Morsley, David Robert (1999) The catalytic chain transfer emulsion polymerisation of acrylic monomers. PhD thesis, University of Warwick.

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Abstract

This thesis has explored the synthesis of macromonomers by Catalytic Chain
Transfer (CCT) emulsion polymerisation.
It has been shown that the effective synthesis of methacrylate macromonomers
using catalyst concentrations below a threshold level is not possible since the
viscosity in the particles becomes too high to allow efficient movement of the
CCT agent between latex particles. It has been demonstrated that an addition of
a shot of monomer at the start of the reaction is necessary to allow effective CCT
to occur.
The addition of the water soluble methacrylate monomer HEMA to a methyl
methacrylate CCT emulsion polymerisation was shown to have little effect on
the transfer reaction. Macromonomers consisting of a statistical mixture of
MMA and HEMA can therefore be easily prepared by CCT emulsion
polymerisation.
The results of CCT emulsion polymerisation where the synthesis of butyl
acrylate/ methyl methacrylate macromonomers were attempted were also
outlined and effective macromonomer synthesis was observed for low amounts
of acrylate. For higher amounts of acrylate it was observed that effective
macromonomer synthesis was only observed up to moderate conversions.
The synthesis of methacrylic acid containing macromonomers using CCT
emulsion polymerisation was studied and it was shown that controlled
macromonomer synthesis could only be carried out at low methacrylic acid
concentrations.
Results described show that the effectiveness of the CCT emulsion
polymerisation process is very dependant on the solublity of the catalyst. The
more the CCT agent is soluble in the monomer and hence particle phase the
greater the observed transfer constant. If the catalyst is too soluble in the
monomer the observed transfer constant is greatly reduced due to the inability of
the catalyst to transport from the monomer droplets to the particles effeciently.

Item Type:	Thesis or Dissertation (PhD)
Subjects:	Q Science > QD Chemistry
Library of Congress Subject Headings (LCSH):	Macromolecules -- Synthesis, Emulsion polymerization, Methacrylic acid -- Synthesis
Official Date:	December 1999
Dates:	Date Event December 1999 Submitted
Institution:	University of Warwick
Theses Department:	Department of Chemistry
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Haddleton, David ; Richards, Stuart
Sponsors:	University of Warwick
Extent:	xxii, 203 p.
Language:	eng

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