An X-ray diffraction study for isotactic polypropylene fibres produced with take-up speeds of 2500-4250 m/mın

Eriyikten çekme yöntemi ile 2500-4250 m/dak. arası sarma hızlarında üretimi yapılan izotaktik polipropilen liflerinin X-ışını difraksiyonu ve diferansiyel taramalı kalorimetre çalışmalarında α-monoklinik ve smektik fazlarının aynı zamanda amorf faz ile beraber eş zamanlı olarak mevcut oluğu gösterilmiştir. X-ışını difraksiyonu birim hücre parametreleri, kristal yoğunluğu, kristalinite ve kristalit boyutlarının hesaplanmasında, öbür taraftan DSC ise erime entalpileri, erime sıcaklıkları ve kristalinite değerlerinin sarma hızlarına bağlı olarak elde edilmesinde kullanılmışır. X-ışını difraksiyonu ve DSC ile elde edilen kristanilite değerleri karşılaştırılmış ve X-ışını ile elde edilen kristalinite değerlerinin DSC ile elde edilen değerlerden ortalama %8-14 daha fazla olduğu bulunmuştur. α-monoklinik faza ait (110), (040) ve (130) yansımalarının kristlit boyutları X-ışını difraksiyonu grafiğinin eğri analizinden sonra hesaplanmıştır. α-monoklinik yansımalaın kristalit boyut dağılımı değerleri 116-136 Å (110), 108-118 Å (040) and 89-97Å (130) olarak bulunmuştur, öbür taraftan smektik faza ait yansımanın kristalit boyutu daha küçük olup bu pikin daha geniş şiddet dağılımından dolayı 11-13Å arasında gerçekleşmiştir.

2500-4250 m/dak. sarma hızlarında üretilen izotaktik polipropilen lifleri için bır x-ışını difraksiyonu çalışması

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.

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