TY  - JOUR
TT  - AN X-RAY DIFFRACTION STUDY FOR ISOTACTIC POLYPROPYLENE FIBRES PRODUCED WITH TAKE-UP SPEEDS OF 2500-4250 M/MIN
AU  - Karacan, İsmail
AU  - Benli, Hüseyin
PY  - 2011
DA  - July
Y2  - 2011
JF  - Textile and Apparel
PB  - Ege University
WT  - DergiPark
SN  - 1300-3356
SP  - 201
EP  - 209
VL  - 21
IS  - 3
KW  - İzotaktik polipropilen lifi
KW  - Diferansiyel taramalı kalorimetre
KW  - X-ışını difraksiyonu
KW  - Kristalinite
KW  - Krital boyutu
N2  - X-ray diffraction and differential scanning calorimetry (DSC) studies of isotactic polypropylene fibres, produced by melt spinning with take-up speeds of 2500-4250 m/min, showed the presence of polymorphism where the α-monoclinic and the smectic phases coexist together with an amorphous phase. X-ray diffraction was used for the determination of the unit cell dimensions, crystalline density, crystallinity and the crystallite size using an analysis of the equatorial traces whereas DSC was used for the evaluation of the melting enthalpies, melting temperatures and the crystallinity as a function of take-up speed. Crystallinity evaluated with the X-ray diffraction and the DSC techniques are compared and found that the X-ray crystallinity values are on average 8-14% higher than the DSC crystallinity values. Crystallite sizes are evaluated after curve fitting of X-ray diffraction traces for the (110), (040) and (130) reflections due to the α-monoclinic phase. The results show the crystallite size distribution of 116-136 Å, 108-118 Å and 89-97Å for the α-monoclinic phase reflections, whereas smectic phase reflection showed smaller crystallite size of 11-13 Å due to large intensity distribution of this peak.
CR  - 1. J. G. Poulakis, P. C. Varelidis, C. D. Papaspyrides, 1997, "Recycling of Polypropylene- Based Composites", Adv in Polym Techn 16, pp313–322.
UR  - https://dergipark.org.tr/en/pub/tekstilvekonfeksiyon/issue//261745
L1  - https://dergipark.org.tr/en/download/article-file/228249
ER  -