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Now showing items 41-50 of 71
Synthesis and characterization of tailored polyurethane coatings
(Stellenbosch : University of Stellenbosch, 2005-12)
Aqueous polyurethane (PU) dispersions were synthesized for use in paper coatings. These
PUs contained a polyester polyol soft segment (content of between 65 to 75%) and a
urethane hard segment (content of between 30 to ...
Synthesis and morphological characterization of segmented and branched polydimethylsiloxane-polyester copolymers
(Stellenbosch : University of Stellenbosch, 2010-03)
ENGLISH ABSTRACT:
Polydimethylsiloxane–polyester (PDMS-PES) copolymers produce materials which have
enhanced properties and take advantage of the unique properties of the two very dissimilar
components. The dissimilar ...
NMR studies of radical polymerization processes
(Stellenbosch : Stellenbosch University, 2012-12)
ENGLISH ABSTRACT: Examples
of
the
use
of
NMR
spectroscopy
in
the
study
of
radical
polymerization
processes
have
been
described.
The
studies
presented
have
made
a
significant
contribution
to
the
...
Molecular weight effects on crystallization of polypropylene
(Stellenbosch : University of Stellenbosch, 2011-03)
ENGLISH ABSTRACT: The crystallization of polyolefins is an important parameter in determining the properties of
such materials. The crystallization phenomenon generally depends on the molecular
symmetry (tacticity) and ...
New approaches to the synthesis and exfoliation of polymer/functional graphene nanocomposites by miniemulsion polymerization
(Stellenbosch : Stellenbosch University, 2012-03)
ENGLISH ABSTRACT: New methods are described for the synthesis of polymer/graphite nanocomposites using the
miniemulsion polymerization process. Natural graphite was functionalized by oxidation to
produce graphite oxide ...
Self-healing coatings based on thiol-ene chemistry
(Stellenbosch : University of Stellenbosch, 2009-03)
The work presented in this dissertation describes the development of self-healing
coatings based on thiol-ene chemistry. The approach was to synthesize capsules with
thiol and ene compounds separately encapsulated. These ...
Free volume properties of semi-crystalline polymers
(Stellenbosch : University of Stellenbosch, 2011-03)
ENGLISH ABSTRACT: Positron annihilation lifetime spectroscopy (PALS) is well established as a novel method
currently available for the study of polymers at a molecular level because of its sensitivity
to the microstructural ...
Mechanistic studies of reversible addition-fragmentation chain transfer mediated polymerization
(Stellenbosch : Stellenbosch University, 2004-03)
ENGLISH ABSTRACT: To comply with the ever growing demands for materials with better properties and complex architectures,
polymer chemistry has resorted to the use of living free radical polymerization techniques. Despite ...
Localisation and quantification of chemical functional groups on pulp fibres
(Stellenbosch : University of Stellenbosch, 2010-12)
ENGLISH ABSTRACT: The distribution of different free chemical functional groups on wood and pulp
fibres was determined by means of atomic force microscopy (AFM) with
chemically modified tips. Because these functional ...
The structure-property relationships of polyolefins
(Stellenbosch : University of Stellenbosch, 2009-03)
Polypropylene is an extremely versatile material and has a broad spectrum of
applications due to the variations in properties which are possible with this material. The
variations in the properties of the material are ...