Now showing items 1-5 of 5
Polypropylene/filler nanocomposites by melt compounding and in situ polymerization
(Stellenbosch : University of Stellenbosch, 2010-12)
ENGLISH ABSTRACT: The properties of polymer nanocomposites depend greatly on the chemistry of the polymer matrices, the nature of the nanofillers, and the way in which they are prepared. Understanding the synthesis–str ...
Imaging and quantifying the different crystalline structures of polypropylene with the atomic force microscope
(Stellenbosch : University of Stellenbosch, 2006-03)
Isotactic polypropylene (iPP) exists in four different crystalline phases: α-, β-, γ- and the mesomorphic (smectic) form. The α-phase is probably the most predominant form of iPP with a monoclinic unit cell, whereas the ...
The effect of molecular architecture on the properties of propylene impact copolymers
(Stellenbosch : University of Stellenbosch, 2010-03)
ENGLISH ABSTRACT: Impact polypropylene copolymers (IPPC) are important commercial materials, but their morphology and molecular architecture are not yet fully understood. In this study the focus was on selectively removing ...
The fractionation and characterisation of propylene-ethylene random copolymers
(Stellenbosch : University of Stellenbosch, 2005-12)
This study involves the fractionation and characterisation of three propyleneethylene random copolymers. The fractionation technique used in the study was temperature rising elution fractionation (TREF). The TREF fractions ...
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 ...