<i>Introduction to Ionomers</i>

Eisenberg, Adi; Kim, Joon‐Seop; Ratner, Mark A.

doi:10.1063/1.882601

Cited by 180 publications

(355 citation statements)

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“…For a typical ionomer with $5 mol% ionic group incorporation, the increase is in the order of 15-258C [136]. In other words, ionic groups seemingly do not interfere with dynamics, and hence presumably the morphology, of the amorphous phase to a significant extent.…”

Section: Amorphous Polymer Regions: Greater Than Nanometer Length Scalementioning

confidence: 87%

“…The only somewhat inconsistent aspect with respect to experimental data is that if this theory was correct, then a second glass transition would be expected in measurements made via DSC. In the vast majority of cases, one glass transition in DSC spectra is found independent of ionic content and/or neutralization level, [85,[137][138][139] although in a small number of cases two glass transition heat capacity jumps were evident [137,140,141]. In a study on sodium-neutralized SMAA, [137] it was shown that the second peak in tan delta was measurable beginning at 1% ionic content, while the second DSC transition only was measurable beginning at 8.2% ion content.…”

Section: Amorphous Polymer Regions: Greater Than Nanometer Length Scalementioning

confidence: 99%

“…2. In the mid-to-late 1990s, three books appeared that reviewed the general subject of ionomers in detail; one a dual-author tome by Eisenberg and Kim, [9] and two contributed works; one edited by Tant et al [10] and the other FIG. 1. Structure of some common ionomers; the sodium form is shown.…”

Section: Introductionmentioning

confidence: 99%

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Review and critical analysis of the morphology of random ionomers across many length scales

Grady

2008

Polymer Engineering & Sci

101

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This review presents a description of what is known about ionomer morphology. All papers on ionomer morphology are not included in this review; but all relevant questions about ionomer morphology are posed and answered as completely as possible. The review is critical; that is, reasons are given for morphologies that are deemed to be more or less likely. The review is organized along three length scales: sub-nanometer, nanometer to 10 nm, and greater than 10 nm. Within each length scale, all three phases are considered: crystalline, amorphous, and ionic aggregate. The purity of the three phases, the arrangement of atoms in the three phases, the size and shape of the three phases, and their arrangements in space relative to each other are explored in this review. A model for the shape of aggregates in ionomers that have well-ordered internal environments is presented. This model proposes that aggregates are fundamentally planar, but will ''roll up'' into tubes or other related structures in order to reduce the number of atoms at aggregate edges. This model was developed primarily based on the varied morphologies ionomers have shown in electron micrographs, but is consistent with other indirect measurements of ionomer morphology.

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Section: Amorphous Polymer Regions: Greater Than Nanometer Length Scalementioning

confidence: 87%

Section: Amorphous Polymer Regions: Greater Than Nanometer Length Scalementioning

confidence: 99%

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Review and critical analysis of the morphology of random ionomers across many length scales

Grady

2008

Polymer Engineering & Sci

101

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“…Much of the work has appeared in a recent monograph by Eisenberg and Kim, entitled ,"Introduction to lonomers" [13]. Of interest to this work is the characterization of the sodium salt of a copolymer of styrene and methacrylic acid.…”

Section: Discussionmentioning

confidence: 99%

Molecularly Imprinted Ionomers

Murray

Southard

2002

MRS Proc.

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Ionomers have been defined as copolymers that have a certain proportion of ionic groups. The ionic groups have a significant effect on the mechanical properties of the copolymers. This is generally due to aggregation of ions in a low dielectric medium. The primary result is to restrict chain motion and raise the glass transition temperature. These attributes have relevance to molecular imprinting, since restricted chain motion should help preserve the integrity of the binding site. The connection between ionomers and molecular imprinting has come from the production of metal ion imprinted resins. Metal ions are used in the production of molecularly imprinted polymer ion exchange resins and ionically permeable membranes. The polymers have applications as separations media, sequestering media and as ion selective sensors. Metal ions are also being used to form imprinted polymers based on metal mediated imprint binding. We have prepared ion exchange resins, selectively permeable polymer membranes, ion selective electrodes and ion selective optical sensors using a modified version of the molecular imprinting technique. The modification is a reduction in the amount of covalent crosslinking used to form the polymers. This reduction may be justified by the presence of residual metal ion crosslinking in the immediate region of the imprinted binding site. The effects of metal ions on the thermal and mechanical properties of the polymers, as well their impact on binding selectivity are critical variables.

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“…Proton conductivity or proton transport is of major interest in several fields, ranging from biological systems to materials science combining chemistry and physics, some of them having important technological potential, for example in fuel cells (for the extensive literature on various applications see for example and more generally for ion-containing polymers [157]). Responsive smart materials will also be presented, illustrating possibilities offered by phase transitions to tune the properties.…”

Section: Self-assembled Protonically Conducting Polymersmentioning

confidence: 99%