Dynamic mechanical relaxations of ethylene ionomers

Tachino, Hitoshi; Hara, H.; Hirasawa, Eisaku; Kutsumizu, Shoichi; Tadano, Kenji; Yano, Shinichi

doi:10.1021/ma00056a029

Cited by 82 publications

(61 citation statements)

References 5 publications

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“…Due to this effect, COOH acid groups tend to exist around sodium ions, and therefore the sodium ion and a proton can be exchanged between COO-Na and COOH. As proposed by Vanhoorne et al 17) , this "acid-cation exchange" mechanism allows a polymer segment to easily diffuse from one ion aggregate to others, and lowers the friction for the segmental motion. In the case of zinc ionomers, a zinc ion is coordinated with two COO -groups due to ionic bonds, and no COOH group exists around zinc ions.…”

Section: Resultsmentioning

confidence: 98%

The Effects of Metal Cation Types on Zero Shear Viscosities for Ethylene-co-Methacrylic Ionomer Melts

Nishioka

Nishio

Koda

et al. 2005

J. Soc. Rheol., Jpn

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The effects of ion aggregates on zero shear viscosities η 0 for ethylene-co-methacrylic ionomer melts were investigated. Rapid increasing of η 0 for Zn ionomers was shown in high neutralization degree, however, the rapid increase was not observed in all range of neutralization degree for Na ionomers. These results indicate that the formation of ion aggregates strongly affects η 0 only for Zn ionomers. We expect that acid cation exchange, in the case of Na ionomers, cancels effect of ion aggregates on η 0 . On the other hand, formation of ion aggregates affects on damping functions for both cases of Na and Zn ionomers. In the case of Zn ionomers, the value of η 0 in high neutralization degree(>40%) deviated from linear regime. This neutralization degree well corresponds to the onset of strong strain dependence of h(γ). We hence consider that measurement of neutralization dependence of η 0 is one of the ways to detect existence of ion aggregates in EMAA-Zn ionomer melts.

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Section: Resultsmentioning

confidence: 98%

The Effects of Metal Cation Types on Zero Shear Viscosities for Ethylene-co-Methacrylic Ionomer Melts

Nishioka

Nishio

Koda

et al. 2005

J. Soc. Rheol., Jpn

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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%

“…They also reported that the lowest neutralization degree for formation of ionic aggregates is 80 % for EMAA ionomer neutralized with zinc ion 2,3) . Existence is reported of ionic aggregates in EMAA ionomer at even 300 ºC which is higher than melting temperature 9) .…”

Section: Introductionmentioning

confidence: 97%

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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“…We also found that the introduction of a very small amount of POE into the K salts of EMAA, carried out by an esterification reaction, significantly lowered Ps values, especially taken at lower sides of the relative humidity. 16 These findings will be useful when anti-electrostatic ionomers are. required to be used at very low humidities.…”

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confidence: 97%

Anti Electrostatic Properties of Various Types of Ethylene Ionomers

Tachino

Hara

Hirasawa

et al. 1994

Polym J

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ABSTRACT:The relationship between ionomer structure and surface resistivity (p,) was studied for Na, K, Cs, Mg, and Zn ionomers prepared from poly(ethylene-co-methacrylic acid) (EMAA) and poly(ethylene-co-acrylic acid) (EAA). The study revealed that only ionomers highly neutralized with alkali metal cations exhibit anti-electrostaticity and the origin of ionic conduction was assumed to result from the transfer of water-coordinated metal cations. The method of mixing high-and low-acid ionomers was found to be effective in reducing the magnitude of moisture absorption while maintaining the anti-electrostaticity. Blends of a potassium ionomer with a wide variety of thermoplastics were also prepared to evaluate the possibility of using ethylene ionomers as anti-electrostatic additives. Interestingly, the effect of the potassium ionomer upon p, of the blends differed by the type of the thermoplastics, suggesting that how the ionomer phase distributes over the blends may be influenced by local interactions between ionomer and polymer matrix phases.KEY WORDS Ethylene Ionomer / Alkali Metal Salt / Anti-Electrostatic Property / Surface Resistivity / Moisture Uptake / Ionomers are defined as polymers consisting of hydrophobic backbones and a small amount of ionic moieties attached to or at the terminal of the polymer backbones. Despite the presence of ionic groups, there is little difference in the electrical properties between ionomers and their host polymers so that ionomers are generally considered to be an electrical insulator. For example, volume resistivity at 23°C and 50% relative humidity was 4.07 x 10 16 and 17 .2 x 10 16 Q · cm -1 for an ethylene ionomer and a low-density polyethylene, respectively. 1 This indicates that metal cations of ethylene ionomers are tightly bound to carboxylate ions that are covalently bonded to the polymer backbones.terested in the structure and properties of ethylene ionomers, and more emphasis has currently been placed on their structural changes caused by water absorption. 2 -4 Our studies revealed that hydrophilic ionic groups are strong absorption sites of water molecules and water absorption preferentially affects the structure of the ionic aggregates. Such plasticizing effects usually create unfavorable impacts on the physical properties due to the softening of rigid ionic cross-links. From the de conductivity study on the ethylene ionomers, we also found that water absorption influences de conductivity of ethylene ionomers; de conductivity at ambient temperature became more than 10 times with an increase of the water content from 0.45 to 1.1 wt¾. 5

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Dynamic mechanical relaxations of ethylene ionomers

Cited by 82 publications

References 5 publications

The Effects of Metal Cation Types on Zero Shear Viscosities for Ethylene-co-Methacrylic Ionomer Melts

The Effects of Metal Cation Types on Zero Shear Viscosities for Ethylene-co-Methacrylic Ionomer Melts

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

Anti Electrostatic Properties of Various Types of Ethylene Ionomers

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