Size exclusion chromatography of polyelectrolytes with aqueous elution solvents

Bruessau, Rudolf

doi:10.1002/masy.19920610116

Cited by 9 publications

(4 citation statements)

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“…In summary, when the molar masses of [Ph(CH 2 ) 4 NH–BH 2 ] n obtained by different analytical techniques GPC, DLS, and DOSY NMR are compared, our results indicate that the molar mass determination by GPC in THF-based media using styragel columns is substantially overestimated by an order of magnitude. The possibility that GPC overestimates the molar mass has been previously suggested for polyaminoboranes. , Overestimation of the molar mass by GPC has been observed under similar conditions for polar polymers such as poly(2-vinylpyridine) in THF due to the repulsive interactions between the polymer chains and nonpolar styragel columns which lead to enhanced exclusion and faster elution than anticipated . Similar observations have been made for the typical polyelectrolyte sodium poly(styrenesulfonate) in aqueous media .…”

Section: Resultssupporting

confidence: 72%

“…42,49 Overestimation of the molar mass by GPC has been observed under similar conditions for polar polymers such as poly(2vinylpyridine) 74 in THF due to the repulsive interactions between the polymer chains and nonpolar styragel columns which lead to enhanced exclusion and faster elution than anticipated. 75 Similar observations have been made for the typical polyelectrolyte sodium poly(styrenesulfonate) in aqueous media. 76 A similar exclusion effect may therefore operate in the GPC analysis of polyaminoboranes due to their polar nature.…”

Section: Characterization Of Polyaminoboranesupporting

confidence: 72%

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Catalytic Synthesis, Characterization, and Properties of Polyaminoborane Homopolymers and Random Copolymers

et al. 2019

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Polyaminoboranes, [RNH–BH2] n , are boron–nitrogen analogues of polyolefins: however, to date, few soluble, well-characterized examples have been described. Herein, we show that metal-catalyzed dehydrocoupling of N-alkylamine–boranes Ph(CH2) x NH2·BH3 (x = 2–4) with pendant aryl groups yields soluble polyaminoboranes [Ph(CH2) x NH–BH2] n , using skeletal nickel, [Rh(μ-Cl)(1,5-COD)]2 (COD = cyclooctadiene), and [IrH2(POCOP)] (POCOP = κ3-1,3-(OPtBu2)2C6H3) as precatalysts in THF. Application of the most efficient catalytic system (1 mol %, [IrH2(POCOP)], THF, −40 °C) enabled the isolation of high molar mass, soluble polyaminoborane [Ph(CH2)4NH–BH2] n in moderate (ca. 40%) yield. Structural characterization was achieved by multinuclear nuclear magnetic resonance, infrared, and elemental analysis; and the molar mass was determined to be high (M n > 10 000 g mol–1) by gel permeation chromatography, dynamic light scattering, and, for comparison, also 1H diffusion-ordered spectroscopy methods. The optimized dehydropolymerization conditions for the Ir catalyst were also used to prepare copolymers from mixtures of Ph(CH2)4NH2·BH3 with either MeNH2·BH3, Ph(CH2)2NH2·BH3, or NH3·BH3. Significantly, soluble copolymers containing ca. 67% of [NH2–BH2] repeat units were prepared. The thermal stability of the polyaminoborane homopolymers and copolymers was studied by thermogravimetric analysis. The use of a cross-linker, H3B·NH2(CH2)8NH2·BH3, in the dehydropolymerization reactions led to improved ceramic yields after pyrolysis indicating that, with appropriate structural design, polyaminoboranes may be of potential future interest as precursors of boron-based ceramics.

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Section: Resultssupporting

confidence: 72%

Section: Characterization Of Polyaminoboranesupporting

confidence: 72%

Catalytic Synthesis, Characterization, and Properties of Polyaminoborane Homopolymers and Random Copolymers

et al. 2019

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“…The molecular weight and dispersity data obtained from GPC for each polymer are also presented in Table and chromatograms are in the Supporting Information (Figure S4). Given solubility constraints of the cationic polymers, an aqueous buffered mobile phase was required for GPC characterization . The uncharged control polymer GPC data were determined in a THF mobile phase, also due to solubility.…”

Section: Resultsmentioning

confidence: 99%

“…Given solubility constraints of the cationic polymers, an aqueous buffered mobile phase was required for GPC characterization. 44 The uncharged control polymer GPC data were determined in a THF mobile phase, also due to solubility. Polymers with 7 to 29% cationic charge were soluble in neither buffered water nor THF, thereby making GPC characterization ).…”

Section: Synthesis Synthesis Of the P[dopamine Methacrylamide-co-meth...mentioning

confidence: 99%

Positive Charge Influences on the Surface Interactions and Cohesive Bonding of a Catechol-Containing Polymer

Garcia-Rodriguez,

Wilker

2024

ACS Appl. Mater. Interfaces

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Achieving robust underwater adhesion remains challenging. Through generations of evolution, marine mussels have developed an adhesive system that allows them to anchor onto wet surfaces. Scientists have taken varied approaches to developing mussel-inspired adhesives. Mussel foot proteins are rich in lysine residues, which may play a role in the removal of salts from surfaces. Displacement of water and ions on substrates could then enable molecular contact with surfaces. The necessity of cations for underwater adhesion is still in debate. Here, we examined the performance of a methacrylate polymer containing quaternary ammonium and catechol groups. Varying amounts of charge in the polymers were studied. As opposed to protonated amines such as lysine, quaternary ammonium groups offer a nonreactive cation for isolating effects from only charge. Results shown for dry bonding demonstrated that cations tended to decrease bulk cohesion while increasing surface interactions. Stronger interactions at surfaces, along with weaker bulk bonding, indicate that cations decreased the cohesive forces. When under salt water, overall bulk adhesion also dropped with higher cation loadings. Surface attachment under salt water also dropped, indicating that the polymer cations could not displace surface waters or sodium ions. Salt did, however, appear to shield bulk cation−cation repulsions. These studies help to distinguish influences upon bulk cohesion from attachment at surfaces. The roles of cations in adhesion are complex, with both cohesive and surface bonding being relevant in different ways, sometimes even working in opposite directions.

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Size‐exclusion chromatography of cross‐linked superabsorbent polymers

Cutié¹

1995

J of Applied Polymer Sci

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SYNOPSISSuperabsorbent polymers are cross-linked poly(acry1ic acid) with some degree of neutralization. These polymers have found extensive use as constituents in personal care products such as sanitary napkins, incontinent devices, and disposable baby diapers that absorb body fluids. Polymer networks are formed, which makes the chromatography of these materials impossible. In this study, hydrolysis under heat and high pH was used to break the cross-links, which allows for traditional size-exclusion chromatography to determine molecular weight and molecular weight distribution of the primary chains. For the chromatography, TSK-GEL@+ PWxL columns and TSK-GEL P W columns were used. The mobile phase was buffered with sodium chloride and sodium phosphate salts to eliminate ionic interactions. Detection was by refractive index. 0 1995 John Wiley & Sons, Inc.

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Size exclusion chromatography of polyelectrolytes with aqueous elution solvents

Cited by 9 publications

References 4 publications

Catalytic Synthesis, Characterization, and Properties of Polyaminoborane Homopolymers and Random Copolymers

Catalytic Synthesis, Characterization, and Properties of Polyaminoborane Homopolymers and Random Copolymers

Positive Charge Influences on the Surface Interactions and Cohesive Bonding of a Catechol-Containing Polymer

Size‐exclusion chromatography of cross‐linked superabsorbent polymers

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