Kaneka Americas Holding Inc.

College Station, TX, United States

Kaneka Americas Holding Inc.

College Station, TX, United States
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A composition including a medium and surfactant-free nanoparticles (SFNPs) at different dispersion state or aggregation form. The composition includes: (a) a composition of a medium and surfactant-free nanoparticles in primary form, wherein the dielectric constant value (DE value) of the medium is equal to or larger than the intrinsic dielectric constant value (IDE) of the SFNPs and smaller than about 1.5 times of the IDE of the SFNPs; (b) a composition of a medium and reaction-limited aggregation form of SFNPs, wherein the DE value of the medium is much larger than the IDE of the surfactant-free nanoparticles; (c) a composition of a medium and diffusion-limited aggregation form of SFNPs, wherein the DE value of the medium is smaller than the IDE of the surfactant-free nanoparticles; and (d) a composition comprising redispersible aggregation form of surfactant-free nanoparticles, wherein the surfactant-free nanoparticles are induced to aggregate in the diffusion-limited fashion in a medium with a DE value that is smaller than the IDE of the surfactant-free nanoparticles.


Wei J.,Jilin University | Liang B.,Jilin University | Duan R.,CAS Institute of Chemistry | Cheng Z.,Jilin University | And 4 more authors.
Angewandte Chemie - International Edition | Year: 2016

The design and preparation of metal-free organic materials that exhibit room-temperature phosphorescence (RTP) is a very attractive topic owing to potential applications in organic optoelectronic devices. Herein, we present a facile approach to efficient and long-lived organic RTP involving the doping of N-phenylnaphthalen-2-amine (PNA) or its derivatives into a crystalline 4,4′-dibromobiphenyl (DBBP) matrix. The resulting materials showed strong and persistent RTP emission with a quantum efficiency of approximately 20 % and a lifetime of a few to more than 100 milliseconds. Bright white dual emission containing blue fluorescence and yellowish-green RTP from the PNA-doped DBBP crystals was also confirmed by Commission Internationale de l'Eclairage (CIE) coordinates of (x=0.29–0.31, y=0.38–0.41). © 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim


Furutani H.,Kaneka Americas Holding Inc | Tsuji H.,Kaneka Corporation | Sogabe K.,Kaneka Techno Research Corporation
Polymer Journal | Year: 2017

Evidence for the Higgs boson, for which the Nobel Prize in physics was awarded in 2013, was discovered by the European Organization for Nuclear Research (CERN) in 2012, using the Large Hadron Collider (LHC). PIXEO BP-S exhibited superior resistance to both radiation and cryogenics and this polymer played a crucial role in the operation of the LHC, thus contributing to the Higgs boson discovery. Herein, we report the synthesis and characterization of various polyester imides for a cryogenic and radiation-resistant polyimide adhesive tape. These polyester imides (3) were synthesized from 2,2-bis(4-hydroxyphenyl)propanedibenzoate-3,3′,4,4′ -tetracarboxylic acid anhydride (ESDA) and various diamines (1a-1l). All polymers showed high solubility in various solvents, especially 3a, which was synthesized from ESDA and 4,4′ -bis(3-aminophenoxy)diphenyl sulfone and dissolved even in ether solvents such as dioxane and dioxolane. Dynamic mechanical analysis and X-ray diffraction studies indicated that the excluded volume of the polyester imides had a length of 150 Å, and that this volume affected the thermoplastic properties and solubilities of the polymers. The degree of imidization of 3a dissolved in dimethyl sulfoxide was examined by 1H-Nuclear magnetic resonance(NMR) imaging utilizing a 15 N-enriched amine model compound in conjunction with 1H-15N heteronuclear single quantum coherence 2-dimensional NMR and was found to be 99.5%. © 2017 The Society of Polymer Science, Japan (SPSJ). All rights reserved.


Hossain M.M.,Texas A&M University-Kingsville | Xiao S.,Texas A&M University | Sue H.-J.,Texas A&M University | Kotaki M.,Kaneka Americas Holding Inc.
Materials and Design | Year: 2017

A three-dimensional finite element method modeling along with experimental study on multilayer acrylic coating systems on a hard and brittle substrate has been performed to understand their scratch-induced deformation and damage mechanisms. The experimental results show that, while all else kept the same, an increase in soft (i.e., low Young's modulus and low strength) base layer thickness or hard (i.e., high Young's modulus and high strength) top layer thickness improve the scratch resistance of brittle coating systems by delaying the onset of cracking. The onset of plowing is delayed with the increase in hard top layer thickness, whereas increase in soft base layer thickness results in an earlier onset of plowing. The numerical analysis of the stress and strain field explains the mechanics behind the observed scratch behavior in the multilayer coating systems. The study provides insights toward designing scratch-resistant multilayer coating systems. © 2017 Elsevier Ltd


Mantaranon N.,Chulalongkorn University | Kotaki M.,Kaneka Americas Holding Inc. | Kotaki M.,Kyoto Institute of Technology | Lim C.T.,National University of Singapore | Chirachanchai S.,Chulalongkorn University
RSC Advances | Year: 2016

Polyoxymethylene (POM) is an engineering plastic which tends to release formaldehyde under a melt-mixing process. The present work proposes a simple way to control the formaldehyde generation by a reactive blending with bisphenol-A and amine to form in situ benzoxazines via the Mannich reaction. Further thermal treatment leads to partial conversion of benzoxazines (BA-a) to polybenzoxazines (poly(BA-a)) and the POM-poly(BA-a) obtained is under a semi-interpenetrating network. At that time, the BA-a and poly(BA-a) reached the amorphous phase to induce an increase in elongation at break. When POM blends were electrospun, the molecular orientation of POM was induced and this synergistically functions with the poly(BA-a) network, resulting in an increase in tensile strength which never occurs in the bulk material. The present work shows, for the first time, not only reactive blending as a way to control the formaldehyde generation of POM but also an in situ semi-interpenetrating network as an approach to fine tune the properties of POM. © 2016 The Royal Society of Chemistry.


PubMed | Jilin University, Kaneka Americas Holding Inc. and CAS Institute of Chemistry
Type: Journal Article | Journal: Angewandte Chemie (International ed. in English) | Year: 2016

The design and preparation of metal-free organic materials that exhibit room-temperature phosphorescence (RTP) is a very attractive topic owing to potential applications in organic optoelectronic devices. Herein, we present a facile approach to efficient and long-lived organic RTP involving the doping of N-phenylnaphthalen-2-amine (PNA) or its derivatives into a crystalline 4,4-dibromobiphenyl (DBBP) matrix. The resulting materials showed strong and persistent RTP emission with a quantum efficiency of approximately 20% and a lifetime of a few to more than 100 milliseconds. Bright white dual emission containing blue fluorescence and yellowish-green RTP from the PNA-doped DBBP crystals was also confirmed by Commission Internationale de lEclairage (CIE) coordinates of (x=0.29-0.31, y=0.38-0.41).


Li P.,Texas A&M University | Wong M.,Texas A&M University | Zhang X.,Kaneka Americas Holding Inc. | Yao H.,Texas A&M University | And 5 more authors.
ACS Photonics | Year: 2014

A direct colloidal self-assembly approach was utilized to prepare photonic crystals based on exfoliated graphene oxide (GO) in aqueous solution. The GO sheets form ordered photonic structure spontaneously without the need for multiple processing steps. The wavelength of light reflected by the GO photonic crystal dispersion can be controlled over the entire visible light spectrum simply by varying the GO concentration. The aspect ratio of the GO sheets and mediation of the intersheet forces are found to be the key factors influencing the stability of photonic crystal formation. The usefulness and limitations of the GO photonic crystals prepared in this study are discussed. (Graph Presented). © 2013 American Chemical Society.


Li P.,Texas A&M University | Yao H.,Texas A&M University | Wong M.,Texas A&M University | Sugiyama H.,Kaneka Corporation | And 2 more authors.
Journal of Materials Science | Year: 2014

Thermally stable and highly conductive films have been prepared based on thermally reduced graphene oxide and exfoliated α-zirconium phosphate nanoplatelet (ZrP) hybrids. Exfoliated ZrP and graphene oxide (GO) were first mixed in aqueous solution to form a stable dispersion and then cast into free-standing films through flow-directed assembly. Upon annealing at 750 °C in Argon atmosphere, significant amounts of oxidized species were removed from the GO and a noticeable recovery of sp2 structure of the reduced GO sheets was observed. With the incorporation of the inorganic nanoplatelets, the thermal stability and structural integrity of the hybrid films were greatly improved, while the good electrical conductivity of the reduced GO was maintained. Potential applications for graphene-based hybrid films based on the current approach are discussed. © 2013 Springer Science+Business Media New York.


Itoh H.,Kyoto Institute of Technology | Li Y.,Kyoto Institute of Technology | Chan K.H.K.,Kyoto Institute of Technology | Kotaki M.,Kaneka Americas Holding Inc. | Kotaki M.,Kyoto Institute of Technology
Polymer Bulletin | Year: 2016

Electrospinning has been recognized as a simple and straightforward technique for the production of nanometer and micron-scaled polymer fibers. The technique utilizes electrical forces to stretch and thin fine polymer solution jet drawn from the orifice of a nozzle. Due to the electrical nature of the spinning process, the electrical and ionic conductivity of the polymer solution was proposed to play an important influence on both the process and fiber morphology. This study aims to increase mechanical properties and control nanofiber morphology using a mass production electrospinning technique known as free surface electrospinning. It is found that development of ribbon-shaped fibers was due to thick polymer jets ejected from Taylor cones on the electrode of free surface electrospinning and fast solvent evaporation rate caused by high solution conductivity. Tensile testing of the nanofiber mats indicated higher tensile strength for nanofiber mat spun with solution of enhanced solvent conductivity. Correlating with internal structure characterized in terms of thermally properties and d-spacing, the increased mechanical properties of nanofibers from high conductivity solution were proposed to be attributed to the presence of ribbon-shaped fibers. © 2016 Springer-Verlag Berlin Heidelberg


Patent
Texas A&M University and Kaneka Americas Holding Inc. | Date: 2014-07-09

A method of manufacturing a nanocomposite having a continuous organic phase and oligomer-modified nanoplatelet that form mesomorphic structures, wherein the oligomer has a molecular weight of at least 100 g/mol.

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