Synthesis and properties of polyacetylene films prepared by soluble vanadium-based catalysts

Oh, Se‐Young; Akagi, Kazuo; Shirakawa, Hideki

doi:10.1016/0379-6779(89)90847-3

Cited by 17 publications

(4 citation statements)

References 12 publications

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“…On the other hand, the multiscale morphologies of the polymeric materials in the condensed state also exhibit pronounced influences on the mechanical and physical properties of the polymers. As examples, the stiffness and strength of highly oriented polymeric materials can exceed those of their isotropic counterparts by orders of magnitude, , while 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. − Among many others, further examples of improved performance of oriented polymeric materials are the enhanced thermal conductivity, optical transparency, and piezoelectric properties . For crystalline polymers, the crystalline structure and crystal orientation provide another most important key factor in regulating the property and/or even functionality of a polymer.…”

Section: Introductionmentioning

confidence: 99%

Surface-Induced Polymer Crystallization and the Resultant Structures and Morphologies

2011

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The dependence of properties on the structure and morphology of semicrystalline polymers offers an effective way to tailor the properties of these materials through crystal engineering. For purposeful control of the structure and morphology, and therefore the physical and mechanical properties, a full understanding of the crystallization habits of polymers under different environments and conditions is essential. This has stimulated a mass of research work on polymer crystallization. Considering that these materials are frequently in contact with some kinds of solid surfaces in a variety of applications, surfaceinduced crystallization of polymers has attracted considerable attention during the past decades. This Perspective provides the context as to how the solid surface influences the crystallization behavior of polymers and what kinds of unique crystal structure and morphology of the polymers can be fabricated. We hope that this will afford useful information for polymer processing in different application fields and promote the technical development of new methods of preparation of polymeric materials for advanced applications.

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Section: Introductionmentioning

confidence: 99%

Surface-Induced Polymer Crystallization and the Resultant Structures and Morphologies

2011

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“…The chain alignment of polymeric materials in the condensed state also has a remarkable influence on their properties. For example, an increase in the electrical conductivity of more than a factor of 100 was reported for doped and well‐aligned conjugated macromolecules when compared with their randomly oriented counterparts 6–8. For semicrystalline polymers, the multiscale structures have a pronounced influence on their properties and/or functionality.…”

Section: Introductionmentioning

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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“…The nucleation can take place either homogeneously or heterogeneously. Surface‐induced heterogeneous nucleation is most frequently encountered in many scientific and technical applications of polymers . It has been well demonstrated that the epitaxial crystallization of a polymer on an oriented surface provides an efficient way to fabricate highly oriented polymer thin films with controlled exposure plane and crystal modification .…”

Section: Techniques For Preparing Highly Oriented Polymer Thin Filmsmentioning

confidence: 99%

“…As examples, while the tensile strength of polyethylene (PE) can increase from 10 MPa for the non‐oriented sample to 3 GPa for the highly oriented one, an increase from 90 MPa to 90 GPa is seen in the modulus . Also 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 non‐oriented counterparts . Therefore, processing of highly oriented structure of polymers has drawn much attention.…”

Section: Introductionmentioning

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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Synthesis and properties of polyacetylene films prepared by soluble vanadium-based catalysts

Cited by 17 publications

References 12 publications

Surface-Induced Polymer Crystallization and the Resultant Structures and Morphologies

Surface-Induced Polymer Crystallization and the Resultant Structures and Morphologies

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

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

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