2014 The phase equilibrium in polymer-solvent systems has been described in terms of the Landau-Ginzburg-Wilson model. The scaling law for the coexistence curve which has been derived in the present article is in good agreement with the experimental data. The prediction of the present theory that the scaling region narrows with increasing degree of polymerization, is consistent with the experim...

The rational development of sustainable polymeric materials demands tunable properties using mixtures polymers with chemical variations. At the same time, sheer number potential variations and combinations makes experimentally or numerically studying every new mixture impractical. A direct predictive tool quantifying how material change when molecular features provides a less time- resource-con...

Proteins, chain molecules of amino acids, behave in ways which are similar to each other yet quite distinct from standard compact polymers. We demonstrate that the Flory theorem, derived for polymer melts, holds for compact protein native state structures and is not incompatible with the existence of structured building blocks such as alpha helices and beta strands. We present a discussion on h...

The addition of a macromolecular crowding agent to a dilute solution of polymer exerts a compressive force that tends to reduce the size of the chain. We study here the effect of changing the size ratio between the random coil and the crowding agent. The compression occurs at lower crowding agent concentration, Φ when polymer molecular weight increases. The Flory exponent ν(Φ) decreases from ν(...

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ii) a exible polymer with rigid bonds and iii) a exible polymer with exible bonds. The use of a very e cient pivot algorithm has made it possible to simulate very long chains, with up to several thousand titrating groups. The results have been compared to a mean eld approximation for a rigid rod and variational results emanating from a Flory type approach. It is found that the rigid rod mean el...

The renormalized elasticity Jheory for jsolated flexible polymers developed recently by de Gennes is extended to the case of strong elongation ( Z / R F >> 1,Z is the average end-to-end length in response to a uniform tension and R F is the excluded volume Flory radius !fa free coil). I t is shown that, in this regime, the elastic restoring force f is nonlinear in the distortion and varies as Z...

Carothers and Flory established the fundamental principles of homogeneous two-component polycondensation reactions by which a variety of commonly used polymers such as polyesters and polyamides (nylons) are synthesized even now. One of the most critical factors to achieve a high degree of polymerization is a strict adherence of stoichiometric balance of the two components. An imbalanced ratio o...