Rheological properties of ethylene ionomer neutralized with binary metal cation

Nishio, Mihoko; Nishioka, Akihiro; Taniguchi, Takashi; Koyama, Kiyohito

doi:10.1016/j.polymer.2004.10.071

Cited by 19 publications

(15 citation statements)

References 11 publications

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“…The decrease in the viscosity followed the order Al 3+ < Zn 2+ < Na + . Nishio et al32 reported that the zero‐shear viscosity of poly (ethyl methacrylic acid)‐EMMA ionomers depended on the kind of metal cations. Xie and Ma33 observed the same phenomenon in their sulfonated ethylene–propylene–diene monomer ionomers.…”

Section: Resultsmentioning

confidence: 99%

Tailoring the ionic association and microstructure of ionomers with various metal salts

Gao

Choudhury

Dutta

2012

J of Applied Polymer Sci

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In this work, we investigated the effects of metal stearate salts on the structure, morphology, and properties of poly(ethylene-acrylic acid) neutralized by zinc salts (PI). The samples were characterized in detail with spectroscopic [Fourier transform infrared (FTIR) spectroscopy], microscopic (hot-stage optical microscopy), thermal [thermogravimetric analysis, modulated differential scanning calorimetry, and dynamic mechanical analysis], mechanical, and scattering (small-angle neutron scattering and small-angle X-ray scattering) techniques. The melt rheological properties of the samples were also investigated. The structure of the ionic domains was determined by the type of cations and the salt proportion (FTIR). The predominant interaction was found to exist between the metal stearate and the ionic group. Na þ cation exhibited a unique behavior, whereas Zn 2þ showed a coordinated structure and, hence, properties. The ionic groups in the Na and Zn stearate systems existed as multiplets and clusters, but multiplets were the main structure in the Al salt system. The salts acted as plasticizers above their melting points (mp's) but as fillers below their mp's. The melt flow properties of PI were significantly affected by the metal cation and salt proportion and were improved greatly by the introduction of the salts. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E130-E141, 2012 Figure 8 Effect of metal stearates on the stress-strain behavior of PI. E140 GAO, CHOUDHURY, AND DUTTA Journal of Applied Polymer Science

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Section: Resultsmentioning

confidence: 99%

Tailoring the ionic association and microstructure of ionomers with various metal salts

Gao

Choudhury

Dutta

2012

J of Applied Polymer Sci

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“…A better understanding of how co‐neutralization impacts the microstructure and phase behavior of ionomers is critical to further optimize performance. However, although there are many studies on the structure of ionomers neutralized by a single metal, the authors have found only a few studies dedicated to structure changes induced by co‐neutralization 13–16 …”

Section: Introductionmentioning

confidence: 99%

Influence of co‐neutralization by sodium and zinc on the ethylene ionomer structure and properties

Nagayama

Morris

Matsuba

et al. 2022

J of Applied Polymer Sci

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This study investigates the properties and structure of poly(ethylene‐co‐methacrylic acid) (EMAA) ionomers co‐neutralized by zinc and sodium, and compares them with ionomers neutralized by a single metal: zinc (EMAA‐Zn) and sodium (EMAA‐Na). The bending stiffness and the degree of crystallization for the co‐neutralized ionomer (Na:Zn = ~1:1 on a molar basis) gives 16.5% and 9.8% increase compared to the simple average of their single cation counterparts. Such unusual properties are seen in mechanical, thermal, and rheological properties and water uptake rate in this study. Infrared spectra of the co‐neutralized ionomer shows changes at the carboxylate antisymmetric stretching band, which correspond to the formation of carboxylates bridging zinc and sodium ions. X‐ray scattering identified that the number density of ionic multiplets for the co‐neutralized ionomers are equivalent to EMAA‐Na and ~ 1.7 times higher than EMAA‐Zn. The fraction of side groups forming ionic multiplets, β, in co‐neutralized ionomers were 0.7–0.8, close to EMAA‐Na (1.0) and higher than EMAA‐Zn (0.3), indicating that sodium promote zinc to form ionic multiplets. The synergistic properties induced by co‐neutralization are ascribed not only to a formation of new ionic multiplets where both cations are included but also to the change in the number density of ionic multiplets.

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“…The specific metal−ligand coordination can be formed, and even more than one interaction exists in the hybrid polymer system. Nishio et al 25 measured the melt viscosities of ethylene−methacrylic acid ionomers neutralized with binary metal cations. Leibler et al 26 designed polymers with suitable viscoelasticity and self-healing capabilities by the reversible transesterification of epoxy−acid and epoxy−anhydride networks.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the Viscoelasticity of HEMA-Functionalized Styrene-Acrylate Copolymers Using Coagulants

Jiang

Guan

et al. 2014

Ind. Eng. Chem. Res.

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Coagulation is an important chemical process extensively used to harvest polymeric resins from natural or synthesized suspensions and emulsions. In this work, the coagulants were found effective to tune the viscoelasticity of poly(styrene-co-butyl acrylate) resins containing small amounts of hydroxyethyl methacrylate (HEMA) and methacrylic acid (MAA). Results showed that the viscoelasticity of the copolymers remarkably varied with the type of coagulant. For samples coagulated by H 2 SO 4 , the shear modulus G′ initially decreased and then rapidly increased with temperature. This observation suggested a cross-linking reaction during rheological measurement. Conversely, G′ continuously decreased with increased temperature and exhibited a higher solidlike plateau in the terminal zone for resins coagulated by metal salts with a higher charge/radius ratio. We demonstrated that the cross-linking reaction originated from the transesterification of the hydroxyl group with the ester group both from BA. Cations from the metal salts formed coordination bonds with HEMA hydroxyl during coagulation. These bonds shielded HEMA from transesterification reactions but resulted in physical networking among the copolymer chains.

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Rheological properties of ethylene ionomer neutralized with binary metal cation

Cited by 19 publications

References 11 publications

Tailoring the ionic association and microstructure of ionomers with various metal salts

Tailoring the ionic association and microstructure of ionomers with various metal salts

Influence of co‐neutralization by sodium and zinc on the ethylene ionomer structure and properties

Tailoring the Viscoelasticity of HEMA-Functionalized Styrene-Acrylate Copolymers Using Coagulants

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