THE DYEABILITY AND PROPERTIES OF STRUCTURALLY MODIFIED POLYETHYLENE TEREPHTHALATE FIBRES
THE DYEABILITY AND PROPERTIES OF STRUCTURALLY MODIFIED POLYETHYLENE TEREPHTHALATE FIBRES
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Date
1979-02
Authors
EKPENYON, OROK EKPO
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Abstract
The effect of solvent - treatment on the dyeability
and mechanical properties of polyethylene terephthalate (PET)
has been studied. The mechanical properties of the dyed PET
fibres and some heat-set PET samples are also given. It was
observed that strongly interacting solvents such as N,N-dimethyl
formamide (DMF) and acetonitrile (CH.CN) improved the dyeability
of PET which had been treated with these solvents at 74
0 C for
15 minutes prior to dyeing with disperse dyes at 100 C. The
relative dye-uptake after DMF-treatment is 20 times greater than
after acetonitrile treatment. Pretreatment in both solvents
resulted in a lowering of tensile strength. Dyeing caused a
decrease in tensile strength, extensibility and initial modulus
at saturation but these properties improved when that initial
saturation interval was exceeded.
Solvent - treatment and heat-setting led to improvement
in the crystallinity of the PET fibres. Although the densities
of the various - treated PET fibres cannot be entirely relied
upon due to errors caused by the use of the carbon tetrachloride
- n-heptane mixture in the gradient column, the trends suggest
that density increases with increase in heat-setting temperature
Description
A Thesis submitted to the Ahmadu Bello University,
Zaria in partial fulfilment of the requirements for
the award of the degree of MASTER OF SCIENCE IN POLYMER
SCIENCE AND TECHNOLOGY.
Department of Chemistry,
FEBRUARY, 1979 Ahmadu Bello University,
Zaria, Nigeria.
Keywords
DYEABILITY,, STRUCTURALLY,, MODIFIED,, POLYETHYLENE,, TEREPHTHALATE,, FIBRES