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Hydrophilic surfaces based on linear polyglycidol (poly(2,3-epoxypropanol-1)) were prepared to examine protein-surface interactions. The grafting-to technique was applied to covalently attach the polyglycidol and its block copolymer with poly(ethylene glycol) to the silica wafers. Two types of surfaces with different polymer chains binding to the substrate were prepared and its ability to reduce the...
Nitrile rubber (NBR) is an unsaturated copolymer of acrylonitrile and butadiene. Due to its excellent oil-resistance, NBR products are widely used such as in the automotive and aerospace industries. This paper discusses the fabrication of acrylonitrile butadiene copolymer fibers via electrospinning. A transition from electrospray to electrospinning mechanism was observed and investigated by varying...
23Na NMR spectroscopy was used to study complexation of sodium cations (NaClO4) with a few of star-shaped polyethers. The bonding of sodium ions by these polymers having PEO arms and with model compounds has been studied in anhydrous methanol solutions. In this paper the preliminary studies are presented, indicating that star polymers built from PEO arms and core formed from diepoxides, containing...
Process and nanoparticle induced piezoelectric super toughened poly(vinylidene fluoride-co-hexafluoro propylene) (HFP) nanohybrids have been developed for device application. The nanohybrids have been prepared by incorporating organically modified nanoclay through solution route. The nanohybrids show improvement in toughness and modulus along with piezoelectric phases compared to pure HFP. Piezoelectric...
Deoxyribonucleic acid (DNA) was investigated as a flame retardant (FR) additive for melt-compounded formulations with low-density polyethylene (LDPE) and compared to LDPE compounded with melamine polyphosphate (MPP), one of the industry standard intumescent FR additives for plastics. DNA showed a much greater compatibility with the LDPE matrix than MPP. At high loading levels, DNA showed minimal increases...
Strain Induced Crystallization (SIC) of Natural Rubbers (NR) with different network chain densities (ν) is studied. For the weakly vulcanized rubber, the melting stretching ratio λm at room temperature is the lowest. This is correlated with larger crystallites in this material measured by in situ WAXS, suggesting their higher thermal stability. SIC kinetics is then studied via stretching at various...
In this study, a new biodegradable cross-linker agent based on fructose was reported for fabrication of brain targeted molecularly imprinted polymer (MIP). The applied strategy for targeting drug delivery was based on two mechanisms. Firstly, the magnetic structure of prepared MIP which facilitates the aggregation of carrier near target tissue under magnetic field. Second, the tendency of brain cell...
We fabricated composite hydrogels using surface-modified cellulose nanofiber (CNF) as a multifunctional crosslinker and N-isopropylacrylamide (NIPAM) as a monomer. Surface modification of CNF was performed using maleic anhydride (MA), which endowed the CNF with not only aqueous dispersibility but also vinyl polymerizability. We characterized the MA-modified CNF (MACNF) using wet chemical analysis,...
The structural and optoelectronic properties of several substituted poly[N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole) (PCDTBT) conjugated oligomers have been investigated by density functional theory (DFT) and time-dependent density functional theory (TD-DFT). Various electron-withdrawing and electron-donating groups were attached to the 5′ position of the...
The morphology of symmetric and asymmetric membranes obtained by precipitation can be rationalized by thermodynamic and kinetic parameters. Such parameters which the former relates to thermodynamic effect and the latter controls the time of separation of the cast solution film immersing in the non-solvent bath from the glass plate were calculated as dimensionless parameters for further analysis. Phase...
Surface-initiated Atom Transfer Radical Polymerization is an established technique for synthesis of polymer brushes via “grafting from” method. However, dynamic behavior of surface-tethered macromolecules during their growth requires more detailed studies to obtain uniform polymer brush films. It was addressed here by varying solvent composition in grafting of poly(N-isopropylacrylamide) brushes....
In the present work, a new method is developed for the preparation of polyethylene magnetic nanocomposites by in situ polymerization. Carbon nanotubes (CNTs), synthesized by the chemical vapor deposition method using ferrocene as the precursor and catalyst and silica (SiO2) as the support, were used as fillers and compared with a commercial CNT. The synthesized nanofillers had iron magnetic particles...
Surface modification of porous membranes for water filtration has been extensively reported in the literature to improve fouling resistance. However, surface modification can significantly change the membrane filtration properties, sometimes resulting in more severe fouling than with the original, unmodified membrane. This study focused on demonstrating surface modification strategies and membrane...
Thermoelectric (TE) energy conversion is based on electronic transport, and high TE performance requires both high electrical conductivity and high thermopower (or Seebeck coefficient). High electrical conductivity can be achieved by increasing the electronic carrier concentration but this diminishes thermopower, which has been one of the major hurdles in further improving TE performance. Here we...
The development of nanoscale morphologies for a molten compressible polymeric surfactant is investigated by using a recently formulated self-consistent field theory. A linear ABC block copolymer is taken as our model system that allows a disparity in the propensities for curved interfaces and in pressure responses of ij-pairs. The interplay of those features leads the copolymer to new morphologies...
Design and synthesis of highly efficient branching agent (“inimer”) to prepare hyperbranched architectures with tunable physical and chemical properties is one of the most challenging and interesting topic to the polymer community. Here, we report the rational design of a new polyhedral oligomeric silsesquioxane (POSS) containing “inimer” and employed in reversible addition-fragmentation chain transfer...
Regioregular polyalkylthiophene copolymers were prepared by oxidative copolymerization of known amounts of brominated alkylthiophene monomers possessing or not a reactive bromide group linked at the end of the alkyl chain. Subsequent post-polymerization functionalization with tetraphenylporphyrin led to products with differing dye content in the side chain. Due to their chemical structure, the copolymeric...
In order to simulate the effect of non-rubber components on strain-induced crystallization (SIC) in natural rubber (NR), sacrificial metal-ligand bonds are incorporated, for the first time, into cis-1,4 polyisoprene cured by sulfur. The incorporation of sacrificial bonds is found to bring in much smaller onset strain for SIC and higher crystallinity compared with the cis-1,4 polyisoprene with sulfide...
We present a new route of tethering graphene nanoplatelets (GNPs) with Fe3O4 nanoparticles to enable their alignment in an epoxy using a weak magnetic field. The GNPs are first stabilized in water using polyvinylpyrrolidone (PVP) and Fe3O4 nanoparticles are then attached via co-precipitation. The resultant Fe3O4/PVP-GNPs nanohybrids are superparamagnetic and can be aligned in an epoxy resin, before...
3D hydrogel environment with both unique properties of nanofibrous structure and electrical character can provide a promising scaffold for skeletal muscle tissue engineering approaches. Herein, the poly acrylic acid (PAA)-based hydrogel was engineered to conductive one by aniline polymerization in the form of nanofibers. The poly aniline (PANi) nanofibers were made by the optimized chemical reactions...
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