Characterization of crosslinking of random polymer network by rheological and equilibrium swelling data

Abstract

SYNOPSISThe transesterification reaction in the molten state of ester groups of ethylene vinyl acetate (EVA) copolymers and ethylene acrylic ester (EMA) copolymers has been used to crosslink the chains of this polymeric system. The relative EVA copolymers (or EMA copolymers) concentration dependence of the network formation by co-crosslinking of EVA/EMA miscible blends has been assessed. EVA/EMA networks were characterized by swelling experiments, rheological measurements, and determination of the extent of the reaction through a chromatographic technique. All results can be compared in a master curve. The influence of the polydispersity and the microstructure of EVA and EMA samples was put in evidence. On the other hand, a scaling law ( u Z -M , -~'~) was observed in agreement with predictions of the Flory-Rhener expression.

EVA reactive blending with Si–H terminated polysiloxane by carbonyl hydrosilylation reaction: From compatibilised blends to crosslinking networks

“…In a previous study [18], it was found that c is n 2 dependent for the EVA/toluene system, according to…”

“…Its amount of vinyl acetate (VA) was 28% by weight, corresponding to a molar composition of 10.6% of VA units. The number average molar mass and weight average molar mass of 19,000 g mol À1 and 53,500 g mol À1 , respectively, were measured by size exclusion chromatography in trichlorobenzene at 135.8 C [18]. EVA 2803 had a melting point of around 75 C and a zero shear viscosity of 1.0 Â 10 4 Pa s at 115 C.…”

A new route for organic–inorganic hybrid material synthesis through reactive processing without solvent

“…Its amount of vinyl acetate units (VA) is 28% by weight [21,22], which corresponds to a molar composition of 10.6% of VA units. It presents a melting point around 75 8C.…”

Structural evolution of a constrained epoxy functional polyethylene network crosslinked by a bio-based reactant

“…Indeed, more precise determination requires that both loss and storage moduli are measured at several frequencies, but the present discussion of rheological experiments focuses on the storage and loss moduli crossover, as this crossover is generally close to the gel point for polymer network precursors [45,46].…”