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Frohne, H.; Yan, Shouke; Rogausch, K. D.; Karbach, A.; Petermann, J.

doi:10.1023/a:1010952813659

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Highly oriented poly(tetrafluoroethylene) (PTFE) films were produced by sliding a bar of commercial grade PTFE on glass slides at 200 °C. Details of the friction transfer method can be found in the literature 94, 95…”

Section: Methodsmentioning

confidence: 99%

Can the Structures of Semicrystalline Polymers be Controlled Using Interfacial Crystallographic Interactions?

Zhou¹,

Yan²

2012

Macro Chemistry & Physics

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Front Cover: By controlling the fi lm thickness, non-birefringent and birefringent concentric ring-banded spherulites can be obtained in poly(L-lactic acid) (PLLA), melt-crystallized at 112 °C, for fi lm thicknesses of 350 nm up to 2000 nm, respectively. The nanoscale morphology in these unconventional ring bands is infl uenced further by the different lamellar arrangements across the bands. Further details can be found in the article by S. Nurkhamidah and E. M. Woo* on page 673.Articles published on the web will appear several weeks before the print edition. They are available through: wileyonlinelibrary.com

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Section: Methodsmentioning

confidence: 99%

Can the Structures of Semicrystalline Polymers be Controlled Using Interfacial Crystallographic Interactions?

Zhou¹,

Yan²

2012

Macro Chemistry & Physics

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“…Friction transfer or mechanical rubbing processes provides also nice way to fabricate highly oriented polymer thin films. [9,[54][55][56][57][58] As presented in Figure 8a, the friction transfer process is realized by moving a solid polymer bar against a smooth counterface (usually glass slide) under certain pressure at controlled rate and temperature. After the sliding, a highly oriented thin polymer layer leaves on the substrate surface.…”

Section: Friction Transfer and Mechanical Rubbing Processesmentioning

confidence: 99%

Preparation and Self‐Repairing of Highly Oriented Structures of Ultrathin Polymer Films

Xin

Hou

et al. 2019

Macro Chemistry & Physics

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Thin and ultrathin polymer films play an important role in a variety of applications, such as electronics, liquid crystal alignment, adhesion, and so on. It is well established that the properties of semicrystalline polymeric materials depend remarkably on their multiscale structures; for example, an increase of more than a factor of 100 has been reported for the electrical conductivity of doped and aligned conjugated macromolecules compared with their nonoriented counterparts. Consequently, sophisticated methods have been developed for preparing highly oriented polymer ultrathin films. It should be pointed out that the highly oriented crystalline structure of polymers can be maintained only at temperatures below their melting points. Otherwise, structure rearrangement will result in the loss of orientation and therefore the properties. Therefore, self‐repairing of highly oriented polymer structures is of great significance for the long‐term application of polymer thin films in some specific fields. In this review paper, the preparation and self‐repair of the highly oriented structure of polymer thin films is described in the hopes that this will afford useful information for further development of polymeric materials for advanced applications.

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Structure characterization of melt drawn polyethylene ultrathin films

et al. 2006

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Highly oriented ultrathin polyethylene (PE) films were prepared by a melt-draw technique. Transmission electron microscopy study on the obtained ultrathin films indicates that the melt drawn PE thin films consist of highly oriented edge-on lamellae aligned perpendicular to the drawing direction. Electron diffraction confirms that the PE chains in crystalline phase are highly oriented in film plane along the drawing direction, while only a random orientation of the crystallographic a-and b-axes can be described through electron diffraction. The IR results on the melt-drawn ultrathin PE films demonstrate that the PE molecular chains in both crystalline and amorphous phases of the melt drawn thin films are well oriented along the drawing direction. Moreover, the IR results indicate that in the crystalline phase, the crystallographic b-axis tend to lie in the thin film plane, while in the amorphous phase, the skeleton plane of some local chains prefers to parallel the film plane. The alignment of b-axis of PE crystals in ultrathin films originates from the fact that the b-axis is the fastest growth direction of the PE crystals.The technological significance of the highly oriented polymer materials derives from the fact that the properties of the oriented materials may exceed those of their isotropic species by general orders of magnitude. For example, the stiffness and strength of highly oriented crystalline polymers [1,2] can increase to a factor of 100 compared with their non-oriented counterparts. Therefore, highly oriented polymer materials have received considerable interest in the past few decades. Generally, in most polymer processing operations, such as fiber spinning and extrusion, etc., the molten polymer is exposed to varying levels of flow fields, which encourage the development of high degree of orientation. For these products, wide-and small-angle X-ray scatterings are frequently used for characterizing their morphological information. Moreover, skillful experimental techniques for producing highly oriented ultrathin polymer films, such as drawing from the thin polymer melts [3] and frictions from the solid blocks [4,5] , enable us to produce thin films of tens nanometers, which are ideal for real space morphology as well as electron diffraction studies on themselves, as substrate inducing crystallization of other polymers. Consequently, a large number of investigations have been done to characterize the morphological and orientational features of oriented thin polymer films. It should be pointed out that, however, the information about chain orientation given by electron and X-ray diffractions is only related to the chains in crystalline region of the semicrystalline polymers. To our knowledge, the alignment of the chains in the amorphous areas of the highly oriented thin films is hardly concerned so far.Infrared spectroscopy (IR) is sensitive to both chain conformation and molecular environment. Fourier transform infrared spectroscopy combining with polarized infrared beam is a powerful tool to probe ...

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Untitled

Cited by 3 publications

References 10 publications

Can the Structures of Semicrystalline Polymers be Controlled Using Interfacial Crystallographic Interactions?

Can the Structures of Semicrystalline Polymers be Controlled Using Interfacial Crystallographic Interactions?

Preparation and Self‐Repairing of Highly Oriented Structures of Ultrathin Polymer Films

Structure characterization of melt drawn polyethylene ultrathin films

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