Determination of microstructure of hydrophobically modified water-soluble polymers by 13C n.m.r.

Magny, Benoît; Lafuma, F.; Iliopoulos, Ilias

doi:10.1016/0032-3861(92)90227-n

Cited by 73 publications

(50 citation statements)

References 14 publications

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“…The hydrophobic groups are n-octadecyl acrylamide (ODAm) units randomly distributed along the hydrophilic PAA backbone. The degree of hydrophobic modification (i.e., the ratio of ODAm to PAA + ODAm) was determined using NMR spectroscopy [29].…”

Section: Methodsmentioning

confidence: 99%

Pseudobilayer Vesicle Formation via Layer-by-Layer Assembly of Hydrophobically Modified Polymers on Sacrificial Substrates

Khopade¹,

Möhwald²

2005

Adv. Funct. Mater.

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A bilayer of a hydrophobically modified polyelectrolyte, octadecyl poly(acrylamide) (PAAm), sandwiched between the layers of a hydrophilic polyelectrolyte, poly(ethyleneimine) (PEI), is prepared by the sequential electrostatic–hydrophobic–electrostatic‐interaction‐driven self‐assembly on planar and colloid substrates. This process results in a PEI/[PAAm]2/PEI‐multilayer‐coated substrate. The removal of a PAA/PEI/[PAAm]2/PEI‐multilayer‐coated decomposable colloidal template produces hollow capsules. Irregular hydrophobic domains of the [PAAm]2 bilayer in the PEI/[PAAm]2/PEI‐multilayer capsule are infiltrated with a lipid to obtain a uniform, distinct hydrophobic layer, imparting the capsule with a pseudobilayer vesicle structure.

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Section: Methodsmentioning

confidence: 99%

Pseudobilayer Vesicle Formation via Layer-by-Layer Assembly of Hydrophobically Modified Polymers on Sacrificial Substrates

Khopade¹,

Möhwald²

2005

Adv. Funct. Mater.

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“…The degree of hydrophobic modifications were checked by NMR (11). From these measurements it is known that the hydrophobic modifications are randomly distributed along the hydrophilic backbone (11). It should be realized that samples prepared in this way will possess a certain heterogeneity both with respect to chain length (polydispersity in molar mass) and with respect to the degree of modification.…”

Section: Polymer Samplesmentioning

confidence: 99%

“…1) of the carboxylic groups are converted into dodecyl-acrylamide groups. The degree of hydrophobic modifications were checked by NMR (11). From these measurements it is known that the hydrophobic modifications are randomly distributed along the hydrophilic backbone (11).…”

Section: Polymer Samplesmentioning

confidence: 99%

Adsorption of Hydrophobically Modified Polyacrylic Acid on a Hydrophobic Surface: Hysteresis Caused by an Electrostatic Adsorption Barrier

Göbel

Besseling

Stuart

et al. 1999

Journal of Colloid and Interface Science

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The adsorption of hydrophobically modified polyacrylic acid (HM-PAAc) has been compared to the adsorption of unmodified polymers by means of reflectometry. The polymers were adsorbed onto a noncharged hydrophobic polystyrene surface. The adsorption kinetics of both types of polymer is the same until a certain surface coverage. Then the unmodified sample shows a saturation while the hydrophobically modified polyacrylic acid continues to adsorb. The adsorption behavior of the polyelectrolyte can be controlled by the pH and the ionic strength of the solution. For ionic strengths of 0.001 M NaCl the hydrophobically modified polymer shows a larger adsorbed amount at pH 3 to 4 compared to the unmodified polymer. At pH higher than 4 the differences are less significant. At higher ionic strength the amount of adsorbed material increases for both polymers. While doing adsorption-desorption cycles a hysteresis-effect was detected. At the same pH the hydrophobically modified polymer sticks to the surface while the unmodified polymer is already desorbing completely. The hysteresis vanishes when the ionic strength of the solution is increased. Copyright 1999 Academic Press.

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“…Studies on hydrophobically-associating water-soluble polymers have been, so far, mainly performed on the modification of maleic anhydride [1] or polyacrylic acid under various hydrophilic forms [2,3,4] (sodium acrylate, N-isopropyl acrylamide, etc.) as well as, to a lesser extent, on hydrophobic derivatives of certain polysaccharides [5,6,7] (hydroxyethyl cellulose, pullulan, etc.…”

Section: Rheological Study Of Aqueous Solutions Of Hydrophobically-asmentioning

confidence: 99%

Rheological Study of Aqueous Solutions of Hydrophobically-Associating Derivatives of Propylene Glycol Alginate (Pga)

Page

Hubert

Choplin

et al. 1997

Rev. Inst. Fr. Pét.

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Determination of microstructure of hydrophobically modified water-soluble polymers by 13C n.m.r.

Cited by 73 publications

References 14 publications

Pseudobilayer Vesicle Formation via Layer-by-Layer Assembly of Hydrophobically Modified Polymers on Sacrificial Substrates

Pseudobilayer Vesicle Formation via Layer-by-Layer Assembly of Hydrophobically Modified Polymers on Sacrificial Substrates

Adsorption of Hydrophobically Modified Polyacrylic Acid on a Hydrophobic Surface: Hysteresis Caused by an Electrostatic Adsorption Barrier

Rheological Study of Aqueous Solutions of Hydrophobically-Associating Derivatives of Propylene Glycol Alginate (Pga)

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