Abstract
Investigation of the curing mechanism of PMR-15 has revealed detailed information regarding reaction pathways and physical. transitions involved during imidization and cross-linking. The oligomeric intermediates formed during staging contain a distribution of different molar mass species of diverse chemical nature, the relative amounts of which vary according to conditions of stoichiometry, temperature, etc. adopted. The cross-linking temperature profile of the oligomers, and physical transitions and further cross-linking/degradative behaviour of the polyimide resin have been eludated via DMTA.
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