Crystal Growth of Polymers in Thin Films

Izumi, Kunihide; Gan, Ping; Hashimoto, Masato; Toda, Akihiko; Miyaji, Hideki; Miyamoto, Yoshihisa; Nakagawa, Y.

doi:10.1016/b978-0-444-82504-9.50027-5

Cited by 8 publications

(18 citation statements)

References 14 publications

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“…The crystal grown in 11nm-thick films ( Fig.1 c), also consists of many branches, however it has an almost hexagonal average front similar to the compact dendrite (CD) [12,13]. Below about 8 nm , the average front is triangular rather than hexagonal; it is to be noted that it-PS has the trigonal crystal structure [1]. There is little material left between the branches developed.…”

Section: Resultsmentioning

confidence: 99%

“…Amorphous regions around the crystals close to the growth interface is always thinner by several nanometers than the region far from the interface(original thickness); we call hereafter this region "halo", named after the bright region in TEM images [1]. A few nm-thick amorphous layer covers the surface of these lamellae, including lateral growth surface [9,10].…”

Section: Resultsmentioning

confidence: 99%

“…The crystal growth rate is reduced in thin films [7,8,1,2,4,6]. For isotactic polystyrene (it-PS), the thickness dependence of the growth rate down to 20nm was found to be expressed as follows ,…”

Section: Introductionmentioning

confidence: 99%

“…Crystal growth of polymers in thin films has recently studied on morphology and growth rate [1,2,3,4,5,6]. The crystal growth rate is reduced in thin films [7,8,1,2,4,6].…”

Section: Introductionmentioning

confidence: 99%

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Crystal Growth of Isotactic Polystyrene in Ultrathin Films: Film Thickness Dependence

Taguchi

Miyaji

Izumi

et al. 2002

Journal of Macromolecular Science, Part B

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The film thickness dependence of crystal growth is investigated for isotactic polystyrene (it-PS) in thin films, the thickness of which is from 20nm down to 4nm. The single crystals of it-PS grown at 180 in the ultrathin films show the morphology typical in the diffusion-controlled growth: dense branching morphology (DBM), fractal seeweed (FS). The characteristic length of the morphology, i.e. the width of the branch, increases with decreasing film thickness. The thickness dependence of the growth rate of crystals shows a crossover around the lamellar thickness of the crystal, 8 nm. The thickness dependences of the growth rate and morphology are discussed in terms of the diffusion of chain molecules in thin films.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Crystal growth of polymers in thin films has recently studied on morphology and growth rate [1,2,3,4,5,6]. The crystal growth rate is reduced in thin films [7,8,1,2,4,6].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crystal Growth of Isotactic Polystyrene in Ultrathin Films: Film Thickness Dependence

Taguchi

Miyaji

Izumi

et al. 2002

Journal of Macromolecular Science, Part B

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“…• C two dimensional spherulites [4,5]. Although the morphology is unchanged, the growth rates have been observed to decrease in thin films.…”

Section: Introductionmentioning

confidence: 99%

Growth shape of isotactic polystyrene crystals in thin films

Taguchi

Miyaji

Izumi

et al. 2001

Polymer

182

168

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The crystal growth of isotactic polystyrene (it-PS) is investigated in very thin, 11 nm thick films. The it-PS crystals grown in the thin films show quite different morphology from that in the bulk. With decreasing crystallization temperature, the branching morphology in a diffusion field appears: dendrite and compact seaweed. The branching morphology is formed through a morphological instability caused by the gradient of film thickness around a crystal; the thicker the film thickness, the larger the lateral growth rate of crystals. Regardless of the morphological change, the growth rate as well as the lamellar thickness depends on crystallization temperature as predicted by the surface kinetics.

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Direct melt crystal growth of isotactic polybutene‐1 trigonal phase

Yamashita

Ueno

2007

Cryst. Res. Technol.

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The morphology, crystalline structure and crystal growth kinetics of melt-crystallized thin isotactic polybutene-1 films have been studied with transmission electron microscopy, electron diffraction and optical microscopy. It is demonstrated that a bypass of tetragonal phase crystallization and direct melt crystal growth of the trigonal phase can be achieved via self-seeding at atmospheric pressure using solution-grown trigonal crystals as nuclei. Electron microscopy and optical microscopy observations show that melt-crystallized isotactic polybutene-1 single crystals of the trigonal phase have rounded or hexagonal morphologies around 75°C. The growth rate of trigonal crystals in the melt has been obtained by in-situ optical microscopy. The growth rate of trigonal crystals in the melt is 1/100 and 1/1000 that of tetragonal crystals in the melt around 70 and 90°C, respectively.

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Crystal Growth of Polymers in Thin Films

Cited by 8 publications

References 14 publications

Crystal Growth of Isotactic Polystyrene in Ultrathin Films: Film Thickness Dependence

Crystal Growth of Isotactic Polystyrene in Ultrathin Films: Film Thickness Dependence

Growth shape of isotactic polystyrene crystals in thin films

Direct melt crystal growth of isotactic polybutene‐1 trigonal phase

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