(acrylamide) (PAAm) or poly(isopropylacrylamide) (PNIPA) show volume phase transition with a reversible volume change of as large as several hundred times induced by various conditions. 1 -6 Some macroscopic properties of gels, such as mechanical 7 and thermal 8 behavior have been widely investigated during the volume phase transition. The processes of swelling and shrinking of the PAAm or PNIPA gel were measured with light scattering 9 • 10 to monitor the density fluctuation of gel networks near the volume phase transition. It has been noted recently that detailed chemical structure, conformational change, interactions among the polymer chains and between the polymer chain and solvent molecules, and micro-environments inside the gels play very inportant roles in determining the volume phase transition. Though the light scattering study reveals the microscopic structure and dynamics of gel network for the volume phase transition, 1 o, 11 NMR can also demonstrate the changes in the micro-environments and motions of the side groups and backbone polymer chains of PNIPA during the volume phase transition. 12 Fluorescence technique can give information

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“…This is feasible in the case of a hydrolyzable ester (such as 4, Table 1), [31] amide, or imine bond, [32] where subsequent rebinding can take place by electrostatic interactions between the respective amine and carboxylic acid. After disappointing results in terms of template removal, binding capacity, and selectivity, this approach has not been pursued further.…”

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confidence: 99%

Imprinted Polymers with Memory for Small Molecules, Proteins, or Crystals

Sellergren

2000

Angew. Chem. Int. Ed.

235

107

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The simple and appealing concept of using templates—small molecules, proteins, or crystals—to synthesize polymers with a structure complementary to the template structure has attracted chemists from several disciplines for more than 50 years. This highlight summarizes some of the most promising recent developments for the generation of templated binding sites and discusses potential applications.

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Synthesis and characterization of highly crosslinked poly(acrylamides) and poly(methacrylamides). A new class of macroporous polyamides

Cited by 115 publications

References 9 publications

Synthesis and characterization of Polymethacrylamide–Clay nanocomposites

Synthesis and characterization of Polymethacrylamide–Clay nanocomposites

Change in Micro-Environments in Poly(acrylamide) Gel with Pyrenyl Probe Due to Its Volume Phase Transition Induced by pH Change

Imprinted Polymers with Memory for Small Molecules, Proteins, or Crystals

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