Structures and Properties of Hydrocarbon Ionomer Membranes. 2. Polystyrene-Based Cation Exchangers

Jiang, Meichun; Gronowski, Adam; Yeager, H. L.; Wu, Guang‐Peng; Kim, J.-S.; Eisenberg, A.

doi:10.1021/ma00100a045

Cited by 25 publications

(19 citation statements)

References 17 publications

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“…It is thus not unreasonable to assume that the associated structures of the ionomer are reflected and dictates the structures of the water molecules. This interpretation is in agreement with the mid-infrared work of Brozoski et al 10,11 and the NIR work of Eisenberg and co-workers, 17 which have pointed out the important and multistructural characteristic of water in ionomer.…”

Section: Discussionsupporting

confidence: 91%

“…Assignments for the ionic units are more tentative in the absence of specific literature data. The major transitions at 1909 nm and the pronounced 1980 nm shoulder have contributions from the intense water (absorbed) OH combination band 17 and the overtone of the CAO. The water OH first stretching overtone is present at 1413 nm.…”

Section: Nir Spectramentioning

confidence: 99%

“…In conjunction with mid-IR, Raman, and fluorescence experiments the authors proposed correlations between aggregation and up-conversion phenomena. Jiang et al 17 utilized the NIR water combination mode, 1900 -2000 nm, to study the molecular environments of the sorbed water in ionomers. From band fitting calculations multiple structurally distinct species were inferred.…”

Section: Introductionmentioning

confidence: 99%

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Near infrared studies of styrene-sodium methacrylate ionomers

Garcia

Kim

Eisenberg

1998

J. Polym. Sci. B Polym. Phys.

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Section: Discussionsupporting

confidence: 91%

Section: Nir Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Near infrared studies of styrene-sodium methacrylate ionomers

Garcia

Kim

Eisenberg

1998

J. Polym. Sci. B Polym. Phys.

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“…These observations are consistent with separate reports by Jiang and Eisenberg that the water/salt ratios increased with increasing ion content. [57] It was estimated that the PBSis contain about 14 water molecules per ion pair, which is significantly higher than the water uptake of polystyrene-based ionomers, possessing 2.8 water molecules per ion pair. [58] The hydrolytic degradation of PBSis was drastically accelerated with increasing ionic content ( Figure 5).…”

Section: Degradation and Biocompatibility Of Polyester-based Ionomersmentioning

confidence: 99%

Biodegradable Aliphatic Polyester Ionomers

Han

Yoo

Kim

et al. 2004

Macromolecular Bioscience

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A series of polyester-based ionomers containing dimethyl 5-sulfoisophthalate sodium salt (DMSI) with up to 5 mol-% diacid units was synthesized by two-step polycondensation. Furthermore a polylactic acid (PLA) was modified by introducing poly(ethylene-co-methacrylic acid) ionomers with different ion groups, such as Na, Li, and Zn, using the melt blending method. This review examines the effect of the ionic group on the dynamic mechanical properties, melt rheology, crystallization behavior, degradation behavior, and biocompatibility with human dermal cells, as well as the nucleating effect of poly(ethylene-co-methacrylic acid) ionomer in PLA.

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“…0.32A -1 (q=4nsin8fJ,, where e is half the scattering angle and Jc is the X-ray wavelength). 3 q corresponds to a Bragg spacing (dsragg) of ca. 20 A.…”

mentioning

confidence: 99%

Morphology of Sulfonated Random Ionomers Based on Hydrogenated Styrene–Butadiene Copolymer Studied by SAXS

Kim

NISHIDA

Eisenberg

1999

Polym J

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KEY WORDSMorphology 1 Small-Angle X-Ray Scattering I Ionomer I Styrene-Butadiene I Ionomer Peak I Hydrogenation I During the past three decades, extensive studies have been performed to improve our understanding of the morphology and properties of ionomers. It is generally accepted that ionic groups form aggregates, called multiplets. 1 The Eisenberg-Hird-Moore (EHM) model, a recent model of the morphology of random ionomers, postulates that polymer chains surrounding the multiplets undergo reduction in mobility. 2 At very low ion content, only multiplets are present. As the number density of the multiplets increases with ion content, the regions of restricted mobility start to overlap and form large contiguous regions of reduced mobility. When the dimensions of these regions exceed ca. 100 A, they are called clusters. 2 In this state, the ionomer exhibits two glass transitions: one for the matrix regions is found at lower temperatures, while that for the cluster regions is located at higher temperatures.In general, clustered ionomers exhibit small-angle peaks in small-angle X-ray scattering (SAXS) profiles. The poly(styrene-co-cesium methacrylate) ionomer containing ca. 7 mol% of ions exhibits the maximum in the SAXS peak at q=ca. 0.32A -1 (q=4nsin8fJ,, where e is half the scattering angle and Jc is the X-ray wavelength). 3 q corresponds to a Bragg spacing (dsragg) of ca. 20 A.Bragg spacing is thought to reflect the distance between multiplets. 4 • 5 The poly(styrene-co-cesium styrenesulfonate) ionomer (ca. 5 mol% of ions) shows the maximum of the SAXS peak at qmax=ca. 0.15A -1 (dsragg=ca. 42 A). 6 Another interpretation of the SAXS profile, the so-called core-shell model, has also been proposed. 7 The dynamic mechanical properties of sulfonated poly(styrene-co-ethylene-co-butylene) (SPSEB) random ionomers have been investigated. 8 Thus, as a follow-up work, the present study explores the morphology of the SPSEB ionomers. The comparison of the results obtained in this study with those from the sulfonated polystyrene ionomers is also made. Among the results obtained in the present study, the answers to the following two questions are of most importance; 1) what type of morphology does this ionomer system have? 2) what is the effect of the matrix Tg on the multiplet formation?t To whom correspondence should be addressed. EXPERIMENTAL Polymer SynthesisThe preparation and sulfonation of a hydrogenated poly(styrene-co-butadiene) random copolymers, i.e., poly(styrene-co-ethylene-co-butylene) (PSEB), are described elsewhere. 8 The PSEB copolymer is composed of 73 mol% of ethylene, 8 mol% of butylene, and 19 mol% of styrene. The polymer was sulfonated using a modification of the sulfonation method of Thaler. 9 The sulfonation level was determined by titration of the sulfonated PSEB (SPSEB) sample with standard methanolic NaOH to the phenolphthalein end point. Sample PreparationThe copolymers were dissolved in a mixture of xylenefl-butanol (3/1 vfv, for ionomers of low ion contents) or in a mixture of methanolftetrahyd...

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Structures and Properties of Hydrocarbon Ionomer Membranes. 2. Polystyrene-Based Cation Exchangers

Cited by 25 publications

References 17 publications

Near infrared studies of styrene-sodium methacrylate ionomers

Near infrared studies of styrene-sodium methacrylate ionomers

Biodegradable Aliphatic Polyester Ionomers

Morphology of Sulfonated Random Ionomers Based on Hydrogenated Styrene–Butadiene Copolymer Studied by SAXS

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