Materials Literature
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A series of novel AB3-type monomers were prepared from nontoxic natural gallic acid and amino acids. These monomers were then melt-polycondensed in the presence of MgO as a catalyst via a transesterification process at 170-190 degrees C to yield the hyperbranched poly(ester-amide)s bearing terminal acetyl groups. FTIR…
Abstract New poly(imide–benzoxazole) copolymers were prepared directly from a dianhydride, a diacid chloride, and a bis( o ‐diaminophenol) monomer in a two‐step method. In the first step, poly(amic acid–hydroxyamide) precursors were synthesized by low‐temperature solution polymerization in an organic solvent. Subseque…
A refined hydrochemical model for single-bubble sonoluminescence (SBSL) is presented. The processes of water vapor evaporation and condensation, mass diffusion, and chemical reactions are taken into account. Numerical simulations of Xe-, Ar- and He-filled bubbles are carried out. The results show that the trapped wate…
TEM images and measurements of SERRS (surface-enhanced resonance Raman scattering) spectra as a function of the porphyrin concentrations in systems with unmodified and chloride-modified Ag nanoparticles and protoporphyrin IX (PPIX) are reported. TEM images have shown formation of compact aggregates in systems with chl…
Amphiboles have been synthesized by hydrothermal techniques at 500–600 °C, 1 Kbar P(H2O) and low oxygen fugacity (close to NNO) at nominal compositions along the join ferri-clinoholmquistite [squareLi2Mg3Fe3+2Si8O22(OH)2] – ferri-clino-ferroholmquistite [squareLi2Fe2+3Fe3+2Si8O22(OH)2]. SEM-EDS and X-ray powder diffra…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTNew Facile Approach to Novel Water-Soluble Aliphatic Poly(butylene tartarate)s Bearing Reactive Hydroxyl Pendant GroupsQinghui Hao, Jing Yang, Qiaobo Li, Yang Li, Lin Jia, Qiang Fang, and Amin CaoView Author Information Laboratory for Polymer Materials, Shanghai Institute of Or…
Abstract Compatibilized blends of poly(ethylene terephthalate (PET) with an aromatic polyamide such as poly( m ‐xylylene adipamide) (MXD6) have good transparency ( T ) because the constituent refractive indices (RIs) match closely. However, haziness is observed when the blends are stretched. This study demonstrated th…
We develop a shell model (SM) for magnesium hydride with interatomic potentials and anisotropic core–shell interactions. The model is fitted to measured Raman modes and ab initio results that we obtain for the phonons at the Γ point. We achieve a very good agreement for the Raman and silent phonons, while the infrared…
Microbeam grazing-incidence small-angle X-ray scattering (microGISAXS) has been used and the technique has been improved in order to investigate protein nucleation and crystal growth, assisted by a protein nanotemplate. The aim is to understand the protein nanotemplate method in detail, as this method has been proved…
The reduction of Cu(II) oxide species in siliceous matrixes of different porosity (MFI, FAU, MCM-48) and in alumosilicate MFI was studied by temperature-programmed reduction in hydrogen (TPR), by X-ray absorption fine structure (after stationary hydrogen treatments), and by transmission electron microscopy. It was fou…
Capillary-channeled polymer (C-CP) fibers are demonstrated as a potential stationary phase for liquid chromatography separation of protein mixtures. Separation of a synthetic mixture of four proteins is accomplished within a 45-second window using a conventional revered-phase (RP) gradient, at a mobile phase flow rate…
A series of tetragonally distorted square pyramids of formula N2S2M(NO) (M = Fe, Co) is prepared and characterized by nu(NO) IR and EPR spectroscopies, magnetism and electrochemical properties, as well as solid-state crystal structure determinations. While the nu(NO) IR frequencies and the angleM-N-O angles indicate d…
Reciprocal space mapping using a linear gas detector in combination with a matching Soller collimator has been applied to map scattering rods of well oriented organic microcrystals grown on a solid surface. Formulae are provided to correct image distortions in angular space and to determine the required oscillation ra…
We make systematic measurements of the anti-Stokes/Stokes (aS/S) ratios using low power lasers (0.5 mW at 514 and 633 nm) of rhodamine 6G (RH6G) on dried silver colloids over a wide range of temperatures from 140 to 350 K. We show that a scan in temperature allows the extraction of the contributions to the anti-Stokes…
We study structural phase transition of polymer-grafted colloidal particles by Monte Carlo simulations on hard spherical particles. The interaction potential, which has a weak repulsive step outside the hard core, was validated with use of the self-consistent field calculations. With this potential, canonical Monte Ca…
Abstract The water bamboo husk is one of major agricultural wastes in Taiwan. In this study, the fiber and powder obtained from the water bamboo husk were chemically modified by coupling agents. Furthermore, the modified fiber and powder were added to the biodegradable polymer poly(butylene succinate) (PBS) separately…
Abstract Stringent environmental regulation has endowed dispersible coatings with excellent property profiles in industrial applications. In this aspect, aqueous polyurethane dispersions (PUDs) are of special interest. The present study reports on the synthesis of hydroxylated polyester (HP) based polyurethane polyols…
Stable and semiconducting: Polyanionic hydrides represent a new class of main-group-metal hydrides with unforeseen hydrogen-coordination environments. The hydrogen atom in SrAlSiH is attached exclusively to Al and forms part of a layered [AlHSi]2− polyanion (see figure). This material is the first narrow bandgap semic…
Abstract Fillers are used along with various commodity as well as engineering polymers to improve the properties of polymers. The performance of filled polymers is generally decided on the basis of the interface attraction of filler and polymers. Fillers of widely varying particle size and surface characteristics are…
Abstract The electron‐beam irradiation of polymers generates modification effects in the macromolecular structure and material properties. Therefore, irradiation processing is mostly realized in the polymer solid state. In this way, the modification of linear polypropylene may result in long‐chain branching of polypro…