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The polyaniline (PANi)/MnFe2O4 nanocomposite containing hollow ferromagnetic nanoparticles has been synthesized. This report is a helpful method to improve mixability of inorganic particles with an organic phase. The results of atomic force microscopy image indicate the even distribution of MnFe2O4 in the PANi base, and this proves the effectiveness of dodecyl benzene sulfonic acid and ultrasonic devices in mixing two non-homogenous phases.
Using off-lattice Monte Carlo simulation, the critical value of Flory–Huggins parameter, χ, for flexible–semiflexible (isotropic–isotropic) polymer systems as a function of stiffness of semiflexible components has been estimated. The simulation data were compared with that of mean field and it was found that both agree very well. Interfacial tension and width of flexible–semiflexible polymer systems had been studied for strong segregation and weak segregation limits.
Interactions between brush-like segments were calculated both in perturbation and smoothed-density scheme. The figure schematically illustrates the considered interactions between two brush-like segments, where the thick and thin solid lines represent the main and side chains, respectively, whereas the dashed lines connect interacting segments. The calculated results were compared with experimental values for polystyrene polymacromonomers.
Atomic force microscopy (AFM) phase images for the ridge and valley regions of the water-etched poly(ethylene oxide)/poly(L-lactic acid) (50/50) blend crystallized at crystallization temperature (Tc)=110 °C. The AFM graph (5 μm×5 μm) of the ridge region b shows a texture different from that of the valley region c. The surface patterns of the lamellae in the valley and ridge in these two regions appeared as flat-on and edge-on lamellae, respectively. The anisotropicity of the platelet crystals in these two regions was also apparently different. The orientation of the crystal lamellae in the valley (region c) was circumferential, whereas that of the lamellae in the ridge (region b) was radial. The difference in orientation in the ridge and valley regions may account for the cracks in the ridge regions but not in the valley region.
Poly(ethylene glycol)-armed Ru(II)-bearing microgel star polymers, directly obtained from ruthenium-catalyzed living radical polymerization, were used as catalysts for transfer hydrogenation of ketones in 2-propanol. Owing to the good affinity of the core-reaction pocket and the surrounding arms to substrates and products, respectively, the star polymer catalysts homogeneously hydrogenated various ketones into the corresponding alcohols more efficiently than the other polymer-supported catalysts and the original ruthenium counterpart. The catalyst encapsulation into the unique microgel core further afforded efficient catalyst recycle and facile product recovery.
pH-responsive poly(6-(acrylamido)hexanoic acid)-grafted silica particles (PAaH-SiO2) were prepared via reversible addition-fragmentation chain transfer (RAFT)-controlled radical polymerization using the chain transfer agent immobilized silica particles. Millimeter-sized ‘liquid marbles’ can be prepared using the pH-responsive PAaH-SiO2 particles. The ‘liquid marble’ can be transferred intact onto the surface of neutral or acidic water pool, which exhibited long-term stability. When pH of the water pool was changed to alkaline, ‘liquid marble’ burst immediately on the surface of the water pool.
At the end of the copolymerization procedure in supercritical carbon dioxide, biodegradable/biocompatible triblock stabilizer remained in the product. The presence of the stabilizer provided the copolymer product with higher yield and molecular weight in random highly porous shapes.
An investigation has been undertaken to find out the effect of different polyfunctional monomers (PFMs) on the properties of chlorinated polyethylene (CPE) crosslinked by electron beam (EB). Physico-mechanical properties of EB-irradiated samples were compared with the dibenzoyl peroxide-cured samples. Dependence of properties on irradiation dose was determined from a dose range of 0–20 Mrad. The results showed an increase in physico-mechanical properties as a result of introducing PFMs, the most efficient being triallyl cyanurate (TAC) and triallyl isocyanurate (TAIC).
Impact modification of poly(ethylene terephthalate)–poly(butylene terephthalate) blend using different impact modifiers was carried out in this research work and the results were co-related using various analytical techniques.
