The scaling behavior of the order-disorder transition (ODT) temperature for several nearly symmetric P(S-b-I) copolymers has been studied over a polymer volume fraction range of 0.9 e φdiblock e 1. To enable precise control of the concentration at high φ and at elevated temperatures as the concentration approaches the neat melt, compressed CO2 is used as the diluent in place of more traditional...

A facile method for preparing highly monodisperse, sub-micrometre conjugated polymer particles is reported. The particles are prepared through emulsification of a conjugated polymer solution on a microfluidic chip followed by solvent evaporation. The particle size is tuned between 150 nm to 2 μm, by controlling the polymer concentration.

New amphiphilic ABC triblock copolymers have been designed and self-assembled into water-dispersible and biodegradable polymer micelles, which exhibit good antibacterial activities without quaternary ammonium moieties or the loading of any external antibiotics due to the increased local concentration of cationic charge in the polymer micelles compared to the un-self-assembled individual polymer...

The review focuses on responsive/switching behavior of polymer brushes. The structure of the polymer brushes is analyzed in terms of the constitution and conformation of polymer chains. Responsive properties are widely discussed based on phase transition mechanisms in a controlled environment when changes are induced by solvent quality, temperature, concentration of ions, and interactions with ...

– The onset of self-assembly in a dilute aqueous solution containing a flexible polymer and surfactant is theoretically studied. Focusing on the effect of the surfactant on polymer conformation and using a conjecture of local instability (partial collapse) of the polymer at the onset of self-assembly, we obtain several simple predictions: (i) polymer–surfactant self-assembly always starts at a ...

2014 We consider, in a mean field approximation, a polymer solution confined to an acute angle (03B1 ~ 1) wedge with repulsive walls, and obtain the polymer concentration profile and the resulting line tension. We find that the polymer is essentially excluded from the tip zone where the width of the wedge is smaller than polymer correlation length 03BE. The resulting line tension is proportiona...

In this study the polymer composite specimen has been prepared by using polymer Polyvinylpyrrolidone (PVP) a Potassium iodide (KI) and alumina nanoparticles. The polymer composite specimens were developed by using solution cast techniques. The main objective of the project is to study microstructure, XRD, ionic conductivity, ionic transference number, glass transition temperature using DSC, mic...

This Note rationalizes recently measured partitioning of polyethylene glycol, PEG-3400, from bathing solutions of varying polymer concentrations to -hemolysin channels. To explain the concentration dependence of the partition coefficient, we recognize that nonideality of polymer solution in the pore is weak because the overlap volume fraction of the polymer in the pore is higher than that in th...

The effect of a doubly hydrophobically end-capped water soluble polymer (C18-PEO150-C18) on the properties of an oil-in-water (O/W) droplet microemulsion (R ∼ 2.85 nm) has been studied as a function of the amount of added telechelic polymer. Macroscopically one observes a substantial increase of viscosity once a concentration of ∼5 hydrophobic stickers per droplet is surpassed and effective cro...

Mesoporous polymer materials were fabricated from micelle/polymer precursors prepared by the micelle template method in reverse microemulsion systems and the pore size could be tuned by varying the type and concentration of surfactant.