Vulcanization several rubbers with cyclohexasulfide.

Theory & Practice Of Vulcanization

Critical behaviour for vulcanization processes

2014 We consider a polymer melt, with polymerization index N and a fraction p of cross linked monomers, for values of p close to the gelation threshold (p = 03C1c + 039403C1). Using a Ginsburg argument, we find that (in three dimensions) the Flory theory is qualitatively correct whenever N > (03C1c/039403C1)3. For shorter chains the critical exponents are expected to be of the percolation ...

Phase transitions of nematic rubbers

– Single-crystal nematic elastomers undergo a transition from a strongly ordered phase N to an “isotropic” phase I. We show that: a) samples produced under tension by the Finkelmann procedure are intrinsically anisotropic and should show a small (temperaturedependent) birefringence in the high-temperature I phase; b) for the I → N transition via cooling there is a spinodal limit but for the N →...

Density-correlator signatures of the vulcanization transition

Certain density correlators, measurable via various experimental techniques, are studied in the context of the vulcanization transition. It is shown that these correlators contain essential information about both the vulcanization transition and the emergent amorphous solid state. Contact is made with various physical ingredients that have featured in experimental studies of amorphous colloidal...

Vulcanization and the Properties of Rubber

Rubber is composed of long stringlike polymer molecules, which are pinned together at random points by crosslinks. As the density of crosslinks is increased, the molecules get localized and the system undergoes a phase transition from a liquid to an amorphous solid state. The elastic properties of the resulting solid are very different from those of metals, and are primarily due to changes in t...