Three-dimensional shape of polyethylene single crystals grown from dilute solutions and from the melt

Toda, Akihiko; Okamura, Mari; Hikosaka, Masamichi; Nakagawa, Y.

doi:10.1016/j.polymer.2005.05.152

Cited by 36 publications

(33 citation statements)

References 20 publications

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“…[1] The study of single crystals during the early stage of crystallization is very important to understanding of the mechanism of polymer crystallization in general, because it will make clear the crystalline structure, the mechanism of crystal growth, and the origin of the superstructure, such as screw dislocations, branching, etc. [1][2][3][4] Isotactic polypropylene (iPP) is one of the most common polymers. However, there have been few studies on the single crystals of iPP.…”

Section: Introductionmentioning

confidence: 99%

Morphology and Growth of Single Crystals of Isotactic Polypropylene from the Melt

Yamada

Kajioka

Nozaki

et al. 2010

Journal of Macromolecular Science, Part B

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Isolated single crystals of isotactic polypropylene (iPP) grown from the melt were studied by optical microscopy and atomic force microscopy (AFM). The single crystals had a well-known rectangular shape when crystallized at high temperatures (T c ) above 155 • C. The width increased with decreasing T c , and the shape became hexagonal below 130 • C. The single crystals were sectored with thickness difference between them. The growth rate along the a * -axis, G a * , agreed well with the growth rate of spherulites, as expected. G a * had two inflection points on the plots against (T T) −1 . The lower temperature inflection corresponds to the regime II-III transition, and the higher temperature one is accompanied by an inflection of the growth rate in the b-axis direction, G b , which has been measured for the first time. The inflection of G b at the lower inflection temperature of G a * was much smaller than that of G a * and may not exist. The crystals are basically surrounded with flat surfaces and no indications of kinetic roughening in the regime III were recognized in the AFM images. The inflections of G a * and G b caused a complicated shape change of the aspect ratio, having a minimum at around 135 • C.

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Section: Introductionmentioning

confidence: 99%

Morphology and Growth of Single Crystals of Isotactic Polypropylene from the Melt

Yamada

Kajioka

Nozaki

et al. 2010

Journal of Macromolecular Science, Part B

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“…Acid Value of PE Wax. Even though the morphology of single lamella has been extensively studied from the dilute solution and the melt [31,32], self-assembly of PE wax having broad molecular weight distribution from a nondilute solution has been rarely studied, in particular, not for partially oxidized PE wax. The oxidation degree of PE wax can be defined by acid value where PE wax possesses oxygencontaining functional groups such as carboxyl, hydroxyl, and carbonyl, expecting reduction in crystallinity of selfassembled structures.…”

Section: Resultsmentioning

confidence: 99%

“…Spherulite structure with few tens micron in size can be obtained from its melt state by a cooling process which originated from stacking of lamellae with interlamellar thickness of~12 nm [31]. Single lamella was obtained from cooling of hot and dilute PE in various solvents [32]. Recently, we found that PE wax could form micronsized ellipsoidal granule composed of multilamellae from a concentrated solution by controlling a cooling rate [33].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Hollow Silica Particles Using a Self-Assembled Polyethylene Granule as a Template

Park

Kim

Yoo

et al. 2018

Journal of Nanomaterials

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We developed a novel method preparing nonspherical hollow silica particles (HSP) using a micron-sized granule self-assembled from partially oxidized PE wax. The morphology of the granule was closely investigated in terms of concentration and acid value of PE wax and cooling rate. Due to the oxidized unit in PE wax, magnetic nanoparticle was incorporated into the granule during the self-assembly, and silica was coated on the granule surface via the self-assembly. Silica-coating condition was studied by varying water content and reaction time. After the PE wax was removed by calcination, nonspherical HSP or magnetic HSP was obtained. This cost-effective HSP is expected to be useful for practical applications.

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“…[134]. In terms of the introduction of screw dislocations, Schultz and Kinloch [135,136] already recognized many years ago (see, for example, a review in Geil's book [132], also a discussion on dislocations in polymer crystals [142].…”

Section: Dislocations In Crystal Plasticitymentioning

confidence: 99%

Nano- and Micromechanics of Crystalline Polymers

Gałęski¹,

Régnier²

2009

Nano- And Micromechanics of Polymer Blends and Composites

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Three-dimensional shape of polyethylene single crystals grown from dilute solutions and from the melt

Cited by 36 publications

References 20 publications

Morphology and Growth of Single Crystals of Isotactic Polypropylene from the Melt

Morphology and Growth of Single Crystals of Isotactic Polypropylene from the Melt

Fabrication of Hollow Silica Particles Using a Self-Assembled Polyethylene Granule as a Template

Nano- and Micromechanics of Crystalline Polymers

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