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Acetic Anhydride - Accelerating Agent for Nitroxide-Controlled Free-Radical Copolymerization of Styrene and Acrylonitrile
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2001
Year
Accelerating AgentEngineeringOrganic ChemistryChemistryControlled Radical CopolymerizationNitroxide-controlled Free-radical CopolymerizationPolymersChemical EngineeringPolymer TechnologyMacromolecular EngineeringPolymer ProcessingPolymer ChemistryAcetic AnhydridePolymer EngineeringRadical CopolymerizationCatalysisPolymer SciencePolymer CharacterizationPolymerization KineticsPolymer ReactionPolymer Synthesis
The influence of acetic anhydride on the controlled radical copolymerization of styrene and acrylonitrile was studied. If benzoyl peroxide/2,2,6,6-tetramethylpiperidine-N-oxyl (BPO/TEMPO) are used the addition of acetic anhydride up to a molar ratio of additive/TEMPO = 2 : 1 results in a twelve times higher rate of polymerization. The molecular weights are increased and the molecular weight distributions are slightly broadened. A further increase of this molar ratio did not accelerate the polymerization rate further, but broadened the molecular weight distributions. Contrarily, the influence of acetic anhydride on the PS-TEMPO controlled radical copolymerization is less pronounced. By means of UV-VIS spectroscopy the reduction of the concentration of free TEMPO through reaction with acetic anhydride at 125°C in ethylbenzene was demonstrated.