Materials Literature
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Abstract Water crosslinking reactions of LDPE, PP, LLDPE, and the LDPE/PP and LDPE/LLDPE blends are investigated. Degrees of crosslinking of these samples are quantitatively compared and discussed in detail in terms of crosslinking ability, phase‐separation behavior, molecular weight (or viscosity), morphology of the…
Abstract We carried out tensile impact test and very low speed tensile test on ethylene‐based Ionomers (E/15wt %MAA) to clarify the relation between impact toughness and high‐ordered structure. We also studied the changes in high‐ordered structure under deformation by observing Differential Scanning Calorimetory (DSC)…
The first joint refinement of a local wave-function model from diffraction and Compton scattering data is reported. The proposed method suits particularly well the case of insulators. Crystalline magnesium oxide, for which both accurate directional Compton profiles and low-order structure factors are available, is cho…
The mechanism and strength of polymer bridging flocculation have been investigated by experiments on a four-component clay−polymer−salt−water system consisting of butylammonium vermiculite, poly(ethylene oxide) (PEO), butylammonium chloride, and water. The system was studied by neutron diffraction as functions of the…
The curing of polymer substrates with collimated beam of accelerated plasma is considered as a new method of LC alignment. As an aligning polymer we used polyninylcinnamate (PVCN), well known photoaligning material. Pretilt angle and anchoring energy of LC on PVCN substrates is investigated as a function of the incide…
Abstract Effects of silane grafting and water crosslinking reactions on crystallizations, melting behaviors, and dynamic mechanical properties of the LDPE/LLDPE blends are investigated using DSC and DMA. From DSC data, cocrystallization of LDPE and LLDPE does not occur, but cocrosslinking of these two polymers is evid…
Three types of experiments were used to study the surface chemistry of silicon in alkaline solution: minority carrier injection from a p−n junction electrode, in-situ photoluminescence, and electron transfer to a redox system in solution. The results lead to the conclusion that the surface chemistry and electrochemist…
New amphiphilic dendrimers derived from PAMAM and D-gluconolactone were found to induce chirality in the reduction of prochiral ketones by NaBH(4), in heterogeneous (THF) and homogeneous (water) conditions. The third generation of these amphiphilic dendrimers, G(3)G, was found to be a good chiral ligand for the reduct…
CS 2 -stabilized silver nanoparticles of ∼6 nm in diameter are prepared in aqueous solution via chemical reduction of Ag + ions by KBH 4 in the presence of CS 2 . The product is proven to be Ag by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electron diffraction (ED) patterns. In the UV−…
Abstract A simple kinetic model capable of describing the behaviors of solid‐state polymerization (SSP) of poly(ethylene terephthalate) (PET) has been developed. According to this model, there are two types of end groups, namely active end groups and inactive end groups, and the solid‐state polycondensation reaction i…
A pi-conjugated, but non-Kekulé- and nondisjoint-type poly(1,2-phenylenevinylene) network bearing 4-substituted di-tert-butylphenoxyls was synthesized through a one-pot polycondensation of the star-shaped subpart and the subsequent oxidation, which was persistent even at room temperature. The polyphenoxyl radical with…
We examine the various instabilities of quarter-filled strongly correlated electronic chains in the presence of a coupling to the underlying lattice. To mimic the physics of the tetramethyltetrathiafulvene $(\mathrm{TMTTF}{)}_{2}X$ Bechgaard-Fabre salts we also include electrostatic effects of intercalated anions. We…
A nanostructured, polymer-supported Sc(III) catalyst for heterogeneous Lewis acid catalysis in water was prepared by quantitative Sc(III) exchange of a cross-linked inverted hexagonal assembly containing sodium sulfonate groups. The material was found to catalyze Mukaiyama aldol and Mannich reactions with a syn/anti p…
The coarsening of droplets in an emulsion with a size distribution that initially is given by the Lifshitz−Slyozov−Wagner (LSW) distribution is studied by means of numerical calculations taking into account elastic interfacial behavior. Droplets smaller than the critical radius will shrink while droplets larger than t…
Abstract Silicone–acrylic resins were synthesized to prepare superweatherable paints for building materials. The raw materials used were n ‐butyl acrylate, methyl methacrylate, and n ‐butyl methacrylate as acrylic monomers and 3‐methacryloxypropyltrimethoxysilane (MPTS) as a silicone monomer reactive with the acrylic…
Layered nanocomposites with poly(ethylene oxide), PEO, and poly(vinylpyrrolidone), PVP, incorporated between H x Ti 2 - x /4 □ x /4 O 4 (□ = Ti vacancy) titanate layers, are synthesized from a colloidal titanate suspension obtained by exfoliation in aqueous tetrabutylammonium hydroxide and subsequent acidification. Pr…
The compound [Cu2(bpm)2(N3)4]n (bpm = bis(pyrazol-1−yl)methane) shows three unique coordination modes (μ1,1-, μ1,1,1-, μ1,1,3-N3) and ferromagnetic interaction between the copper(II) ions. The structure of the compound exhibits a one-dimensional railroad polymer made up of repeating defective dicubane-type units linke…
Abstract The morphology and properties of polypropylene (PP)/clay nanocomposites are described. The melt intercalation of organophilic clay was carried out with a single‐screw extruder. The effects of two kinds of treatments of clay are discussed. Maleic anhydride (MAH)‐grafted PP was used as a compatibilizer. The exp…
We have computed the local electric field in a body-centered tetragonal (BCT) lattice of point dipoles via the Ewald-Kornfeld formulation, in an attempt to examine the effects of a structure transformation on the local field strength. For the ground state of an electrorheological solid of hard spheres, we identified a…
Abstract Measurements of water vapor transmission rate ( WVTR ) are often based on the wet cup method described by ASTM E 96‐95. In attempting to compare the performance of thin polymer films with moderate to high water vapor permeability, it was observed experimentally that the ASTM method did not give reliable resul…