A novel approach for preparing waterborne corrosion protection polyaniline (PANI)-containing coatings was developed. First, conducting polyaniline/partially phosphorylated poly(vinyl alcohol) (PANI/P-PVA) spherical nanoparticles with significant dispersibility in aqueous media were prepared by the chemical oxidative dispersion polymerization presence of partially (P-PVA). The PANI/P-PVA-containing different PANI/P-PVA contents then prepared, employing epoxy resin as matrix. property on mild...

A novel, facile, and efficient method for the synthesis of tetrahydropyridazines by a one-pot tandem reaction easily accessible ketohydrazones olefins in presence 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) has been successfully developed. The involves initial generation azoalkenes from direct oxidative dehydrogenation using TEMPO as commercially available oxidant, followed subsequent aza-Diels–Alder with olefins.

We measured the viscosity of poly(methyl methacrylate) (PMMA) films supported by silica, where carbonyl group on side chains polymer interacts strongly with hydroxyl groups surface. The result shows that increases decreasing film thickness at temperatures above 110 °C, but displays an opposite trend lower temperatures. A three-layer model, consisting a mobile top layer, bulk-like middle layer and immobile bottom was found to fit data well. detailed breakdown contributions total mobility...

Thermally activated flow dynamics of polystyrene films supported by silicon is studied for a wide range film thickness (h0) and molecular weights (Mw). At low Mw, the effective viscosity nanometer thin smaller than bulk decreases with decreasing h0. This due to enhancement total shear augmented mobility at free surface. As Mw increases, h0 becoming polymer radius gyration (Rg), switches from being substrate-independent substrate-dependent. We propose that interfacial slippage then dominates...

Abstract High‐strength and high‐toughness nanofibers were made from polyimide 6F‐PI through electrospinning. The had a backbone up with 3,3′,4, 4′‐biphenyl‐tetracarboxylic dianhydride 2,2‐bis[4‐(4‐aminophenoxy)phenyl]‐hexafluoro‐propane residues. Electrospun precursor collected in the form of aligned fiber sheet on rim rotating disc. Heating process converted sheets to nanofiber sheets. Gel permeation chromatography Ostwald Viscometer used determine molecular weight distribution precursor,...

Numerous studies have shown that the glass transition temperature, Tg, of polymers may change visibly upon addition even small amounts nanoparticles. In this study, we examine effect polymer–nanoparticle interfacial energy on phenomenon in nanocomposite films containing polystyrene-grafted nanoparticles mixed with polystyrene homopolymer at low particle loadings. A previous experiment showed system modulates grafting density grafted polymer and molecular weight ratio matrix polymers. We find...

A novel method for the synthesis of trifluoromethyl-containing 1′H-spiro[azirine-2,4′-quinolin]-2′(3′H)-ones by a CF3-radical-triggered tandem reaction benzene-linked 1,7-enynes is described. This protocol utilizes 1-trifluoromethyl-1,2-benziodoxole as trifluoromethylating reagent and TMSN3 aminating reagent. By this method, various potentially bioactive trifluoromethylated were facilely synthesized via radical cascade process.

Abstract BACKGROUND: Thiol–ene networks are of interest due to their facile photopolymerization and open network structure. In this work, an allylic disulphide divinyl ether monomer is reacted with tetrathiol monomers, which allows the structure permanently change in shape if stressed while under irradiation. We also study photo‐differential scanning calorimetry (DSC) kinetics photorheology during cure dynamic mechanical properties after cure. RESULTS: The heat polymerization similar for...

Abstract Four new monomers, 3‐( N ‐methylacrylamido)propylidenebisphosphonic acid, ‐propyl‐acrylamido)propylidenebisphosphonic ‐hexylacrylamido)propylidenebisphosphonic and ‐octylacrylamido)propylidenebisphosphonic have been synthesized in good yields fully characterized by 1 H, 13 C, 31 P NMR, HRMS. The copolymerization of these monomers with N,N ′‐diethyl‐1,3‐bis(acrylamido)propane (DEBAAP) has investigated differential scanning calorimetry. These mixtures show a higher reactivity than...

Abstract Photo‐differential scanning calorimetry (photo‐DSC) and UV‐visible spectrometry were used to investigate the photocuring kinetics of visible light initiated cationic photopolymerization triethyleneglycol divinyl ether with a diphenyl iodonium salt three photosensitizers, 1‐chloro‐4‐propoxy‐9H‐thioxanthen‐9‐one (CPTXO), acridine orange (AO), camphorquinone (CQ). Although all photosensitizers effective in causing photopolymerization, CPTXO AO photo‐reacted during irradiation; whereas...

We have measured the effective viscosity of polystyrene films with a small (4 wt %) added amount dioctyl phthalate (DOP) deposited on silica. A broad range molecular weights, Mw, from 13.7 to 2100 kg/mol was investigated. Our result shows that for thin Mw < ∼100 addition DOP causes decrease by factor ∼4, independent Mw. But higher films, creeps toward neat increasing model assuming be dominated enhanced surface mobility lower but surface-promoted interfacial slippage is able account...

A new diepoxide monomer (ADTDE) containing an allylic dithioether moiety has been synthesized to extend the suite of monomers that form networks exhibiting radical-mediated photoplasticity. These cross-linked polymers show permanent shape change under load and stress relax only when stimulus visible or UV radiation. The Lewis base-catalyzed reaction epoxide groups in ADTDE with tri- tetrafunctional thiols was monitored by differential scanning calorimetry infrared spectroscopy. curing...

Abstract A simple technique employing differential scanning calorimetry (DSC) to investigate the molecular structure of ethylene copolymers is presented in this paper. Three commercial Ziegler–Natta catalysed linear low density polyethylenes (LLDPE) and a single‐site very polyethylene (VLDPE) were subjected continuous cooling at slow rate 0.08 °C min −1 . Like other thermal fractionation techniques, (SCC) segregates polymers according their branching density, allowing short chain (SCB),...

The proper combination of material (i.e. fluorinated polyimides) and processing technique (electrospinning) could lead to the formation polyimides with low dielectric constant, high thermo‐oxidative stability glass transition temperature, hydrophobicity. in this work were based on 4, 4‐bis [3′‐trifluoromethyl‐4′ (4′‐amino benzoxy) benzyl] biphenyl (Q) various non‐fluorinated dianhydrides namely benzene‐1,2,4,5‐tetracarboxylic dianhydride, 3,3′,4,4′‐biphenyltetracarboxylic...

Viscosity of polymer nanocomposites evolves unexpectedly slowly. The resulting variations in the viscosity ratio depend on particle–polymer interfacial condition.

The temperature dependence of photopolymerization kinetics tetrakis[(methacryloyloxy)ethoxy]silane (TetMESi) was compared with an analogue, diethylene glycol dimethacrylate and their copolymers. In all cases, the are controlled by propagation step, effect diffusion on radical termination, rising glass transition during cure, topological restraint complete conversion. regions these polymers were very broad, suggesting use in high applications. NMR TetMESi monomer, FTIR water sorption...

Abstract Differential scanning calorimetry was employed to monitor the thermal polymerization and photopolymerization kinetics of divinyl ethers by temperature‐ramping isothermal modes, respectively, with a diphenyl iodonium salt photoinitiator thioxanthenone photosensitizer. For triethylene glycol ether (TEGDVE), peak temperature (i.e. at maximum rate) decreased increased concentration reduced rate, but final conversions were all very high (&gt;90%). The exotherm extremely narrow,...