Effect of chemical structure and crosslinking density on the thermo-mechanical properties and toughness of (meth)acrylate shape-memory polymer networks

Thermal aspects of the kinetics of dimethacrylate photopolymerization

Chemico-diffusion kinetics of model epoxy-amine resins

Unsaturated polyester (UP) resins are linear polycondensation products based on unsaturated and saturated acids/anhydrides and diols or oxides. These resins are generally pale yellow oligomers with...

Current Status of Unsaturated Polyester Resins

Yielding behaviour in model epoxy thermosets — I. Effect of strain rate and composition

The glass-transition region of crosslinked polymers prepared from poly(1,2-propylene phthalate fumarate) and styrene was studied using a torsion pendulum. The glass-transition temperature and the modulus in the rubbery region of these polymers were analyzed in terms of the crosslink density. The styrene concentration at which the maximum crosslink density occurs, as estimated from the viscoelastic data, is found to be in agreement with estimates made by other workers using chemical methods.

Relaxations in the transition region of crosslinked polyesters. II. The glass transition

The glass transition region of styrene-crosslinked poly(1,2-propylene phthalate fumarate) was studied using a torsion pendulum. The region was composed of two separate relaxations. The major relaxation was the glass transition of the whole network, while the minor relaxation, at a lower temperature, was ascribed to the polyester segments between the crosslinks. A comparison was made between these relaxations and these observed in related polyester networks.

Relaxations in the transition region of crosslinked polyesters. I. The β relaxation

An analysis of the effect of crosslinking on the Tg of polyester and other networks

The low-temperature γ′ relaxation was found to originate in the diol units of a variety of crosslinked polyesters. The results were explained in terms of Boyer's Crankshaft model. As the polyester concentration in the networks increased, the γ′ relaxation shifted to higher temperatures and the intensity of the relaxation increased but not as rapidly as the diol concentration. This behaviour was interpreted in terms of an interaction of the relaxing species with the surrounding matrix.

Wayne D. Cook

Papers

Relaxations in the transition region of crosslinked polyesters. II. The glass transition

Relaxations in the transition region of crosslinked polyesters. I. The β relaxation

An analysis of the effect of crosslinking on the Tg of polyester and other networks

Low‐temperature relaxations in styrene‐crosslinked polyester networks. II. The γ′ relaxation

Low‐temperature relaxations in styrene–crosslinked polyester networks