Materials Literature
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In this paper we report magnetic and specific heat results for the oxyborates ${\mathrm{Fe}}_{2}{\mathrm{OBO}}_{3}$ and ${\mathrm{Mn}}_{2}{\mathrm{OBO}}_{3}.$ The former presents L-type ferrimagnetism while the latter presents weak ferromagnetism in distinct ranges of temperature. The Curie constant for ${\mathrm{Mn}}…
A series of polyimide-based second-order nonlinear optical (NLO) materials were synthesized from poly(hydroxy−imide)s, followed by the Mitsunobu reaction with NLO chromophores. These chromophores, based on a nitro group connected with benzothiazole as the acceptor end of a donor−π-bridge−acceptor chromophore and a hyd…
Self-assembly of [5-(pyrazol-4-yl)-10,20-bis(p-tolyl)-15- (2-ethoxycarbonylphenyl)porphyrinato]-zinc(II) (1), designed to have both a coordination site and a hydrogen bonding site, leads to a stable cyclic trimer array where coordination of the pyrazole nitrogen to the zinc(II) ion as well as hydrogen bonding between…
This report describes the four-step synthesis of 6A,6D-diamino-6A,6D-dideoxy-2(A),2(B),2(C),2(D),2(E),2(F),3(A),3(B),3(C),3(D),3(E),3(F), 6(B),6(C),6(E),6(F)-hexadeca-O-methylcyclomaltohexaose (5), a methylated alpha-CD that bears two -CH(2)NH(2) ligands located on diametrically opposed glucopyranose rings. Reaction o…
Abstract Electron‐beam initiated crosslinking of poly(vinyl chloride)/epoxidized natural rubber blends, which contained trimethylolpropane triacrylate (TMPTA), was carried out over a range of irradiation doses (20–200 kGy) and concentrations of TMPTA (1–5 phr). The gel content increased with the irradiation dose and t…
Abstract Carboxymethyl starch (CMS) was prepared in a completely heterogeneous procedure in a methanol/water slurry activated with aqueous sodium hydroxide (45%, w/v) using monochloroacetic acid as the etherifying agent. The influence of the reaction conditions and the type of starting starch (amylose content and prea…
Abstract Electron‐beam initiated crosslinking of a poly(vinyl chloride)/epoxidized natural rubber blend (PVC/ENR), which contained trimethylolpropane triacrylate (TMPTA), was carried out over a range of irradiation doses (20–200 kGy) and concentrations of TMPTA (1–5 phr). The gelation dose was determined by a method p…
We report the results of a theoretical Study of the nitride trimers (i.e., M3N3 with M = Al, Ga, and In) focusing on their structure, stability, and vibrational properties. The calculated results reveal a distinct structural difference between the most stable isomers of Al and those of Ga and In, which can be explaine…
A resonant Raman study of the anti-Stokes and Stokes spectra for individual isolated single-wall carbon nanotubes is presented. The observed asymmetry between the anti-Stokes and Stokes spectra is analyzed within the framework of resonant Raman scattering theory, thereby providing a method for accurately determining t…
Abstract New formulations of plastisols based on low‐toxicity plasticizers were proposed and characterized. Traditional phthalate plasticizers were replaced in the plastisols studied in this research by polymeric plasticizers (i.e., saturated polyesters), produced by the reaction of a diol and a carboxylic acid. The m…
Abstract Films were prepared from a blend of low‐density polyethylene (LDPE) and ethylene‐vinyl acetate (EVA) containing 45% VA and ditrimethylol propane tetraacrylate (DTMPTA). Electron‐beam initiated crosslinking of these films was carried out over a range of radiation doses (20–500 kGy), concentrations of DTMPTA (1…
Abstract Chemically oxidative polymerization of aniline and o ‐toluidine (OT) with 6 molar ratios was performed using ammonium persulfate as an oxidant in a HCl medium at −18°C. It was observed that the copolymers were not regularly dependent on the monomer ratio for yield and intrinsic viscosity. The resulting copoly…
An overview of the basis, technology, and surface phenomena of protein-based surfactants natural raw materials and enzymatic modification of agricultural by-products for protein-based surfactants protein interaction at interfaces amino acid surfactants - chemistry, synthesis and properties enzyme-catalyzed synthesis o…
A structural analysis of the oriented γ form of isotactic polypropylene (iPP) is presented. The X-ray diffraction intensity distribution in the oriented γ form is quantitatively evaluated for the first time. The structural analysis is performed on a new, poorly stereoregular ([ mmmm ] = 35%) polypropylene material, pr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOxyindolophyrin: A Novel Fluoride Receptor Derived from N-Confused Corrole IsomerHiroyuki Furuta, Hiromitsu Maeda, and Atsuhiro OsukaView Author Information PRESTO, Japan Science and Technology Corporation Department of Chemistry Graduate School of Science Kyoto Univer…
Abstract Biodegradable polycaprolactone (PCL) was melt‐compounded in a Werner & Pfleiderer twin‐screw extruder (ZSK25) together with wood flour (WF) and lignin with maleic anhydride‐grafted polycaprolactone (PCL‐ g ‐MA) used as a compatibilizer. The grafting of maleic anhydride onto PCL was achieved with reactive…
Two types of three-arm or four-arm star-shaped hydroxy-terminated poly(ε-caprolactone) (PCL) were successfully synthesized via the ring-opening polymerization of ε-caprolactone (CL) with multifunctional initiator, such as trimethylolpropane (TMP) or pentaerythritol (PTOL), and stannous octoate (SnOct 2 ) catalyst in b…
Abstract The synthesis and properties of a class of soluble fluorine‐containing aromatic polyimides are described. Substituents of trifluoromethyl groups on the aromatic rings of paralinked aromatic ether diamine conferred the polymer prepared thereof with enhanced solubility, low‐moisture absorption, and low dielectr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSyntheses of Conjugated Polymers Derived from N-Alkyl-2,7-carbazolesJean-François Morin and Mario LeclercView Author Information Canada Research Chair in Polymer Chemistry, Department of Chemistry, Centre de Recherche en Sciences et…
The cubic complex Ginzburg-Landau equation is one of the most-studied nonlinear equations in the physics community. It describes a vast variety of phenomena from nonlinear waves to second-order phase transitions, from superconductivity, superfluidity and Bose-Einstein condensation to liquid crystals and strings in fie…