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Comparative study on the molecular structure of ethylene/1-octene, ethylene/1-heptene and ethylene/1-pentene copolymers using advanced analytical methods
(Stellenbosch : Stellenbosch University, 2015-04)
ENGLISH ABSTRACT: Linear low density polyethylene (LLDPE), one of the fastest growing types of polyethylene, is made from the copolymerisation of ethylene and higher 1-olefin comonomers. 1-octene is the comonomer of choice ...
Multidimensional separation of complex polymers according to microstructure
(Stellenbosch : Stellenbosch University, 2014-04)
ENGLISH ABSTRACT: Complex polymer systems have multiple distributions with regard to molecular parameters
such as molar mass, functionality, chemical composition, molecular architecture and
microstructure. These distributions ...
Advanced analytical methods for the analysis of complex polymers prepared by RAFT and RITP
(Stellenbosch : Stellenbosch University, 2015-04)
ENGLISH ABSTRACT: Synthetic polymers are complex compounds that have multiple distributions with
regard to molar mass, chemical composition, functionality and molecular architecture.
Therefore, the molecular complexity ...
Novel barrier coatings based on nanoclay-polymer composites
(Stellenbosch : Stellenbosch University, 2015-04)
ENGLISH ABSTRACT: The investigation of the barrier properties of highly filled polymer-clay hybrid latex films is described. Montmorillonite (MMT) clay contents ranging from 10–30 wt.% were effectively incorporated into ...
Thermal field-flow fractionation (Thermal FFF) and asymmetrical flow field-flow fractionation (AF4) as new tools for the analysis of block copolymers and their respective homopolymers
(Stellenbosch : Stellenbosch University, 2014-12)
ENGLISH ABSTRACT: Polystyrene-block-poly(ethylene oxide) (PS-b-PEO) copolymers contain a hydrophilic PEO block and a hydrophobic PS block. PS and PEO have different affinities for most organic solvents and as a result, the ...
NMR studies on the mechanism of iodine mediated polymerisation
(Stellenbosch : Stellenbosch University, 2011-12)
ENGLISH ABSTRACT: In reverse iodine transfer polymerisation (RITP), chain transfer agents (CTAs) are
generated in situ from the reaction between 2,2’-azobis(isobutyronitrile) (AIBN) and
molecular iodine. This stage of ...
Highly filled water based polymer/clay hybrid latexes
(Stellenbosch : Stellenbosch University, 2012-12)
ENGLISH ABSTRACT: The use of co-sonication (ad-miniemulsion) polymerisation for the preparation of highly filled polymer/clay hybrid latexes is described. Laponite (Lap) content levels in the range of 10–50 wt% were ...
Surface modified cross-linked poly(vinyl alcohol)/poly(vinyl pivalate) suspension particles
(Stellenbosch : University of Stellenbosch, 2010-12)
ENGLISH ABSTRACT: In papermaking, fillers and additives are used to enhance paper properties. In this study spherical
modified poly(vinyl alcohol) (PVA) particles were prepared for use as fillers. In order to determine
the ...
Multidimensional fractionation of wood-based tannins
(Stellenbosch : University of Stellenbosch, 2011-03)
ENGLISH ABSTRACT: High molar mass tannin extracts are complex mixtures which are distributed in both molar mass and chemical composition. Condensed tannins from quebracho and mimosa and hydrolysable tannins of tara, chestnut ...
Polymer-clay nanocomposites prepared by RAFT-supported grafting
(Stellenbosch : Stellenbosch University, 2012-12)
ENGLISH ABSTRACT: In materials chemistry, surface-initiated reversible deactivation radical polymerisation (SI-RDRP) has emerged as one of the most versatile routes to synthesising inorganic/organic hybrid materials ...