Time–electric field superposition in electrically activated polypropylene/layered silicate nanocomposites

Park, Jun Uk; Choi, Yang Suk; Cho, Kwang Soo; Kim, Do Hoon; Ahn, Kyung Hyun; Lee, Seung Jong

doi:10.1016/j.polymer.2006.05.018

Cited by 28 publications

(28 citation statements)

References 32 publications

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“…[2][3][4][5][6] However, few approaches are developed to control the spatial and oriented morphology of nanomaterials when compared with the conventional ways with fiber and weaving as additives. For example, with tuning effects of electric field, epoxy-layered silicate nanocomposite, [7][8][9][10] styrene-acrylonitrile copolymer/clay nanocomposite, 11 and polypropylene/layered silicate nanocomposites 12 have been recently prepared under an applied electric field.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characteristics of polystyrene–clay nanocomposites via in situ intercalative polymerization in a direct current electric field

Jin

Huang

2009

J of Applied Polymer Sci

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Section: Introductionmentioning

confidence: 99%

Synthesis and characteristics of polystyrene–clay nanocomposites via in situ intercalative polymerization in a direct current electric field

Jin

Huang

2009

J of Applied Polymer Sci

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“…Numerous studies confirmed the formation of columnar structures parallel to the applied field by nanolayered clay particles suspended in a nonconducting medium . The field‐induced structuring was also observed for polymer/organically modified silicate layers nanocomposite melts upon exposure to an external electric field of the order of ∼1 kV/mm . The ER response in polymer/organically modified silicate layers nanocomposites is marked by threefold increase in low‐frequency, melt‐state elastic properties of nanocomposite samples .…”

Section: Introductionmentioning

confidence: 71%

“…Apart from field‐induced alignment, various studies proved that external electric field is able to induce further intercalation in clay suspensions by breaking up the charge balance of silicate layers . Up to 0.8nm increase in basal spacing was observed for polypropylene/organically modified layered silicate nanocomposite sample under an AC electric field of 1 kV/mm and 60 Hz . The AC field was found to be effective in layer‐stacking destruction.…”

Section: Introductionmentioning

confidence: 99%

DC electrorheological response of polyethylene/organically modified layered silicate nanocomposites

Sadeghi

Arjmand

et al. 2017

J. Polym. Sci. Part B: Polym. Phys.

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The present work reports the electrorheological (ER) response of high-density polyethylene (HDPE)/organically modified silicate layers nanocomposites based on four commercially available HDPE matrices. Two single-site catalyzed bimodal resins, one single-site catalyzed unimodal resin and one Ziegler-Natta catalyzed unimodal resin are studied. It is revealed that the distinct separation of the two modes of the bimodal HDPE resins significantly enhances the ER response. It is proposed that the slower structural relaxation modes introduced by higher molecular weight species in the bimodal HDPE matrices enhance the ER response of the nanocomposites. This is ascribed to the longer induction time for leaking current density, which is an indicator of mobility and release of immobilized cationic surfactants at the silicate layers surface induced by field exposure. It is found that the screening effect of prematurely released cationic surfactants leads to a weaker ER response in nanocomposites whose matrices have faster relaxation modes.

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“…-P 10 Li and M // -P 10 Li were almost the same and were slightly higher than that of M ori -P 10 Li. Ahn and colleagues 20,21 have reported that the application of an electric field to polypropylene/organic-modified MMT (Cloisite 20A) composites causes not only orientation of the composites but also expansion of the layer spacing in the composites. In the case of M ?…”

Section: Resultsmentioning

confidence: 99%

“…The application of magnetic fields is known to be particularly attractive for orienting high-aspect-ratio materials, such as clays, fibers and polymers, and is practical because of its nondestructive nature compared with typical methods such as mechanical shearing 19 and the application of electric fields. 20,21 The magnetic field orientation of clays and other inorganic materials have been extensively reported by Uyeda et al [22][23][24] Kimura et al 25 have also shown the potential of magnetic fields in the photochemistry of Rhodamine B intercalated in various types of clays. However, there are no reports on the orientation of clays in polymer composites and in ion-conductive materials using magnetic fields.…”

Section: Introductionmentioning

confidence: 90%

Anisotropic ionic conduction in composite polymer electrolytes filled with clays oriented by a strong magnetic field

Kitajima

Matsuda

Yamato

et al. 2012

Polym J

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To utilize the fascinating properties of clays, including their large surface areas, many dissociable cations in the interlayers and low-dimensional structure, we focused on controlling the orientation of clay layers in ion-conductive polymer electrolytes. The application of a strong magnetic field is one of the effective methods used to control the orientation of clay layers and to improve the ionic conductivity of the clay composites. In this study, two different composite films were obtained using different orientations of the magnetic field: perpendicular (M ?) and parallel (M //) to the film surface. From two-dimensional wide-angle X-ray diffraction measurements, the montmorillonite (MMT) layers preferentially oriented along the direction of the magnetic fields in the composites. There were substantial correlations between the conductivity and the ratio of MMT layers oriented along the direction of the conductivity measurement. The lowest conductivity was observed in the M // composite, whereas the M ? composite showed very good conductivity. The value was higher than that of the original electrolytes (PMEO 10 LiClO 4) at 30 1C. These results clearly suggest that the orientation direction of the MMT layers toward the direction parallel to the conductivity measurement causes an improvement in the conductivity of the composites. In particular, the conductivity value of the M ? composite with 5 wt% Li-MMT was 1.2 Â 10 À5 S cm À1 at 30 1C, which was more than six times higher than the original electrolyte.

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Time–electric field superposition in electrically activated polypropylene/layered silicate nanocomposites

Cited by 28 publications

References 32 publications

Synthesis and characteristics of polystyrene–clay nanocomposites via in situ intercalative polymerization in a direct current electric field

Synthesis and characteristics of polystyrene–clay nanocomposites via in situ intercalative polymerization in a direct current electric field

DC electrorheological response of polyethylene/organically modified layered silicate nanocomposites

Anisotropic ionic conduction in composite polymer electrolytes filled with clays oriented by a strong magnetic field

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