Hyperbranched polymers show an outstanding potential for applications ranging from chemistry over nanotechnology to pharmacy. In order to take advantage of this potential, the underlying phase behaviour must be known. From the thermodynamic point of view, the modelling of these phase diagrams is quite challenging, because the thermodynamic properties depend on the architecture of the hyperbranc...

Submitted for the MAR10 Meeting of The American Physical Society Phase equilibria in polymer-blend thin films NIGEL CLARKE, MIREILLE SOUCHE, Durham University — To describe equilibrium concentration profiles in thin films of polymer mixtures, we propose a Hamiltonian formulation of the Flory-Huggins-de Gennes theory describing a polymer blend thin film. We first focus on the case of 50:50 polym...

To improve the solubilization of two water-soluble xyloglucans, tamarind seed polysaccharide and detarium gum, by reducing substantially molecular aggregation, a "pressure cell" heating method was used. Conditions allowing solubilization and chain depolymerization were produced by varying appropriately the pressure, time, and temperature applied. The various MW fractions of solubilized xylogluc...

Based on hard-sphere limit of binary mixtures with different molecular size of components a theory has been developed for calculating activities of solvents in polymer/solvent mixtures. The theory considers various chain configurations for polymer molecules, varying from extended chain to the coiled chain. According to this theory the activity of solvent can be calculated from molecular weights...

We study the elastic and dynamic behavior of a self-avoiding chain confined inside a cylindrical pore using a Flory-type approach and molecular-dynamics simulations. In the Hookean regime, we find that the effective spring constant of the chain is given by keff approximately N(-1)D(-gamma), where N is the number of monomers and D the diameter of the pore. While the Flory approach reproduces the...

Metal detoxification of waste water and industrial effluents are of increasing importance to industrialization in the twenty first century. The ability of coconut (cocos nucifera L) coir dust (CD), carbohydrate toluenediisocyanate resin (CTR) and sulphonated toluenediisocyanate resin (STR) to remove Pb(II) ions from aqueous solution by ion exchange was studied. Percentage ion exchange efficienc...

Evaluation of a surface equation of state generally involves an evaluation of its ability to represent raw experimental data, or information derived from such data, after the parameters of the equation have been adjusted to optimize this representation, followed by an evaluation of the physical reasonableness of the optimizing parameters in terms of the physical model on which the equation of s...

We describe a general strategy, PERM (Pruned-Enriched Rosenbluth Method), for sampling configurations from a given Gibbs-Boltzmann distribution. The method is not based on the Metropolis concept of establishing a Markov process whose stationary state is the wanted distribution. Instead, it starts off building instances according to a biased distribution, but corrects for this by cloning “good” ...

Grave and complicated pollution problems are posed by the existence of heavy metals trendy environment this has been a focus study all over world. The Activated carbonized avocado pear seed (ACAPS) activated orange peel (ACOP) were each soaked with potassium hydroxide (KOH) solution at 1:1 ratio, for 48 hours, outcome was washed, air-dried separately oven dried 105℃ 6 hours further heated in mu...