Materials Literature
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Abstract A new negative‐working and alkaline‐developable photosensitive polyimide precursor based on poly(amic acid) (PAA), 4,4′‐methylenebis[2,6‐bis(hydroxymethyl)]phenol (MBHP) as a crosslinker, and a photoacid generator (5‐propylsulfonyloxyimino‐5 H ‐thiophen‐2‐ylidene)‐2‐(methylphenyl)acetonitrile (PTMA) has been…
The hygroscopic properties of the borate crystals $\mathrm{Li}{\mathrm{B}}_{3}{\mathrm{O}}_{5}$, $\mathrm{Cs}{\mathrm{B}}_{3}{\mathrm{O}}_{5}$, and $\mathrm{Cs}\mathrm{Li}{\mathrm{B}}_{6}{\mathrm{O}}_{10}$ are studied by density-functional theory. It is found that the absorption energy and the diffusion mechanism of w…
Abstract In the presence of acrylic acid (AA) as a primary dopant, polyaniline (PANI) doped with poly(acrylic acid) was successfully synthesized by using ammonium persulfate (APS) as initiator and oxidizing agent. The effect of experimental conditions on the polymer yields was systematically studied. It was found that…
We have investigated plasma surface interactions of nanoporous silica (NPS) films with porosities up to 50%, and SiO2 with C4F8∕Ar discharges used for plasma etching. The pore size was about 2–3nm for all films. In highly polymerizing plasmas (e.g., pure C4F8 discharges), the porous structure of NPS material favors su…
To make an implantable bioartificial liver (IBL), a new biocompatible collagen/chitosan/heparin complex was prepared using a crosslinking agent. The X-ray photoelectron spectroscopy (XPS), mechanical strength and biocompatibility with whole blood and hepatocytes were measured. The collagen/chitosan/heparin complex res…
A biphenyl-pillared layered hybrid material having microporosity with a specific surface area of 616 m2 g−1 has been synthesized by the anisotropic condensation of 4,4′-bis(triethoxysilyl)biphenyl (BESB) into the layered silicic acid of ilerite.
Abstract Natural rubber/polystyrene (NR/PS) blend films with weight ratios of 70/30, 60/40, and 50/50 were prepared using polystyrene grafted natural rubber copolymers (NR‐ g ‐PS) as the compatibilizer. Copolymers with molar ratios of 90/10, 80/20, and 70/30 were synthesized via emulsion copolymerization using tert ‐b…
trans-Dihydroxo[5,10,15,20-tetrakis(n-pyridyl)porphyrinato]tin(IV) (n = 3 and 4) complexes have been synthesized and fully characterized. X-ray structural analysis of trans-dihydroxo[5,10,15,20-tetrakis(4-pyridyl)porphyrinato]tin(IV) reveals that the supramolecular hydrogen bondings between the hydroxotin(IV) porphyri…
Abstract To compare the properties of hyperbranched polymers with linear oligomers for preparing organic‐inorganic hybrids, hyperbranched aliphatic polyester (Boltorn TM H20) and linear polyester hexa‐acrylate (EB830) were selected as organic components for preparing UV‐curable transparent hybrid materials using 3‐(tr…
Abstract Novel phosphazene cyclomatrix network polymers were synthesized via nucleophilic displacement of activated nitro groups of tri(4‐nitrophenoxy)tri(phenoxy)cyclotriphosphazene and hexa( p ‐nitrophenoxy)cyclotriphosphazene with the hydroxyls of bisphenol A. Both the monomers and polymers were characterized by Fo…
Abstract Energy‐transfer processes in phenylene‐based materials are studied via two different approaches: i) the original Förster model, which relies on a simple point‐dipole approximation; and ii) an improved Förster model accounting for an atomistic description of the interacting chromophores. Here, to illustrate th…
Results of isothermal magnetization and magnetic relaxation measurements are presented probing the nature of the magnetic-field-induced magnetostructural transition in the intermetallic compound ${\mathrm{Gd}}_{5}{\mathrm{Ge}}_{4}$. This transition shows the characteristics of a disorder-influenced first order transit…
A general synthetic method for the preparation of nanostructured materials with large surface area was developed by using nanoparticle building blocks. The preparation route involves the self-assembly of functionalized nanoparticles in a liquid-crystal phase. These nanoparticles are functionalized by using difunctiona…
Abstract Complexation reactions of titanium tetraethoxide [Ti(OEt) 4 ] and titanium tetra‐ n ‐butoxide [Ti(OBu n ) 4 ] with 3‐pentenoic acid (PA) and allylacetoacetate (AAA), in a 1 : 1 M ratio, were studied in ethanol solution at room temperature. 13 C‐NMR and FTIR spectra showed that all PA and AAA completely reacte…
Abstract Polyaniline or polypyrrole composites with fir or oak wood have been prepared by in situ polymerization of the corresponding monomers in an aqueous suspension of wood sawdust. The percolation threshold of compressed coated particles is located below 5 wt % of the conducting component and, above this limit, th…
Colloidal aqueous suspensions of goethite lath-shaped nanorods form nematic and isotropic phases. We show that they also display a 2D rectangular (c2mm) columnar phase at volume fractions phi larger than 15%. Interestingly, the nematic-columnar first-order transition can also be triggered by applying to the nematic ph…
Three methods were investigated for their suitability for the activation of poly(ethylene glycol) 2000 mono-methyl ether en route to conjugation with dendrimers, using 4-nitrophenylchloroformate as the activator. The use of acetonitrile as a solvent gave the best results. Poly(ethylene glycol) (PEG) grafted polyamidoa…
Abstract Bis(3‐thienyl)perfluorocyclopentenes containing partially fluorinated thiophene rings were synthesized and their behaviors examined. Dithienylethenes containing chlorinated thiophene rings were also prepared as reference compounds. The absorption maxima of the closed‐ring isomers, their thermal stabilities, a…
The influence of $A$ site disorder on the magnetic and transport properties of ${\mathrm{Pr}}_{0.6}{R}_{0.1}{\mathrm{Sr}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ ($R=\mathrm{Tb}$, Y, Ho, and Er) polycrystalline samples is analyzed within the context of percolative transport and the existence of the Griffiths phase. The temp…
Here we report the synthesis and characterization of a new class of nanocomposite by direct in situ oxidative polymerization of 3,4-ethylenedioxythiophene (EDOT) with VS2 as a host material in the presence of an external oxidizing agent. Upon intercalation, the interlayer spacing of VS2 expands from 5.71 Å to 14.01 Å,…