Title of article :
The role of nanoclay in the generation of poly(ethylene terephthalate) fibers with improved modulus and tenacity
Author/Authors :
Litchfield، نويسنده , , David W. and Baird، نويسنده , , Donald G.، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2008
Pages :
10
From page :
5027
To page :
5036
Abstract :
The effect of nanoclay concentration on the molecular orientation and drawability of poly(ethylene terephthalate) PET was examined using thermal and vibrational spectroscopic analysis. Although drawability at 83 °C in hot air increased by the addition of nanoclay, the maximum draw ratio was independent of nanoclay concentration. The average molecular orientation of the PET chain was found to mimic the trend in mechanical property improvements. Both Youngʹs modulus and tenacity (i.e. strength) showed the maximum improvement at a 1 wt% loading of clay, which was shown to coincide with the maximum amount of molecular orientation. Nanoclay was shown to intercalate with PET and enhanced amorphous orientation that led to modulus and strength improvements. However, at higher concentrations of nanoclay the presence of large agglomerates prevented efficient orientation to the fiber axis and acted as stress concentrators to aid in cavitation and failure during testing. Raman spectroscopy showed that the as-spun unfilled PET fibers possessed significantly more trans rotamer content of the ethylene glycol moiety than the nanocomposite fibers.
Keywords :
Fiber , nanoclay , Poly(ethylene terephthalate)
Journal title :
Polymer
Serial Year :
2008
Journal title :
Polymer
Record number :
1732237
Link To Document :
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