Effect of ionic interaction on linear and nonlinear viscoelastic properties of ethylene based ionomer melts

Takahashi, Tatsuhiro; Watanabe, Jun; Minagawa, Keiji; Takimoto, Jun–ichi; Iwakura, Kenji; Koyama, Kiyohito

doi:10.1007/bf00398436

Cited by 42 publications

(26 citation statements)

References 43 publications

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“…sample by the time-temperature superposition principle. It has been found that, within the frequency range studied, the timematerial superposition rule 2,3) is applicable in both series of the blends; the muster curve for each blend sample can be superposed on that of EMAA by horizontal shifting, as follows:…”

Section: Methodsmentioning

confidence: 99%

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Composition Dependence of Viscosity of Ethylene Ionomer Blends.

Nishio

Nishioka

Takahashi

et al. 2002

J. Soc. Rheol., Jpn

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Section: Methodsmentioning

confidence: 99%

“…[2][3][4] Especially, Vanhoorne and Register 5) studied the effect of the protons of unneutralized acid groups on the melt rheology of partially neutralized EMAA ionomers.…”

Section: Introductionmentioning

confidence: 99%

Composition Dependence of Viscosity of Ethylene Ionomer Blends.

Nishio

Nishioka

Takahashi

et al. 2002

J. Soc. Rheol., Jpn

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“…We have already reported the influence of graft copolymerized structure on the elongational viscosity [9]. We have also studied how ionic interaction affects the strain-hardening elongational properties by using partially ionized random copolymers [10,11].…”

Section: Introductionmentioning

confidence: 99%

Uniaxial Elongational Viscosity of Poly (Styrene-Block-Butadiene-Block-Styrene) Melts

Takahashi

Takimoto

Koyama

1998

Journal of the Society of Materials Science, Japan

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Experimental studies about the effect of block copolymerized structures on the uniaxial elongational viscosity were performed. Two poly (styrene-block-butadiene-block-styrene) (SBS, S/B weight ratio=4/6) samples with linear and star (4arms) structures were used for the elongational viscosity measurement at constant strain rates. The block copolymer samples exhibited the strain-softening elongational viscosity. This property was in contrast to the strain-hardening elongational viscosity which is observed for homopolymer melts. The cause of the strain-softening property was analyzed from the structural change by small angle X-ray (SAX) and transmission electron microscope (TEM). The lamellar structures were more oriented and became longer along the elongational direction e elongation, while the lamellar thickness remained almost constant. he obsrvation inicates that the laellar structures, instead of the SBS molecules, were oriented and stretched. The rheological discussion on the strain-softening elongational viscosity was also carried out by the BKZ model. The damping functions of the block copolymers from step-shear relaxation experiments showed larger decrease than that of the Doi-Edwards prediction. The structural change observation and the BKZ analysis suggested that the largely decreased damping functions are due to the lamellar orientation and cause the strain-softening elongational property.

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“…Meanwhile, a pseudo-master curve of G' for the reduced frequency dependence can be obtained. However, Takahashi et al 15) showed that the time-temperature superposition principle was applicable not only to EMAA but also to EMAA ionomers, and a single super master curve was obtained by horizontal shift from the master curves of EMAA and EMAA ionomers.…”

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confidence: 99%

Dynamic Viscoelasticity of Ionomers Based on Ethylene-co-Methacrylic Acid Copolymer in the Melt State.

Zeng

Takahashi

Yamane

et al. 1999

J. Soc. Rheol., Jpn

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Dynamic viscoelasticity of ethylene-co-methacrylic acid copolymer (EMAA) and its ionomers (EMAA-Zn and EMAA-Na) has been measured in the melt state. The time-temperature superposition principle is applicable to data of angular frequency dependences of storage modulus (G') and loss modulus (G") for EMAA very well from 140°C to 200°C. On the other hand, data for ionomers give two separated master curves with different temperature dependences of shift factor, one from the data obtained in the range of 140°C-170°C and the other in the range of 180°C-200°C. Even at 200°C, the moduli G' and G" are still much higher than those of EMAA. These results indicate that a structure change in EMAA ionomers occurs between 170°C and 180°C. The free volume fraction (f r ) and the thermal expansion coefficient (α f ) in the range of 180°C-200°C are larger than those in the range of 140°C-170°C for EMAA ionomers. This implies that in higher temperature range, some hydrocarbon chains depart from cross-links of ion aggregates and move much more freely.

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Effect of ionic interaction on linear and nonlinear viscoelastic properties of ethylene based ionomer melts

Cited by 42 publications

References 43 publications

Composition Dependence of Viscosity of Ethylene Ionomer Blends.

Composition Dependence of Viscosity of Ethylene Ionomer Blends.

Uniaxial Elongational Viscosity of Poly (Styrene-Block-Butadiene-Block-Styrene) Melts

Dynamic Viscoelasticity of Ionomers Based on Ethylene-co-Methacrylic Acid Copolymer in the Melt State.

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