Order-disorder transition of ionic clusters in ionomers

Tadano, Kenji; Hirasawa, Eisaku; Yamamoto, H.; Yano, Shinichi

doi:10.1021/ma00191a043

Cited by 182 publications

(144 citation statements)

References 9 publications

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“…This ageing peak was present at room temperature and was observed to shift to progressively higher temperatures with increased annealing temperature while in the oven of the projectile test station prior to damage. As described above, this peak has been attributed as a 'quasicrystalline' peak characteristic of EMAA ionomers and forms with ageing and annealing (Tadano et al 1989). Conveniently, its presence here serves as an artefact for comparing the two locations and hence the effect of the puncture/healing process.…”

Section: Dsc Of Ambient and Elevated Temperature Puncturesmentioning

confidence: 87%

Thermal characteristics of the self-healing response in poly(ethylene- co -methacrylic acid) copolymers

Kalista

Ward

2006

J. R. Soc. Interface.

234

187

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A class of poly(ethylene-co-methacrylic acid) (EMAA) copolymers and ionomers has shown the unique ability to instantaneously self-heal following ballistic puncture. It is noteworthy that the thermomechanical healing process active in these materials appears to be significantly different in capability and mechanism than any of the other self-repairing systems studied. To better understand this phenomenon, the thermal response during EMAA self-healing was examined. Tests of various damage types, including sawing, cutting and puncture, revealed high-energy transfer damage modes to produce heat and store energy favourable to healing. DSC probed healed specimens revealing they had reached the viscoelastic melt believed requisite to healing response. Low-temperature ballistic experiments demonstrated films continue healing even when punctured at K308C; analysis showed healing efficacy comparable to room temperature, holding significant pressures of approximately 3 MPa. At the lowest temperature, brittle fracture occurred in one material indicating insufficient heat transfer to store recoverable energy. In total, the results supported the defined healing model and provided additional information on the healing process in both its thermal dependence and general mechanism. Finally, a new DSC method was developed for probing the thermal history of healed films which may lead to a more complete mechanistic model.

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Section: Dsc Of Ambient and Elevated Temperature Puncturesmentioning

confidence: 87%

Thermal characteristics of the self-healing response in poly(ethylene- co -methacrylic acid) copolymers

Kalista

Ward

2006

J. R. Soc. Interface.

234

187

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“…In 1989, [101] Yano and coworkers. postulated that at higher temperatures, ionic aggregates underwent an orderdisorder transition, that is, the atomic arrangement inside the aggregates was ordered below that temperature and disordered above that temperature.…”

Section: Ionomer Synthesismentioning

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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“…Ionomer retains pseudcross-linked structure mediated by ionic aggregates. Due to the existence of ionic aggregates, stiffness and impact resilience of EMAA ionomer are higher than those of EMAA [1][2][3][4][5][6][7][8] .…”

Section: Introductionmentioning

confidence: 96%

Strong Attractive Interaction between Ethylene Ionomer and Carboxyl Groups of Styrene-Co-Methacrylic Acid

Takaki

Koda

Haba

et al. 2017

J. Soc. Rheol., Jpn

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Effects of styrene-co-methacrylic acid (StMAA) on melt viscosity and morphology for ethylene ionomer were studied. In this study, we used poly-(ethylene-co-methacrylic acid) of neutralization degree 54 % with sodium ions (EMAA54Na). Dynamic viscoelasticity of EMAA-54Na/polystyrene(PS) or EMAA-54Na/StMAA blends was evaluated. EMAA54Na/StMAA blends differed from EMAA-54Na/PS blends in rheological property. Zero shear viscosity η 0 of EMAA54Na/StMAA was higher than expected viscosity with increasing contents of StMAA. Furthermore, fall down of the damping function obtained from stress relaxation measurement of EMAA-54Na/StMAA was weaker than that of EMAA54Na. These results indicated strong interaction between EMAA ionomer and carboxyl groups of StMAA. Results of morphological observation and Fourier transform infrared spectroscopy also indicated that the strong interaction is attractive.

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Order-disorder transition of ionic clusters in ionomers

Cited by 182 publications

References 9 publications

Thermal characteristics of the self-healing response in poly(ethylene- co -methacrylic acid) copolymers

Thermal characteristics of the self-healing response in poly(ethylene- co -methacrylic acid) copolymers

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

Strong Attractive Interaction between Ethylene Ionomer and Carboxyl Groups of Styrene-Co-Methacrylic Acid

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