Materials Literature
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Abstract Deproteinized natural rubber (DPNR) latex, prepared by digesting the protein within low‐ammonia preserved concentrated (NR‐LA) latex with alcalase enzyme at 40°C for 24 h, has the nitrogen content of 0.039 wt %. Poly(methyl methacrylate) (PMMA) and graft copolymers (DPNR‐ g ‐PMMA) latices were synthesized by…
Abstract Tensile tests on high‐impact polystyrene (HIPS) show that a 60 Mrad dose of γ‐radiation raises the yield stress from 11.5 to 19.8 MPa, and the flow stress from 10.0 to 19.6 MPa, while reducing the elongation at break from 50 to 4%. Similar reductions in fracture resistance are observed in irradiated Charpy im…
Thermal interface materials (TIMs) play a key role in the thermal management of microelectronic devices by providing a path of low thermal impedance between heat generating devices and heat dissipating components (heat spreader/sink). In addition, TIMs often provide mechanical coupling between the silicon device and t…
Abstract The isothermal crystallization behavior of polypropylene (PP) catalloys and neat PP were studied with differential scanning calorimetry and polarized optical microscopy (POM). The crystallization kinetics of the samples were described with the well‐known Avrami equation. The crystallization rate depended rema…
A method of determining the polar anchoring strength W d of a vertical alignment nematic liquid crystal-wall interface is proposed. W d is evaluated from the measurements of the optical retardation of a thin hybrid alignment nematic cell as a function of the wavelength of the incident light and cell rotating angles. A…
Abstract A conductive poly(aniline codoped with dodecyl benzene sulfonic acid and hydrochloric acid) [PANI‐D/H, yield: 32.2%, intrinsic viscosity ([η]): 1.39 dL/g, electrical conductivity: 7.3 S/cm] was synthesized by chemical oxidative polymerization from aniline‐dodecylbenzene sulfonic acid salt (A‐DS)/aniline‐hydro…
Cyclopentadienylmanganese complexes of the general formula (η 5 -C 5 H 4 CH 3 )Mn(CO) 2 L, where L is a nonchelatable, bifunctional ligand, were found to be photochromic. Irradiation of (η 5 -C 5 H 4 CH 3 )Mn(CO) 2 L(3-cyanomethylpyridine) with alternating visible and UV light produced alternating yellow and red solut…
A single-step approach for the synthesis of polyphosphazenes containing sulfonic acid functionalities is developed. Polyphosphazene “sulfonation” is conducted via the direct replacement of chlorine atoms of the macromolecular precursor, poly(dichlorophosphazene), PDCP with a sulfonic acid containing nucleophile hydrox…
Porous alumina films with controllable pore sizes and having submicrometer film thicknesses were fabricated by the anodization of Al overlayers. The Al was deposited by sputtering onto either glass or onto silicon that had been coated with a layer of silicon nitride. Alumina membranes having thicknesses between 300 an…
Abstract The kinetics of the hydroformylation of high‐molecular‐weight cis ‐1,4‐polybutadiene in the presence of HRh(CO)(PPh 3 ) 3 and monochlorobenzene as a solvent were studied. The degree of conversion was examined by spectroscopic characterization with Fourier transform infrared and 1 H‐NMR analysis. According to…
Abstract Conductive and flexible polydimethylsiloxane (PDMS)/polypyrrole (PPy) composites were synthesized electrochemically. Electrochemical syntheses were performed at +1.10 V by using p ‐toluene sulfonic acid (PTSA) as supporting electrolyte and water as solvent. Composites were characterized by cyclic voltammetry,…
Recombinant Escherichia coli harboring the medium-chain-length (MCL) polyhydroxyalkanoate (PHA) synthase gene has been shown to accumulate MCL-PHAs from fatty acids when FadB is inactive. However, the enzymes in fadB mutant E. coli responsible for channeling the beta-oxidation intermediates to PHA biosynthesis have no…
Widely well-aligned two-dimensional ZnO nanodot arrays ( e.g. , 40,000 nanodots of 130 nm diameter and 9 nm height over 150 ×150 µm 2 with a period of 750 nm) have been fabricated by metalorganic chemical vapor deposition on SiO 2 /Si substrates patterned by focused ion beam (FIB). A low-magnification FIB patterning m…
Magnetic and structural properties of CrAs epilayers grown on GaAs(001) by molecular beam epitaxy have been studied. CrAs epilayers are orthorhombic for all thicknesses investigated but show a structural transition from a metastable phase for very thin films, to the usual bulk MnP-type orthorhombic phase at higher thi…
Abstract In this study, expanded starch/poly(vinyl alcohol) (PVA) blends for packing material were prepared by using calcium carbonate as the expansion inhibitor to investigate the degradability and the structural and mechanical properties of expanded starch/PVA/calcium carbonate blends (ESPCs). The structure of ESPCs…
Abstract The recombination of polycarbonate (PC) chains has been researched as one of the studies on self‐repairing materials. The specimens, which included sodium carbonate and Tri(2,4‐di‐t‐buthylphenyl)phosphate, were treated at 120°C in a steam chamber and subsequently at 130°C under nitrogen atmosphere. The molecu…
The immiscibility between rhombohedral ${\mathrm{La}}_{5/8}{\mathrm{Sr}}_{3/8}{\mathrm{MnO}}_{3}$ and hexagonal ${\mathrm{LuMnO}}_{3}$ leads to a $\ensuremath{\mu}\mathrm{m}$-scale heterogeneous mixture of half-metallic-ferromagnetic and insulating-ferroelectric phases. Electronic conduction of the mixture exhibits ne…
The dynamics of sorbitol/glycerol mixtures across the entire composition range has been characterized by dielectric relaxation measurements for frequencies between 10 mHz and 10 MHz. We explore the gradual change in the glass transition temperature ( T g ), fragility ( m ), nonexponentiality ( β KWW ), and occurrence…
Abstract Ethylene propylene rubber–clay nanocomposites (EPR–CNs) were prepared by melt‐compounding maleic anhydride modified EPR (EPR‐MA) with organophilic clay, and their properties were examined. Silicate layers of organophilic clay were found to exfoliate and homogeneously disperse into the nanometer level in the n…
Abstract Five new poly(ether imides) have been prepared on reaction with oxydiphthalic anhydride (ODA) with five different diamines: 1,4‐bis( p ‐aminophenoxy‐2′‐trifluoromethyl benzyl) benzene, 4,4′‐bis( p ‐aminophenoxy‐2′‐trifluoromethyl benzyl) benzene, 1,3‐bis( p ‐aminophenoxy‐2′‐trifluoromethyl benzyl) benzene, 2,…