By Kelly A. Davis
The layout and the realisation of good outlined polymer architectures has develop into a major aim in macromolecular technology. The prerequisite for attaining this objective is the provision of managed polymerisation reactions. dwelling anionic polymerisation was once the 1st response pleasing those necessities. Cationic polymerisation in basic terms got here into play whilst it used to be realised that it used to be attainable to create an equilibrium among energetic and dormant species with the fraction of the dormant species being a ways enhanced to that of energetic ones. A corresponding precept applies to managed radical polymerisation according to shaped in a range of of modes reminiscent of nitroxide mediated polymerisation (NMP), atom move radical polymerisation (ATRP), reversible addition frag mentation chain move (RAFT) or catalytic chain move (CCT) reactions. All of those variations of managed radical polymerisation result in good outlined archi tectures with the actual virtue a lot greater variety of monomers are appropriate and the response stipulations are less difficult than these of residing ionic polymerisation reactions. even though in managed radical polymerisation, termination reactions can't be excluded thoroughly, they're restricted of their volume and accordingly the mol ecular weight is managed, the polydispersity index is small and functionalities should be hooked up to the macromolecules. those positive factors are indicative of the true isation of good outlined polymer architectures equivalent to block copolymers, celebrity formed and comb formed copolymers.
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Additional info for Statistical, gradient, block and graft copolymers by controlled, living radical polymerizations
Sample text
Fm Seite 52 Dienstag, 25. A. Davis · K. Matyjaszewski synthesis was reversed and pSt macroinitiators were used for nBMA polymerization, the results were similar. Again, the molecular weight distributions broadened after chain extensions [184]. Ying et al. prepared block copolymers of both MMA and HEMA with St [186]. 28, respectively [186]. 28) was chain extended with St, the macroinitiator was consumed slowly at 110 °C, as evidenced by the presence of a low molecular weight shoulder in the GPC traces that persisted until >40% monomer conversion.
Fm Seite 35 Dienstag, 25. Juni 2002 9:45 09 3 Linear Block Copolymers 35 pared containing an a-carboxy functionality was used successfully to prepare the functional copolymers, which were proposed for different types of postfunctionalization reactions [101]. Armes et al. prepared TEMPO-capped poly(sodium 4-styrenesulfonate) (SSt) using potassium persulfate as the initiator in refluxing solution of a 3:1 v:v mixture of ethylene glycol and water at 120 °C [150], which was then used as a macroinitiator for the successful preparation of block copolymers with 4-(dimethylamino)methylstyrene (DMAMS) and sodium 4-styrenecarboxylate (SSC).
186] Ying et al. [186] Ying et al. [186] Pan et al. [187] Schubert et al. [188] Qiu et al. fm Seite 55 Dienstag, 25.
