Materials Literature
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Abstract The isothermal crystallization kinetics of polypropylene/montmorillonite (PP/MMT) nanocomposites synthesized via intercalation polymerization were investigated by using differential scanning calorimeter and polarizing optical microscope (POM). The crystallinity of the nanocomposites decreased with the increas…
Temperature programmed desorption, high-resolution electron energy loss spectroscopy (HREELS), and density functional theory (DFT) were used to investigate the adsorption and reaction of ethylene oxide (EO) on the Ag(111) surface. When EO is dosed onto Ag(111) at 140 K it adsorbs molecularly, desorbing without reactio…
A ground-state dimer (denoted D(I)) exhibiting a strong absorption maximum at 477 nm (epsilon = 97 000 M(-1)cm(-1)) can form between adjacent BODIPY groups attached to mutant forms of the protein, plasminogen activator inhibitor type 1 (PAI-1). No fluorescence from excited D(I) was detected. A locally high concentrati…
As a result of important advances over the last decade, block copolymer melts have become an excellent model system for studying fundamental phenomena associated with molecular self-assembly. During this time, good quantitative agreement has been achieved between theory and experiment in regards to equilibrium phase b…
We conduct molecular-dynamics computer simulations of a system of Lennard-Jones particles, polydisperse in both size and mass, at a fixed density and temperature. We test for and quantify systematic changes in dynamical properties that result from polydispersity, by measuring the pair-distribution function, diffusion…
Abstract Polyamide and polypropylene (PP) are two important classes of commercial polymers; however, their direct mixing leads to incompatible blends with poor properties. Polypropylene functionalized with glycidyl methacrylate (PP‐GMA) was used as a compatibilizer in blends of PP and nylon 6, because of the possible…
Two copolymers, poly{4‘-[[[2-(methacryloyloxy)ethyl]ethyl]amino]-4-nitroazobenzene}- co -[(methacryloyloxy)-4-nitrophenyl-( S )-prolinol] (poly(DR1M- co -( S )-NPPMMA)) and poly{4-[2-methacryloyloxy)ethyl]azobenzene- co -[(methacryloyloxy)-4-nitrophenyl-( S )-prolinol] (poly(MEA- co -( S )-NPPMMA)), were synthesized a…
Abstract An attempt was made to study the structural, electrical, and optical properties of plasma‐polymerized pyrrole and iodine‐doped pyrrole. A comparative study of the IR spectra of the monomer and polymer pyrrole gives information that the ring structure is retained during plasma polymerization. Iodine doping con…
The final structure of a colloidal system is greatly influenced by the mechanisms by which phase separation and aggregation occur. The drive to phase separate can be altered in colloid-polymer mixtures (which phase separate due to the depletion interaction) by varying the polymer concentration. Here, we use small angl…
Abstract Two types of three‐arm and four‐arm, star‐shaped poly( D,L ‐lactic acid‐ alt ‐glycolic acid)‐ b ‐poly( L ‐lactic acid) ( D,L ‐PLGA50‐ b ‐PLLA) were successfully synthesized via the sequential ring‐opening polymerization of D,L ‐3‐methylglycolide (MG) and L ‐lactide ( L ‐LA) with a multifunctional initiator, s…
Abstract The process of low‐melting point (LMP) α‐phase formation in a quenched and annealed isotactic polypropylene (iPP) was studied by means of differential scanning calorimetry. The influence of preparation conditions (quenching and annealing temperatures, annealing times and sample thickness), together with the m…
We present lattice-gas modeling of the steady-state behavior in CO oxidation on the facets of nanoscale metal clusters, with coupling via interfacet CO diffusion. The model incorporates the key aspects of the reaction process, such as rapid CO mobility within each facet and strong nearest-neighbor repulsion between ad…
Abstract Biodegradable poly(ester amide)s that contained phenylalanine residues in the main chains were synthesized by the polycondensation of di‐ p ‐nitrophenyl sebacate and phenylalanine 2‐aminoethyl ester. The stereoisomeric composition ( L / D ratio) of the phenylalanine residue in the monomer did not affect the y…
A series of dimethylsiloxane linked cyanate ester monomers (NCOC 6 H 4 (CH 2 ) 3 (Si(CH 3 ) 2 O) n Si(CH 2 ) 3 C 6 H 4 OCN, n = 1, 2, 3) have been synthesized and characterized. Monomer melting points range from 5 to −12 °C, and characterization includes 1 H, 13 C NMR, and IR spectroscopies and DSC. Thermoset formatio…
The mesomorphic behavior of several new end-functionalized liquid-crystal-containing dendrimers is reported. These liquid-crystalline dendrimers are obtained by attaching promesogenic units to the termini of the preexisting first five generations of poly(amidoamine) (PAMAM) and poly(propyleneimine) (DAB) polymers by a…
We report on the design and synthesis of a new disclike mesogen based on a 3,5-dicyano-2,4,6-tristyrylpyridine core. This compound was characterized by spectroscopic methods (NMR, UV−vis, and photoluminescence) and cyclic voltammetry. The mesogenic behavior was investigated by differential scanning calorimetry, polari…
The first step in the biosynthetic pathway of vitamin C in plants is the formation, at the level of sugar nucleotide, of l-galactosyl residues, catalyzed by a largely unknown GDP-d-mannose 3",5"-epimerase. By using combined conventional biochemical and mass spectrometry methods, we obtained a highly purified preparati…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFrom Membranes to Melts, Rouse to Reptation: Diffusion in Polymersome versus Lipid BilayersJames C.-M. Lee, Maria Santore, Frank S. Bates, and Dennis E. DischerView Author Information School of Engineering and Applied Science, Unive…
Equilibrium adsorption isotherms for methane, ethane, ethylene, acetylene, propane, and propylene have been measured for the first time on mesoporous silica, SBA-15, and the data are analyzed by using the Langmuir−Freundlich adsorption isotherm model. The adsorption capacities for ethylene and propylene are found to b…
We consider a mean field model describing the free cooling process of a two component granular mixture, a generalization of so called Maxwell model. The cooling is viewed as an ordering process and the scaling behavior is attributed to the presence of an attractive fixed point at $v=0$ for the dynamics. By means of as…