Small-angle x-ray scattering investigations of ionomers with variable-length side chains

Moore, Robert B.; Bittencourt, Diomar da Rocha Santos; Gauthier, Mario; Williams, C. E.; Eisenberg, Adi

doi:10.1021/ma00006a024

Cited by 74 publications

(63 citation statements)

References 4 publications

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“…Assuming no isolated ions allows for the calculation of the number of ions per aggregate, and hence the aggregate size assuming some packing density inside the aggregate. A number of papers have used this sort of analysis to quantify size parameters of aggregates [132,133]. The problem with this approach is the same as with the Yarusso-Cooper approach; in many cases spherical scattering objects are not appropriate.…”

Section: Compression Moldingmentioning

confidence: 99%

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: Compression Moldingmentioning

confidence: 99%

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

Grady

2008

Polymer Engineering & Sci

101

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“…4 In general, the ionomers show a small angle X-ray scattering (SAXS) peak, the position of which has been associated with the inter-multiplet distance. 6,7 The peak position was also interpreted to be related to the distance between the ionic core and the ionic shell in partly crystalline ethylene ionomers. 8 Since partly crystalline ionomers have a wide range of application, extensive studies have been devoted to their morphology.…”

Section: Introductionmentioning

confidence: 99%

“…8 Since partly crystalline ionomers have a wide range of application, extensive studies have been devoted to their morphology. [1][2][3]8 The morphology of polystyrene 7,[9][10][11][12][13][14][15][16][17][18][19][20][21][22] ionomers was also investigated widely using the SAXS technique.…”

Section: Introductionmentioning

confidence: 99%

Sulfonated polystyrene ionomers containing 4-aminobenzoic acid studied by a small-angle X-ray scattering technique

et al. 2002

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In a recent study by the same authors using a DMTA (Dynamic Mechanical Thermal Analyzer), it was found that the 4-aminobenzoic acid (ABA) molecules acted as either a neutralizing agent, or a plasticizer, or a filler, depending on the order of mixing of poly(styrene-co-styrenesulfonic acid) (PSSA), ABA, and NaOH. Subsequent to that study, we here pursued the same topic, i.e., the effect of the addition of CsOH (instead of NaOH) and ABA on the morphology of PSSA, but this time, by using a small-angle X-ray scattering (SAXS) technique. In line with the previous results, the present study with the SAXS technique verified that the order of mixing has a significant effect on the morphology of ionomers. In addition, with the SAXS data and the density values of the ionomers, we attempted to calculate both the number of sulfonate ionic groups per multiplet and the size of the multiplet of the ionomer.

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“…To explain the above dependences, one should consider the fundamental concepts of the modern theory of ionomers advanced by, for example, Eisenberg, [6] MacKnight, [35] Cooper, [36] Moore, [37] Marx. [38] According to the above works, the morphology and molecular mobility of ionomers are primarily controlled by the development of stable ionic aggregates (multiplets).…”

Section: Samplementioning

confidence: 99%

Dielectric Relaxation of Side‐Chain Liquid Crystalline Ionomers Containing Alkaline Metal Ions

Никонорова

Barmatov

Pebalk³

et al. 2005

Macro Chemistry & Physics

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Summary: Two sets of side‐chain, liquid‐crystalline ionomers based on copolymers of butyl acrylate and 4‐{[6‐(acryloyloxy)hexyl]oxy}benzoic acid containing 2.5–20 mol‐% of lithium or rubidium ions were studied. As the content of ions of alkali metals increases, segmental mobility markedly decreases. As compared with rubidium‐containing ionomers, ionomers containing lithium ions are characterized by a far more efficient decrease in their dielectric relaxation times because ionic radius of lithium ions is lower than that of rubidium ions.image

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Small-angle x-ray scattering investigations of ionomers with variable-length side chains

Cited by 74 publications

References 4 publications

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

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

Sulfonated polystyrene ionomers containing 4-aminobenzoic acid studied by a small-angle X-ray scattering technique

Dielectric Relaxation of Side‐Chain Liquid Crystalline Ionomers Containing Alkaline Metal Ions

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