Sol-Gel Transition Curve of Poly(vinylidene fluoride) in Organic Solvents.

Effect of Collagen Gel on Sciatic Nerve Regeneration in the Polyvinylidene Fluoride Tube

Background: The limited availability of donor sites for nerve grafting has continued to stimulate research toward finding suitable alternatives for autograft. The aim of this research was to study the effect of piezoelectric channel and collagen gel on nerve regeneration. Materials and methods: This research is an experimental study. Forty eight male rats (200-250 gr) were used. After axotomy...

Flow birefringence at the sol-gel transition

2014 The information provided by a flow birefringence experiment at the sol-gel transition in the sol phase is discussed There are two competing effects : cluster rotations, and cluster elastic deformation. In a steady state, rotational effects turn out to be dominant. For small velocity gradients S we predict an extinction angle x such that 03C0/4 x diverges with an exponent roughly equal to 3...

Viscoelastic Properties for Sol-Gel Transition

Two Simple Approaches to Sol-Gel Transition

We represent a theory of polymer gelation as an analogue of liquid-glass transition in which elastic fields of stress and strain shear components appear spontaneously as a consequence of the cross-linking of macromolecules. This circumstance is explained on the basis of obvious combinatoric arguments as well as a synergetic Lorenz system, where the strain acts as an order parameter, a conjugate...

Entropic Elasticity at the Sol-Gel Transition

The sol-gel transition is studied in two purely entropic models consisting of hard spheres in continuous three-dimensional space, with a fraction p of nearest neighbor spheres tethered by inextensible bonds. When all the tethers are present (p = 1) the two systems have connectivities of simple cubic and face-centered cubic lattices. For all p above the percolation threshold pc, the elasticity h...