Properties of Partially Cured Networks. 2. The Glass TransitionMacromolecules (1985)
The increase of the glass transition temperature during the isothermal cure of a model network formed by the reaction of a,w-dihydroxypoly(propylene oxide) with tris(4-isocyanatophenyl) thiophosphate has been investigated. It is shown that the reaction proceeds first under kinetic control and then under diffusion control upon which is superimposed an intramolecular reaction beyond the gel point. Loop formation occurring
during the intramolecular reaction lea:ds to a decrease in the rate of the Tg increase due to plasticization. The dependence of the Tg change on the degree of cure is treated by ,a WLF approach. The diffusion-controlled part of the cure of the model network investigated and also that of two epoxy resins follow a master curve. Broadening of the glass transition in the model network is attributed t<) the influence of increasing hydrogen bonding between flrethane NH and ether oxygen groups.
- Partially Cured,
- Glass Transition
Citation InformationWilliam MacKnight and Claudius Feger. "Properties of Partially Cured Networks. 2. The Glass Transition" Macromolecules Vol. 18 (1985) p. 280 - 284
Available at: http://works.bepress.com/william_macknight/120/