Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.481545
Title: The synthesis and polymerization of methacrylate macromonomers
Author: Topping, Clare
ISNI:       0000 0001 3535 2274
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1998
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Abstract:
Macromonomers of a range of functional methacrylate monomers are prepared using a catalytic chain transfer agent. The lower molecular weight oligomers, e.g. dimer, trimer, are isolated by reduced pressure distillation and characterised by IR and *H and 13C NMR spectroscopy. It has previously been established in the published literature that methacrylate macromonomers can undergo three different types of reaction when added to radical polymerizations. They can copolymerize or undergo an addition- fragmentation reaction ((5-scission) or they can undergo a depropagation mechanism along the backbone to yield the starting materials. This (5-scission mechanism is utilised to prepare a range of telechelic methacrylate polymers using functional dimers, some of which have been shown to undergo further reactions. The chain transfer constants of MMA dimer, MMA trimer and BMA trimer in bulk polymerizations of MMA and BMA are determined using an integrated form of the Mayo equation. The trends seen in these values are related to differences in structure between the macromonomers. The BMA and MMA dimers and trimers are added to group transfer polymerizations of MMA and BMA and the resulting polymers analysed by SEC and MALDI-TOF mass spectrometry. The dimers copolymerize with one or two dimer units adding to each chain whereas trimers undergo a chain transfer reaction to form a new initiating species. The addition of dimer, trimer and tetramer all lead to a reduction in molecular weight.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.481545  DOI: Not available
Keywords: QD Chemistry
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