Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

Verdazyl radicals as mediators in living radical polymerisation and dopamine end-functionalised polymers for application as friction modifiers

Tools
- Tools
+ Tools

Rayner, Georgina (2012) Verdazyl radicals as mediators in living radical polymerisation and dopamine end-functionalised polymers for application as friction modifiers. PhD thesis, University of Warwick.

[img]
Preview
Text
WRAP_THESIS_Rayner_2012.pdf - Submitted Version

Download (15Mb) | Preview
Official URL: http://webcat.warwick.ac.uk/record=b2565476~S1

Request Changes to record.

Abstract

Verdazyl Radicals as Mediators in Living Radical Polymerisation:
The aim of this work was to investigate verdazyl radicals as an alternative to
nitroxides as mediators in stable free radical polymerisation. Verdazyl radicals and
their unimolecular initiators were synthesised and utilised in the polymerisation of
styrene and n-butyl acrylate. Varying degrees of success was observed in the
polymerisations depending on the structure of the verdazyl radical. The
polymerisation of methyl methacrylate and the copolymerisation of styrene and
methyl methacrylate were also investigated. Correlations between observed
molecular weight and theoretical molecular weight were poor but may be improved
by optimisation of the reaction conditions. Electron paramagnetic resonance was
used to elucidate the radical structure as well as to confirm the living nature of the
polymerisation technique. Electron paramagnetic resonance was also utilised to
provide an insight into radical stability and reactivity in the various reactions
undertaken.
Dopamine End-Functionalised Polymers for Application as Friction
Modifiers:
The aim of this work was to synthesise oil soluble dopamine end-functionalised
polymers for mechanical testing to determine if the polymers can reduce friction by
film formation at a surface. A dopamine based initiator was synthesised and used in Cu(I) and Cu(0) mediated polymerisations with little success and the dopamine
catecholic end-group could not be identified as the polymer end-group. To enable a
successful living polymerisation, the catechol groups on dopamine required
protection. Complete deprotection of the catechol group can be achieved post
polymerisation. The polymerisation of lauryl methacrylate was achieved using a
polymerisation method designed for the long chain, non-polar molecule which
utilised Cu(I)Cl. The polymerisations were scaled up to obtain a baseline, protected
dopamine and deprotected dopamine polymers for mechanical testing. A reduction
in friction and wear observed for the deprotected dopamine polymer, however,
corrosion was also observed and may have affected the results.

Item Type: Thesis or Dissertation (PhD)
Subjects: Q Science > QD Chemistry
Library of Congress Subject Headings (LCSH): Dihydrotetrazinyl, Polymerization, Styrene, Acrylates, Dopamine -- Synthesis
Official Date: January 2012
Dates:
DateEvent
January 2012Submitted
Institution: University of Warwick
Theses Department: Department of Chemistry
Thesis Type: PhD
Publication Status: Unpublished
Supervisor(s)/Advisor: Haddleton, David M.
Sponsors: University of Warwick ; Lubrizol Ltd.
Extent: xxxv, 287 leaves : ill., charts
Language: eng

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics

twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us