Polyester Fiber
Polyesters are those fibers containing at least 85% of a polymeric ester
of a substituted aromatic carboxylic acid including but not restricted
to terephthalic acid and f-hydroxybenzoic acid.
Polyesters are those fibers containing at least 85% of a polymeric ester
of a substituted aromatic carboxylic acid including but not restricted
to terephthalic acid and f-hydroxybenzoic acid. The major polyester in
commerce is polyethylene terephthalate, an ester formed by step-growth
polymerization of terephthalic acid and the diethylene glycol.
POLYETHYLENE TEREPHTHALATE
Polyethylene terephthalate polyester is the leading man-made fiber in
production volume and owes its popularity to its versatility alone or as
a blended fiber in textile structures. When the term “polyester” is
used, it refers to this generic type. It is used extensively in woven
and knitted apparel, home furnishings, and industrial applications.
Modification of the molecular structure of the fiber through texturizing
and or chemical finishing extends its usefulness in various
applications.
POLY-l,4-CYCLOHEXYLENEDIMETHYLENE TEREPHTHALATE
The cyclo hexylene group within this fiber provides additional rigidity
to the molecular chains, but the packing of adjacent polymer chains may
be more difficult due to the complex structure, As a result, the fiber
has a lower tenacity than polyethylene terephthalate.
Poly-p-ethyleneoxybenzoate
The properties of this fiber were not sufficiently different from other
polyesters to achieve reasonable market penetration, and the fiber has been
discontinued.
polyesters to achieve reasonable market penetration, and the fiber has been
discontinued.
Modified Terephthalate Polyesters
Poor dyeabi1ity and the moderate flammabi1ity of polyester have resulted
in the formulation of modified terephthalate esters to improve the
dyeability and the flame retardant properties of the fiber.
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