Materials Literature
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Molecular dynamics (MD) simulations of Thermus thermophilus chorismate mutase substrate complex (TtCM x S) have been carried out at 298 K, 333 K, and the temperature of optimum activity: 343 K. The enzyme exists as trimeric subunits with active sites shared between two neighboring subunits. Two features distinguish in…
Abstract Graft copolymerization of several vinyl monomers onto polyisoprene was carried out to explore the possibility to recycle waste rubber to useful functional materials. Synthetic polyisoprene, vulcanized natural rubber, and vulcanized natural rubber with carbon black were converted to lower molecular weight poly…
Abstract The influences of the treatments with various polymers on fibrillation and abrasion resistances of lyocell materials were investigated with respect to the type of polymer, the polymer concentration, and the drying temperature. Fibril number, generated with agitation using ball‐bearings (FN ball ), was decreas…
Abstract Trimethylolpropane (TMP) is frequently used as a trifunctional branching and chain‐extending agent in polyurethane production. This article deals with the analysis of the reactivities of the three primary hydroxyl groups of TMP during reactions with two exemplary diisocyanates: aromatic diphenylmethane‐4,4′‐d…
Abstract Dichlorocarbene modification of natural rubber (NR) carried out by alkaline hydrolysis of chloroform in presence of cetyl trimethyl ammonium bromide as phase‐transfer catalyst was investigated. Extent of chemical reaction was characterized by estimation of chlorine content and FTIR studies. Rate of dichloroca…
New types of biodegradable and pH sensitive polyurethanes containing azo derivatives of 5-aminosalicylic acid (5-ASA) were synthesized by condensation of hexamethylene diisocyanate (HDI) with 4, 4-dihydroxy azobenzene-3, 3-dicarboxylic acid (AZO I) or 4, 4-dihydroxy 3-formyl azobenzene-3-carboxylic acid (AZO II). They…
Microencapsulation of theophylline in polyurethane was developed with 4, 4'-methylenediphenyl isocyanate (MDI), castor oil (CO) and ethylene diamine as a chain extender. Polyurethane microspheres were prepared in two steps pre-polymer preparation and microspheres formation. CO, MDI and theophylline were mixed first be…
Zinc salts of ethyl, isopropyl, and butyl xanthates are prepared in the laboratory, and the effect of these xanthates with zinc diethyl dithiocarbamate (ZDC) on the vulcanization of HAF-filled nitrile butadiene rubber (NBR) compounds has been studied at different temperatures. The cure times of these compounds have be…
Abstract Bis‐[3‐(vinyloxyethoxy)‐2‐hydroxypropyl‐]polysulfides (BVPS) have been prepared by reacting ethylene glycol vinyl glycidyl ether (EGVGE) with Na 2 S 4 in the presence of NaHCO 3 and a phase transfer catalyst, triethylbenzylammonium chloride. The polysulfides obtained are inactive in radical polymerization but…
Abstract The Starch–Casein‐based edible films containing with or without neem ( Melia azadirachta ) extract was prepared. The neem based free films were also heat pressed and all of them were assessed for inhibition of pathogenic organisms namely E. coli, Staphylococcus aureus, Bacillus cereus, Listeria monocytogenes,…
Abstract Chitosan (Ch) and N ‐carboxymethylchitosan ( N ‐CMCh) films were prepared by the casting method at concentrations of 1% and 2% of polymer, with or without plasticizer: polyethylene glycol (PEG‐400) and glycerol (G), at 15% (w/w). The influence of composition on mechanical properties, water vapour transmission…
Dipole moments μ, static averaged polarizabilities ⟨αrang;, and hyperpolarizabilities βvec of thiazole, benzothiazole, and their dipolar substituted derivatives have been computed by means of B3LYP and MP2 theories with the Pol basis set. Basis set effects have been considered for thiazole, benzothiazole, and doubly s…
We describe a novel colour-tunable light-emitting diode whose operation is based on direct band-gap emission from coupled configurations of InP quantum dots and quantum wells embedded in GaP. The control of the emission colour stems from a marked difference in the current dependence of intensities of two different emi…
Numerous commercial and military applications exist for guest–host liquid crystal (LC) devices operating in the near- to mid-IR region. Progress in this area has been hindered by the severe lack of near-IR dyes with good solubility in the LC host, low impact on the inherent order of the LC phase, good thermal and chem…
Abstract Poly(methyl methacrylate) (PMMA)/Titanium oxide (TiO 2 ) composite particles were prepared via in‐situ emulsion polymerization of MMA in the presence of TiO 2 particles. Before polymerization, the TiO 2 particles was modified by the silane coupling agent, which is crucial to ensure that PMMA reacts with TiO 2…
Abstract A new class of organic‐inorganic hybrid polymers with well‐defined structure was prepared by reacting diepoxyhexavinyl polyhedral oligomeric silsesquioxanes (DehvPOSS) with diamines of different chain lengths. The structures and properties of these hybrid polymers were well characterized by FTIR, 29 Si‐NMR, G…
Electron beam-induced deposition (EBID) using organometallic precursors is a promising technique for nanometre-sized fabrication, but the deposits have been mostly limited to carbonaceous materials. In this study, vapours of water and iron pentacarbonyl were mixed with precise control and the mixture used as a precurs…
Abstract To effectively modify the properties of an epoxy, branched oligomers were synthesized from ϵ‐caprolactone (CL) and end‐functionalized to realize network precursors that can be reactively blended with the epoxy. The ring‐opening polymerization (ROP) of the CL in the presence of polyglycerol (PGL) initiator (3.…
Abstract Nano‐CaCO 3 /polypropylene (PP) masterbatch containing above 80 wt % nano‐CaCO 3 was prepared by nano‐CaCO 3 coated PP modified by reactive monomers. The chemical interaction, crystallization and melting behavior, thermal stability, morphology, and surface contact angle of masterbatch were investigated with I…
Abstract The phase transitions and the morphology of hard‐segment domains of those siloxane‐containing hard‐segmented polyurethane copolymers are studied by differential scanning calorimetry (DSC). The NH‐SiPU2 copolymer, which comprises a siloxane–urea hard segment and a polytetramethylene ether glycol soft segment (…