Light scattering study of ionomers in solution. 2. Low-angle scattering from sulfonated polystyrene ionomers

Hara, M.; Jian, Wu

doi:10.1021/ma00180a020

Cited by 66 publications

(56 citation statements)

References 9 publications

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“…Namely, the intensity of the scattered light is the sum of different contributions: larger particles contribute more at lower angles of observation and their contribution is strongly dependent on the angle, while the smaller macromolecules affect the total scattering intensity more at higher angles. The intensity of the scattered light therefore decreases with an increasing angle of observation [34][35][36]. Due to the presence of larger associates in pure water, the determined weight-average molar mass of the PALNa-1/1.0 copolymer was the highest in this solvent (Table 2), which is in agreement with the SEC-MALS results.…”

Section: Determination Of the Apparent Weight-average Molar Masses Ansupporting

confidence: 86%

Determination of the Molar-Mass Averages of Random Poly(aspartate-co-lactide) Copolymers by Tuning the Ionic Strength of the Solvent

et al. 2012

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Water-soluble sodium poly(aspartate-co-lactide) (PALNa) copolymers with a molar ratio of aspartateto-lactide units equal to 1:0.6, 1:1.0 and 1:1.5 were studied using NMR spectroscopy to determine the composition as well as SEC-MALS and static light-scattering measurements to determine the molar-mass characteristics of the copolymers. In the copolymer aqueous solutions, highmolar-mass species were detected, most probably due to the incomplete dissolution of the samples. The molar-mass averages determined in water with added simple electrolyte, i.e., NaCl, were much lower than the values determined in pure water. The concentration of the salt, which allows dissolution on a molecular level, and the separation predominantly according to a size-exclusion mechanism depend on the chemical composition of the PALNa copolymers. The optimal mobile phase for the PALNa-1/ 0.6 and the PALNa-1/1.0 copolymers was 0.1 M NaCl at pH 9, and for the PALNa-1/1.5 copolymer with a higher content of lactide units it was 0.05 M NaCl at pH 9. The molar-mass averages of the PALNa-1/1.0 copolymer, determined by SEC-MALS and static light-scattering measurements, were comparable.

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Section: Determination Of the Apparent Weight-average Molar Masses Ansupporting

confidence: 86%

Determination of the Molar-Mass Averages of Random Poly(aspartate-co-lactide) Copolymers by Tuning the Ionic Strength of the Solvent

et al. 2012

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“…This is another indication of these aggregates being starlike, since in the case of star polymers with a functionality higher that six star size depends on the length, and not on the number, of arms in both good and theta solvents. The second-moment values in decalin are similar to those reported in CCl 4 showing that aggregates in this solvent are also polydisperse. However, a single peak was resolved in all cases by CONTIN analysis.…”

Section: Aggregation Behavior In CCLsupporting

confidence: 81%

“…[3][4][5] System parameters like the chemical nature and the molecular weight of the polymer chain as well as the nature, amount, and position of the associating groups dictate the aggregation behavior of such Full Paper: Three series of o-functionalized polystyrenes (PS) with different molecular weights, the first consisting of dimethylamino end-capped PSs and the other two of o-branched PSs end-capped with two and three lowmolecular-weight (M n $ 500 g Á mol À1 ) dimethylamino ofunctionalized polybutadienes (PB), were synthesized by high-vacuum anionic polymerization techniques using the functional initiator ( [3-(dimethylaminopropyl)]lithium) and chlorosilane linking chemistry. The o-dimethylamino polymers (precursors) were molecularly characterized by sizeexclusion chromatography, low-angle laser light scattering (LALLS), membrane osmometry, and NMR spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Model ω‐Functionalized Linear Polystyrenes with One, Two, and Three Sulfobetaine End Groups: Synthesis, Characterization, and Association Behavior

Sakellariou

Pispas

Hadjichristidis

2003

Macro Chemistry & Physics

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Three series of ω‐functionalized polystyrenes (PS) with different molecular weights, the first consisting of dimethylamino end‐capped PSs and the other two of ω‐branched PSs end‐capped with two and three low‐molecular‐weight (Mn ∼ 500 g · mol−1) dimethylamino ω‐functionalized polybutadienes (PB), were synthesized by high‐vacuum anionic polymerization techniques using the functional initiator ([3‐(dimethylaminopropyl)]lithium) and chlorosilane linking chemistry. The ω‐dimethylamino polymers (precursors) were molecularly characterized by size‐exclusion chromatography, low‐angle laser light scattering (LALLS), membrane osmometry, and NMR spectroscopy. The characterization results indicate a high degree of molecular and structural homogeneity. The dimethylamino end groups were transformed to the highly polar sulfozwitterionic ones (see Figure) by reaction with cyclopropanosultone. The mono‐, di‐, and tri‐zwitterion capped polymers were found by LALLS, dynamic light scattering (DLS) and viscometry, to associate in carbon tetrachloride, a good nonpolar solvent for the PS tail. In contrast, results on dimethylamino‐capped precursors show no evidence of aggregation. Aggregation numbers increase in decalin compared with those in carbon tetrachloride. At constant molecular weight of the parental PS, the degree of association increases with increasing number of functional groups and for a given number of functional groups with decreasing molecular weight of the PS tail. Temperature‐dependent light scattering measurements in decalin indicate that aggregation persists at the highest temperature investigated.A schematic representation of the materials investigated in this study.magnified imageA schematic representation of the materials investigated in this study.

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“…The optical clarification of the solution was carried out by passing the solution through two membranes (PTFE Membrane Filter: Whatman), whose pore sizes were 0.45 and 0.1 µm (or 0.2 µm), in succession. Experimental details concerning low-angle light scattering [14], angular light scattering [15], and dynamic light scattering analysed by CONTIN [16] are described elsewhere.…”

Section: Methodsmentioning

confidence: 99%

Light scattering study of salt-free ‘polyelectrolyte behaviour’ of monotelechelic ionomers in a polar solvent

Kupperblatt

Hara

Vanhoorne

et al. 1996

Polymer

Self Cite

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Salt-free polyelectrolyte behaviour which is typically observed at low polymer concentrations for polyelectrolyte aqueous solutions and random ionomer non-aqueous solutions (in polar solvents) (i.e., negative angular dependence of the reciprocal scattering in static light scattering and an appearance of the fast mode in dynamic light scattering) has been observed for monotelechelic ionomer solutions in a polar solvent. This indicates that only single charge (per chain) is sufficient to produce intermolecular electrostatic interactions, which are responsible for such characteristic behaviour. However, the 'characteristic' behaviour, which is typically observed at higher concentrations for polyelectrolyte and random ionomer solutions (i.e., large positive apparent radius of gyration in static scattering and appearance of the slow mode in addition to the fast mode in dynamic scattering) has not been observed to date for monotelechelic ionomer solutions. The absence of highconcentration characteristics for the monotelechelic ionomer solutions gives additional insight as to the nature and structure of 'heterogeneities' in salt-free polyelectrolyte solutions, which is still controversial.

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Light scattering study of ionomers in solution. 2. Low-angle scattering from sulfonated polystyrene ionomers

Cited by 66 publications

References 9 publications

Determination of the Molar-Mass Averages of Random Poly(aspartate-co-lactide) Copolymers by Tuning the Ionic Strength of the Solvent

Determination of the Molar-Mass Averages of Random Poly(aspartate-co-lactide) Copolymers by Tuning the Ionic Strength of the Solvent

Model ω‐Functionalized Linear Polystyrenes with One, Two, and Three Sulfobetaine End Groups: Synthesis, Characterization, and Association Behavior

Light scattering study of salt-free ‘polyelectrolyte behaviour’ of monotelechelic ionomers in a polar solvent

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