Dielectric Properties of Poly(enaminonitrile)s

Kim, Ji‐Heung; Kim, Sang Youl; Moore, James A.; Mason, J. F.

doi:10.1295/polymj.32.57

Cited by 16 publications

(17 citation statements)

References 4 publications

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“…The short crystallization times typical of electrospinning lead to the assumption that the crystallites have a tendency to be small and to contain defects; furthermore, the degree of crystallization may be reduced. [303] In the case of PLA, it was observed that the degree of crystallinity and the melting point of the electrospun fibers were very similar to those of macroscopic samples. For instance, in the cases of nanofibers of PET, poly(ethylene naphthalate), and mixtures of the two, the melting points are not changed by the processing into nanofibers.…”

Section: Nanofiber Morphologiesmentioning

confidence: 87%

“…[303] Blend fibers are generally fabricated by electrospinning ternary solutions of two polymers and a solvent. To be able to interpret the properties of the fibers produced by melt electrospinning, it is necessary to determine whether the blend components have undergone a chemical reaction, either during blending or during the electrospinning process.…”

Section: Melt-electrospun Polymersmentioning

confidence: 99%

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Electrospinning: A Fascinating Method for the Preparation of Ultrathin Fibers

2007

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Electrospinning is a highly versatile method to process solutions or melts, mainly of polymers, into continuous fibers with diameters ranging from a few micrometers to a few nanometers. This technique is applicable to virtually every soluble or fusible polymer. The polymers can be chemically modified and can also be tailored with additives ranging from simple carbon-black particles to complex species such as enzymes, viruses, and bacteria. Electrospinning appears to be straightforward, but is a rather intricate process that depends on a multitude of molecular, process, and technical parameters. The method provides access to entirely new materials, which may have complex chemical structures. Electrospinning is not only a focus of intense academic investigation; the technique is already being applied in many technological areas.

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Section: Nanofiber Morphologiesmentioning

confidence: 87%

Section: Melt-electrospun Polymersmentioning

confidence: 99%

Electrospinning: A Fascinating Method for the Preparation of Ultrathin Fibers

2007

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“…These characteristics are essential for various practical applications such as separation membranes, wound dressing materials, artificial blood vessels, sensors, composite reinforcements, and so forth. [1][2][3][4][5] In electrospinning, polymer solution or melt is placed in a container that has a millimeter size capillary.…”

Section: Introductionmentioning

confidence: 99%

Electrospinning of ultrafine cellulose acetate fibers: Studies of a new solvent system and deacetylation of ultrafine cellulose acetate fibers

Son

Youk

Lee

et al. 2003

J Polym Sci B Polym Phys

233

125

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Electrospinning of cellulose acetate (CA) in a new solvent system and the deacetylation of the resulting ultrafine CA fibers were investigated. Ultrafine CA fibers (∼2.3 μm) were successfully prepared via electrospinning of CA in a mixed solvent of acetone/water at water contents of 10–15 wt %, and more ultrafine CA fibers (0.46 μm) were produced under basic pH conditions. Ultrafine cellulose fibers were regenerated from the homogeneous deacetylation of ultrafine CA fibers in KOH/ethanol. It was very rapid and completed within 20 min. The crystal structure, thermal properties, and morphology of ultrafine CA fibers were changed according to the degree of deacetylation, finally to those of pure cellulose, but the nonwoven fibrous mat structure was maintained. The activation energy for the deacetylation of ultrafine CA fibers was 10.3 kcal/mol. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 5–11, 2004

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“…Recently, Kim et al investigated the dynamic mechanical properties of poly(styrene-co-itaconate) 9 and poly(styrene-co-citraconate) 10 ionomers, both of which have two ion pairs in one ionic repeat unit. They found that the two ionomer systems show only very weak clustering and suggested that the polymer chains, where ionic groups are attached, experience steric hindrance when the ionic groups form multiplets and, thus, form only a few multiplets, leading to weak clustering.…”

Section: Introductionmentioning

confidence: 99%

Effects of Low Matrix Glass Transition Temperature on the Cluster Formation of Ionomers Having Two Ion Pairs per Ionic Repeat Unit

Kim

2003

Macromolecules

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The dynamic mechanical properties and morphology of novel ethyl acrylate ionomers, poly-(ethyl acrylate-co-itaconate) [P(EA-co-ITA)], were investigated. It was found that the P(EA-co-ITA) ionomers showed a well-developed cluster loss tangent peak, which was not seen in poly(styrene-coitaconate) ionomers. This is probably due to the low matrix Tg of the PEA ionomers, which allows ITA units to form a significant number of multiplets, leading to high clustering. The large difference in the matrix and cluster T g's was also observed; this is mainly due to two factors. First, the presence of two ion pairs in an ionic repeat unit makes ion-hopping difficult, resulting in higher cluster Tg. Second, the clustering induced by the low matrix Tg naturally increases the cluster Tg. It was also found that the clustering degree was weaker for the itaconate ionomers than for the acrylate ionomers, which is probably due to the fact that the presence of two ion pairs in one ITA unit is more effective in stiffening polymer chains compared to the case of acrylate ionomers. In an SAXS study, an ionomer peak was observed, and the position of the peak shifted to slightly higher angle with increasing ion content, implying that more multiplets form with increasing ion content.

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Dielectric Properties of Poly(enaminonitrile)s

Cited by 16 publications

References 4 publications

Electrospinning: A Fascinating Method for the Preparation of Ultrathin Fibers

Electrospinning: A Fascinating Method for the Preparation of Ultrathin Fibers

Electrospinning of ultrafine cellulose acetate fibers: Studies of a new solvent system and deacetylation of ultrafine cellulose acetate fibers

Effects of Low Matrix Glass Transition Temperature on the Cluster Formation of Ionomers Having Two Ion Pairs per Ionic Repeat Unit

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