A kinetic study of some free radical polymerisation reactions

Henderson, William (1963) A kinetic study of some free radical polymerisation reactions. PhD thesis, University of Glasgow.

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In part one of this thesis some of the methods of determining the rate of intiation in a polymerisation reaction proceeding by free radical Mecthanism have been studied and compared. All of the measements relate to the photoinitiated polymerisation of methyl methacrylate in bulk using 1:1' zobis-isobutyronitrile (A1BN) as tre iritiator. The stable fre. oe disel, 1:1' diphenyl-2-piuryorazul, (DPPH.) , has frequently been used as an inhoitor in polymerizations. The rate of removal of DPPH. has been meastred ann equated to the rate of initiation. The rare of disappearance of DPPH. has been followed dilatometrically and spectrophotomatrieall. And DPPH. has also beer used as a radial seavenger in an inert solvent. The rate of initiation has also been evaluated from the number average degree of polymerisation and the rate of polymerisation. The kinetic chain length has been measured, and it is shown that an unambiguous value for the rate of initiation can be obtained from the value of the kinetic chain length together with that of the rate of polymerisation. The values obtained using DPPH. and by measurement of the kinetic chain length have been compared and the differences have been explained in terms of the efficiency of initiation of polymer chains by AIBN. in efficiency of about 605 has been found. The kinetic chain, length and the number average degree of polymerisation have been compared and it 1-confirmed that the termination process between polymethyl methacrylate radicals occurs mainly by disproration at 25

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Additional Information: Adviser: W I Bengough
Keywords: Polymer chemistry
Date of Award: 1963
Depositing User: Enlighten Team
Unique ID: glathesis:1963-73104
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 14 Jun 2019 08:56
Last Modified: 14 Jun 2019 08:56
URI: https://theses.gla.ac.uk/id/eprint/73104

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