The Thermogravimetric,Microscopic and Mechanical Analyses of PBT and PET yarns(3)

Antibacterial properties have become important factors for some textile application areas (e.g. sanitary and medical textiles) too. So, incorporation of antibacterial agents like silver,quaternary ammonium compounds, chitosan etc is broadly studied in the literature. In general, the antibacterial agent penetrates the fiber like a dispersion dyestuff and is supported in it by some selected types of carrier. In another method, the bactericide is added during grafting or solid-face copolycondensation of fibres (8). Briefly, polyester can be modified for a number of reasons and by several different strategies such as to include co-monomers in the polymerization process or additives to the polymer melt before extrusion, topical additive treatments after the fiber is formed and physical/non-additive chemical modifications (1).

Fibers can also be modified via changing fiber cross-sectional shapes. Surface lobes can break up smoothness and reduce glitter, and triangular or 'T' shapes can generate subtle sheen effects to fabrics and yarns. In the literature, it has been mentioned that there are various cross-sectional shapes used to provide visual and tactile effects that are not possible with natural fibres. The fiber cross-section can be modified by changing the shape of the spinneret holes; and while a round section is usual, a myriad of other shapes have been produced, the more common of which would be trilobal or pentalobal In this study, PBT yarn, three PET based modified polyester yarns (flameretardant,UV protective and antibacterial) and an unmodified PET based yarn were used. Some properties and surface characteristics of these yarns were investigated. The thermal behavior of treated samples was also discussed.

2. MATERIAL AND METHOD
2.1 Materials
The semi-dull modified polyester yarns were supplied from KORTEKS that is an important polyester yarn producer in Turkey. The information about the yarns is given in Table 1.

Writen by Buket ARIK1, Ebru BOZACI1, Asli DEMIR2, Esen ÖZDOGAN1