Materials Literature
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Muons as a probe of magnetism in molecule-based low dimensional magnets, Tom Lancaster, Stephen J Blundell, Francis L Pratt, Michael L Brooks, Jamie L Manson, Euan K Brechin, Cyril Cadiou, David Low, Eric J L McInnes, Richard E P Winpenny
Previously it was shown by experiments that nanophase separation of incompatible main- and side-chain parts occurs in higher poly( n -alkyl acrylates) (P n AA) and poly( n -alkyl methacrylates) (P n AMA). Alkyl groups of different monomeric units of the polymer aggregate in the melt and form self-assembled alkyl nanod…
The syntheses and metal-responsive properties of poly(p-phenyleenethynylene)s with grafted new pseudo-crown-ether groups are reported. These polymers exhibit high sensitivities to alkali ions because of their collective optical properties, which are very sensitive to ion-induced conformational changes. The quenching o…
A molecular dyad has been synthesized in which free-base porphyrin and ruthenium(II) bis(2,2‘:6‘,2‘ ‘-terpyridine) subunits are linked via a meso -phenylene group. The distal terpyridine ligand bears a single phenylethynylene group. Selective illumination into the metal complex is followed by rapid intramolecular trip…
The structure of metal nanoparticles templated by amphiphilic hyperbranched polyethylenimine-amides in apolar organic solution was studied by means of small-angle neutron scattering (SANS). SANS measurements at different concentrations revealed that the neat polymer is present as nonaggregated unimolecular micelles fo…
Abstract Diarylmaleimide derivatives having methoxy, phenyl, or cyano group as a nitrogen substituent were synthesized in an attempt to prepare photochromic compounds which exhibit photochromic reactivity even in polar solvents. Although the derivatives having methoxy or phenyl group did not undergo photochromism in p…
Modified polyguanidines were prepared, and their liquid crystalline properties were studied using optical polarizing microscopy and X-ray diffraction. Parameters examined include chirality, the uniformity of the lengths of side chains, and attached side-chain mesogens. If the side chains on the repeat units are identi…
In this paper, we study three symmetrical D-pi-D chromophores containing dithieno[3,2-b:2',3'-d]thiophene (DTT) as the pi-center and various donor end moieties, by means of UV-vis-NIR and FT-Raman spectroscopy and in situ spectroelectrochemistry. The compounds display dual redox properties: all exhibited two oxidation…
Scanning tunneling microscopy (STM), in conjunction with the nucleation and growth of Au clusters, has been used to identify and quantify various types of defects on ordered, SiO 2 thin films grown on Mo(112). On a low-defect surface, Au clusters nucleate and grow at line defects with metal deposition at room temperat…
Arrayed, needlelike nanostructures of rutile phase crystal TiO 2 were grown on a Si substrate containing TiO 2 seeds prepared through a thin polystyrene- b -poly(4-vinylpyridine) (PS- b -P4VP) diblock copolymer template. The morphology of the deposited TiO 2 nanostructures was characterized by field-emission scanning…
Linear flexible polymers of N g monomers, end-grafted at the density σ onto a spherical surface of radius R (“hairy sphere”), including the case of a flat impenetrable wall ( R → ∞), are simulated using the cooperative motion algorithm. The simulations have been carried out for a wide range of parameters characterizin…
The structure and dynamics of surfactant and polymer chains in intercalated poly(epsilon-caprolactone)/clay nanocomposites are characterized by (31)P magic-angle spinning (MAS) and (13)C cross-polarization MAS NMR techniques. To obtain hybrid materials with the low polymer content required for this study, in situ inte…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTReversible and Efficient Proton Dissociation of Spirobenzopyran-Functionalized Poly(N-isopropylacrylamide) in Aqueous Solution Triggered by Light Irradiation and Temporary Temperature RiseKimio Sumaru, Mitsuyoshi Kameda, Toshiyuki K…
The segmental and local dynamics of amorphous blends of poly(methyl methacrylate) and poly(ethylene oxide) (PMMA/PEO) were investigated using dielectric relaxation spectroscopy. The derivative of the dielectric permittivity facilitates the observation of the cooperative segmental relaxation (α b ) in blends with low P…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDendritic Macrophotoinitiator Containing Thioxanthone and Coinitiator AmineXuesong Jiang and Jie YinView Author Information Research Institute of Polymer Materials, School of Chemistry & Chemical Technology, State Key Laboratory for…
Recently synthesized porphyrin−fullerene dyads with two separate linkers form a nearly symmetric complex with π-stack sandwich-like structure. The interchromophore interactions of such complexes can be fine-tuned by varying the linker lengths, which opens an opportunity to control physical and chemical properties of t…
This study investigates the effect of different types of surfactant (glycerol monostearate, Tween 60, and Tween 80) on water vapor permeability (WVP), tensile strength (TS), percentage elongation at breaking (E), and structure of an emulsified edible film composed of cornstarch, methylcellulose, and cocoa butter or so…
The synthesis and characterization of a photocurable biodegradable elastomer as a potential biomaterial for the delivery of thermosensitive drugs are described. The elastomer was prepared from UV initiated cross-linking of an acrylated star-poly(epsilon-caprolactone-co-D,L-lactide) prepolymer. The influence of the mol…
Pyrene-containing polymers have been prepared for noncovalent sidewall functionalization of multiwalled carbon nanotubes (MWNTs). (1-Pyrene)methyl 2-methyl-2-propenoate (PyMMP) has been synthesized and copolymerized with methyl methacrylate (MMA). Poly(ethylene- co -butylene)- b -poly(MMA- co -PyMMP) diblocks have als…
Glassy pharmaceuticals, characterized by excess thermodynamic properties, are theoretically more soluble than their crystalline counterparts. The practical solubility advantage of the amorphous form of celecoxib (CEL) is lost due to its proclivity to lose energy and undergo solvent-mediated devitrification. Theoretica…