Epitaxial crystallization of polyoxymethylene in the course of polymerization in aqueous solution

Takahashi, T.; Ogata, Naoya

doi:10.1002/pol.1971.110091205

Cited by 20 publications

(5 citation statements)

References 3 publications

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“…With 6.50 × 10 −2 wt.‐% of Au, no peak was found. A few authors have reported26,27 that some fillers such as talc and calcium carbonate could act as nucleating agents for polypropylene, and nucleation was better when the fillers had a fine particulate form and particle size. The possible reason for the disappearance of the endothermic peaks for the nanocomposites with 6.50 × 10 −2 wt.‐% Au is that the Au content higher than 4.35 × 10 −2 wt.‐% results in nanoparticle aggregation.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Thermal and Mechanical Properties in Polyurethane/Au Nanocomposites

Hsu

Chou

Tseng³

2004

Macro Materials & Eng

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Summary: We have prepared waterborne polyurethane (WBPU) thin films containing gold nanoparticles by casting WBPU/Au solutions. The effect of the Au nanoparticle contents on the microstructure and properties of the composite films was investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), field emission scanning electron microscopy (FESEM), transmittance electron microscopy (TEM), FTIR spectroscopy (FTIR) and dynamic mechanical analysis (DMA). The Au nanoparticles initially in the WBPU solution were well dispersed in the WBPU films cast and dried at 60 °C. The thermostability and mechanical properties of the polymer increased with Au contents up to 4.35 × 10−2 wt.‐%, which was believed to be a result of induced crystallization in the presence of Au nanoparticles. The Au/WBPU nanocomposite containing with 6.5 × 10−2 wt.‐% of Au resulted in the aggregation of Au particles, which leads to a worsening of the thermal and mechanical properties.

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Section: Resultsmentioning

confidence: 99%

Enhanced Thermal and Mechanical Properties in Polyurethane/Au Nanocomposites

Hsu

Chou

Tseng³

2004

Macro Materials & Eng

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“…Two kinds of mutual chain orientations of the deposited polymers with respect to that of the substrates were manifested for polymer epitaxies. They are (i) the parallel chain alignment of epitaxial pairs ,− and (ii) the deposited polymer chains at fixed angles from the substrate molecular chains. ,,,, Parts a and b of Figure present a most illustrative example of the different chain orientation of PE grown epitaxially on melt-drawn uniaxially oriented isotactic polypropylene (iPP) and friction transfer oriented poly(tetrafluoroethylene) (PTFE) substrates, respectively. While the epitaxy results in the molecular chains of PE ± 50° apart from the chain direction of iPP substrate crystals, producing a crosshatched lamellar structure of PE, a parallel chain alignment is identified for the PE/PTFE system, which induces a parallel aligned lamellar structure of PE.…”

Section: Flat-surface-induced Polymer Crystallizationmentioning

confidence: 99%

“…Two kinds of mutual chain orientations of the deposited polymers with respect to that of the substrates were manifested for polymer epitaxies. They are (i) the parallel chain alignment of epitaxial pairs 110,[120][121][122][123][124] and (ii) the deposited polymer chains at fixed angles from the substrate molecular chains. 91,108,110,112,125 Parts a and b of Figure 3 present a most illustrative example of the different chain orientation of PE grown epitaxially on melt-drawn uniaxially oriented isotactic polypropylene (iPP) and friction transfer oriented poly(tetrafluoroethylene) (PTFE) substrates, respectively.…”

Section: Flat-surface-induced Polymer Crystallizationmentioning

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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“…Figure 7 and 8 show typical examples indicating the successful control of the chain orientation of the deposit polymer through epitaxy caused by a unique crystallographic interaction. Generally, the mutual chain orientation of epitaxial polymers can be divided into two categories, parallel chain epitaxy103, 104, 108–111, 115–117 and non‐parallel chain epitaxy with the deposited polymer chain at a fixed angle deviating from the molecular chain axis of the substrate polymer 102, 106–108, 112–114, 118–125. Table 1 and 2 list the known parallel and non‐parallel epitaxial polymer systems reported in the literature to date.…”

Section: Structure Control Through Interfacial Crystallographic Inmentioning

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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Epitaxial crystallization of polyoxymethylene in the course of polymerization in aqueous solution

Cited by 20 publications

References 3 publications

Enhanced Thermal and Mechanical Properties in Polyurethane/Au Nanocomposites

Enhanced Thermal and Mechanical Properties in Polyurethane/Au Nanocomposites

Surface-Induced Polymer Crystallization and the Resultant Structures and Morphologies

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

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