Can You Really Do Chemisty Experiments About Piperidine-2,6-dione

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Investigation of solid-state transitions in linear and crosslinked amorphous polymers

This paper deals with the determination of the main characteristics and the assignment of the molecular motions leading to the solid-state transitions observed in amorphous polymers at temperatures lower than the glass-rubber transition. First, the specific features of these secondary transitions (beta, gamma, delta, …) are briefly described. Then, the behaviour of various polymer systems is analysed: poly(cycloalkyl methacrylates) and their intracycle motions, poly(ethylene rere-phthalate) and bisphenol A polycarbonate beta transition and the effect of small molecule antiplasticisers, aryl-alkyl polyamide transitions, the beta transition of poly(methyl methacrylate) and its maleimide as well as glutarimide random copolymers. Additionally linear polymers, aryl-aliphatic epoxy systems, with or without antiplasticisers, illustrate the case of crosslinked amorphous polymers. Whereas all the systems considered were investigated by dynamic mechanical measurements and 13C solid-state nuclear magnetic resonance experiments, some systems were also studied by other techniques such as dielectric relaxation and molecular modelling. Poly(methyl methacrylate) and bisphenol A polycarbonate constitute the best examples of the level of description of the molecular motions involved in the beta transition and, in particular, the nature and extent of the cooperativity which develops in the high-temperature part of the transition. This is achieved by combining all the experimental and modelling techniques presently available. Springer-Verlag Berlin Heidelberg 2005.

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Reference£º
Piperidine – Wikipedia,
Piperidine | C5H1205N – PubChem