Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract Master plots were used to corroborate R n ‐type mechanisms calculated in a previous study, using the method proposed by Criado et al. (Thermochim Acta 1989, 147, 377). Analysis of experimental data seems to belong to the family of decelerated curves ( R n ) in the range of conversion studied. The lifetime of…
Poly(urethane-imide)s were prepared using a series of N-methylaniline-blocked polyurethane (PU) prepolymers. The PU prepolymer was prepared using polypropylene glycol of molecular weight 2000 and tolylenediisocyanate, and masked with N-methyl aniline, N-methyl-p-anisidine and N-methyl-p-nitroaniline. The blocked PU pr…
The processes of adsorption of two neutral polymers (poly(vinyl pyrrolidone), PVP and poly(vinyl alcohol), PVA) were investigated on liposomes composed of soy lecithin/dicetyl phosphate/cholesterol = 25:2:3 (molar ratio). The liposomes were prepared in buffered solution at pH = 7.4 and mixed with the solution of the m…
In this article, blend films were prepared by blending 2 wt% chitosan acetate solution with 2 wt% polyacrylamide (PAAm) aqueous solution. The structure and physical properties of the resulting blend films were analysized by FT-infrared spectra (FT-IR), wide angle X-ray diffraction (WAXD), thermo-gravimetric analysis (…
Gold nanoparticles up to 70 nm in diameter could be extracted from aqueous solutions into nonpolar organic solvents by tetrathiolated resorcinarenes 1 and 2. The resorcinarene-coated nanoparticles formed stable dispersions in toluene and chloroform and could be passed through a crosslinked polystyrene column without s…
Abstract The blends of Polypropylene (PP), that is a semicrystalline and nonpolar thermoplastic polymer with a polar and amorphous polymer such as Polystyrene (PS), are known to be immiscible. This article investigates the use of an aromatic vinyl monomer (AVM)‐grafted PP (PPA) as a potential compatibilizer for such a…
The molecular twist of diaminodicyanoquinodimethanes in the crystalline state is conveniently modeled using solvation-included semiempirical computations employing an adjustable dielectric constant to mimic the molecular environment. The dielectric constants used can be qualitatively correlated to the nature of interm…
The complexing properties of two lower rim calix(4)arene derivatives, namely, 5,11,17,23-tetrakis(1,1-dimethylethyl)-25,27-bis[2-(methylthio)ethoxy]-26,28-bis[2-(diethylamine)ethoxy]calix(4)arene ( 1a ) and p - tert -butylcalix(4)arene tetradiisopropylethanoamide ( 1b ) toward lanthanide(III), scandium, and yttrium ca…
The interplane optical spectrum of the organic superconductor $\ensuremath{\kappa}\ensuremath{-}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}\mathrm{Cu}[\mathrm{N}(\mathrm{CN}{)}_{2}]\mathrm{Br}$ was investigated in the frequency range from 40 to $40000 {\mathrm{cm}}^{\en…
Two novel series of poly(arylidene-ether)s and copoly(arylidene-ether)s were synthesized from N-methylpiperidone and/or cyclohexanone respectively. The first series (homopolymers) was derived from 4,4′-diformyl-α,ω-diphenoxyalkane or 4,4′-diformyl-2,2′ dimethoxy-α,ω-diphenoxyalkane with N-methylpiperidone. The second…
Abstract Carbon black/natural rubber latex masterbatch in the form of spherical beads was prepared according to the acid‐precipitation method. High‐loading carbon black (40 phr) was incorporated in natural rubber with the aid of a nonionic surfactant (Nonidet P40). Shearing the beads in an internal mixer provided good…
Drying behavior of acetate filament in dry spinning is investigated, including the elongational deformation of polymer solution thread in the early stage of drying. Variations of diameter, velocity, temperature, solvent concentration profile in the thread and tension distribution along the threadline in the spinning c…
Abstract A series of copolymers were prepared by chemically oxidative polymerization of pyrrole (PY) and ortho ‐toluidine (OT) in HCl aqueous medium. The yield, intrinsic viscosity, and solubility of the copolymers were studied by changing the monomer molar ratio. The resulting PY/OT copolymers were identified by FTIR…
Some aspects of local order in the amorphous state of a glassy polymer are discussed. The physical principles behind a cluster model involving the new concept of a structural defect are presented. A comparative analysis of three major approaches to describing the amorphous state of a polymer is given. It is shown that…
When body-centered-cubic crystals undergo plastic deformation, the slip planes are often noncrystallographic. By performing atomistic simulation on the activation pathway of dislocation jumps in bcc iron, we show that the main reason for bcc crystals to exhibit this phenomenon is that one type of kink pair has signifi…
The data of IR, 1H NMR and electronic absorption spectroscopy of porphyrins and their precursors and derivatives are analysed, systematised and generalised. The bibliography includes 105 references.
Poly(ethylene glycol) (PEG) ( M w = 6k, 10k, and 20k g/mol) terminated at both ends by hydrophobic fluoroalkyl segments (−(CH 2 ) 2 C n F 2 n +1, n = 6, 8, or 10) was synthesized and demonstrated to self-assemble into hydrogels with phase behavior and mechanical and erosion properties that can be systematically varied…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSurface Mobile Layer of Polystyrene Film below Bulk Glass Transition TemperatureDaisuke Kawaguchi, Keiji Tanaka, Atsushi Takahara, and Tisato KajiyamaView Author Information Department of Applied Chemistry, Faculty of Engineering, K…
Electroactive and blue light-emitting poly(vinyl diphenylquinoline) (PVQ) was synthesized in nearly quantitative yield by a simple modification of polystyrene. The new polymer and its model compound 2,4-diphenylquinoline were characterized by 1 H NMR, FT-IR, photoluminescence spectroscopies, and thermal analysis. PVQ…
Abstract The state of sorbed water and the sorbing processes of water to various polymer thin films were studied with Fourier transform infrared (FTIR) spectroscopy. To prepare the polymer films, we used poly(ethylene glycol)s of different molecular weights and various kinds of vinyl polymers, such as poly(2‐methoxyet…