Disruption of the multiplets in poly(styrene-co-methacrylate) ionomers by the addition of aliphatic diacid salts

Kim, Jungwon; Kim, Joon‐Seop; Jarng, Soon-Suck

doi:10.1016/s0032-3861(02)00921-7

Cited by 10 publications

(2 citation statements)

References 22 publications

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“…This result indicates that a strong physical interaction of electrostatic attractive forces between ionic groups formed in the glassy regions [1, 24‐26]. However, the storage modulus for PET3i rapidly decreased with increasing temperature in the transition region, resulting from the dominated intramolecular ion association [25–27]. Han et al [25] reported that the existence of intramolecular ion‐pair associations in a polymer matrix generally assists in the collapse of the polymer chain due to the reduction of the radius of gyration and viscosity.…”

Section: Resultsmentioning

confidence: 99%

PET‐ionomers and PETi/MMT nanocomposites: A comparison of the effect of ionic groups on their crystallinities and physical properties

Hwang

2010

Polymer Composites

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Poly(ethylene terephthalate) (PET) and PET/modified montmorillonite (A10-MMT) nanocomposites containing up to 3 mol% of dimethyl 5-sulfoisophthalte sodium salt (DMSi) were prepared by in situ polymerization (PETi and PETNi, respectively). In results from transmission electron microscopy (TEM, 10 nm), clusters were observed with sizes of 30 nm at an ionic content of 3 mol%. Clusters were not observed in the PETNi samples due to the favorable interaction between the positively charged edges of the clay platelets and the negatively charged ionic groups. On the other hand, the degree of exfoliation was considerably improved by the small ionic content. Remarkable increases in the storage moduli of PETi and PETNi were also observed with increasing DMSi content in the glassy region. However, the storage modulus of PETi decreased rapidly in the rubbery region above the transition temperature as temperature increased. The dynamic viscosity of PETNi decreased with DMSi content, indicating that ionpair sites located at the clay edges acted as selective plasticizers in the PET ionic region. Moreover, the introduction of a small ionic content into the PET matrix led to a decrease in crystallinity and slower crystallization rates than in the pure PET. POLYM. COMPOS., 32:259-267, 2011. ª

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Section: Resultsmentioning

confidence: 99%

PET‐ionomers and PETi/MMT nanocomposites: A comparison of the effect of ionic groups on their crystallinities and physical properties

Hwang

2010

Polymer Composites

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“…From a chemical point of view, similar microwave absorption mentioned above could also be found in various ion‐containing polymers as some of them contain cationic dopants and anionic groups attached to the polymer backbone chain 8. For the last two decades, our group has studied the mechanical properties and morphology of polystyrene (PS)‐based ionomers 9–14. Very recently, in the course of the investigation of the formation of free radicals in the PS‐based ionomers, we observed with serendipity that the PS ionomers had the microwave absorption property 15.…”

Section: Introductionmentioning

confidence: 99%

Apparent low‐field microwave absorption properties of styrene‐based copolymers containing acid groups

Lee

Kim

2008

J of Applied Polymer Sci

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ABSTRACT:The microwave absorption properties of polystyrene (PS) copolymers containing sulfonic and methacrylic acid groups were investigated using an electron magnetic resonance spectroscopy method. It was found that, unlike PS and poly(methyl methacrylate) homopolymers, the acid groups containing PS copolymers showed three electromagnetic resonance signals at 3250, 3035, and 520 G; the first and last two signals were thought to be due to the presence of anion radicals and acid groups in PS, respectively. This result indicated that the PS copolymers exhibited magnetic field dependent low-field microwave absorption behavior. This also suggested that the low-field microwave absorption required the presence of both the aromatic and acidic groups in the materials. To explain both the low-field absorption and magnetic field dependence, we proposed a coupled mechanism including both the magnetoplasticity associated with a plastic deformation and the rotational degree of freedom of aromatic groups containing electric dipoles with natural spin defects.

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Ionomers

Kim¹

2005

Kirk-Othmer Encyclopedia of Chemical Technology

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Polymers containing ions can be classified into two major families: polyelectrolytes and ionomers. For polyelectrolytes, the ion content is very high, eg, every repeat unit of the polymer has pendent ionic groups. Thus, polyelectrolytes are water soluble. Ionomers are used to define the thermoplastic polymers, which contain a small amount of ionic groups in a matrix of low dielectric constants. Characterization of ionomers is discussed. The use of scattering and X‐ray absorption studies, electron microscopic studies, atomic force microscopy is discussed as ways to determine ionic aggregates and morphology of ionomers. Glass transitions are also studied in this category. Properties of styrene ionomers, as well as polyethylene and polytetrafluroethylene ionomers and ionomer blends are detailed. External polasticizers for ionomers can be used as additives to plasticize either polar or nonpolar regions, or both, depending on the polarities of the additives and the ionomer. Important applications of ionomers include membranes, molded materials, and as fertilizer coatings.

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Disruption of the multiplets in poly(styrene-co-methacrylate) ionomers by the addition of aliphatic diacid salts

Cited by 10 publications

References 22 publications

PET‐ionomers and PETi/MMT nanocomposites: A comparison of the effect of ionic groups on their crystallinities and physical properties

PET‐ionomers and PETi/MMT nanocomposites: A comparison of the effect of ionic groups on their crystallinities and physical properties

Apparent low‐field microwave absorption properties of styrene‐based copolymers containing acid groups

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