İZOTAKTİK POLİPROPİLEN LİFLERİNİN YAPISAL KARAKTERİZASYONUNDA İNFRA-RED SPEKTROSKOPİ YÖNTEMİNİN KULLANIMI

Year 2011, Volume: 21 Issue: 2, 116 - 123, 01.12.2011

İsmail Karacan Hüseyin Benli

Abstract

İzotaktik polipropilen lifleri eriyikten çekme yöntemi ile 2500 m/dak ile 4250 m/dak arasındaki sarma hızlarında üretilmiştir. Üretim parametrelerinin kristalinite ve taktisite gibi yapısal parametrelerine etkisi infra-red ve yoğunluk ölçümleri ile araştırılmıştır. Numuneler ayrıca eriyik akış indisi ölçümleri ile karakterize edilmiştir. Infra-red eğri analizi hassas pik parametreleri ile sonuçlanmış olup elde edilen pik parametreleride taktisite ve kristalinite oranlarının hesaplanmasında kullanılmıştır. İzotaktisite ve ataktisite oranları 998, 841 ve 973 cm-1 IR piklerinin pik yükseklik oranlarının kullanımı ile elde edilmiştir (A998/A973, A841/A973). A841/A973 oranı ile elde edilen izotaktisite oranları A998/A973 oranından elde edilen değerlerden genel olarak daha fazla bulunmuştur. İzotaktisite oranları 3000 m/dak üretim hızından sonra artma eğilimi ataktisite oranları ise azalma eğilimi göstermektedir. Yoğunluk ve infra-red yöntemlerinden elde edilen kristalinite oranları karşılaştırılmıştır. Genel olarak, infra-red spektroskopi yönteminden elde edilen kristalinite oranlarıi yoğunluk esaslı kristalinite oranlarından daha fazla bulunmuştur

Keywords

İsotaktik polipropilen lifi, İnfra-red spektroskopi, Yoğunluk, Kristalinite, Taktisite

THE USE OF INFRARED-SPECTROSCOPY TECHNIQUE FOR THE STRUCTURAL CHARACTERIZATION OF ISOTACTIC POLYPROPYLENE FIBRES

Abstract

Isotactic polypropylene (iPP) fibres were produced by melt spinning method with take-up speeds between 2500 m/min and 4250 m/min. The effect of production parameters on structural parameters such as crystallinity and tacticity is investigated using infra-red spectroscopy together with density measurements. Samples were also characterized using Melt Flow Index (MFI) measurements. Curve fitting of IR spectra yielded accurate peak parameters which are in turn used in the evaluation of tacticity and fractional crystallinity values. Evaluation of isotacticity and atacticity fractions were performed using the absorbance ratios of the IR bands at 998, 841 and 973 cm-1 (A998/A973, A841/A973). Isotacticity fractions evaluated from A841/A973 are generally found to be higher than that evaluated from the ratio of A998/A973. Isotacticity fractions show an increasing trend after about the extrusion speed of 3000 m/min whereas atacticity fractions decrease accordingly. Crystallinity fractions obtained from density and infra-red spectroscopy methods are compared. In general, crystallinity fractions obtained from IR-spectroscopy are found to be slightly higher than the density based crystallinity fractions

Keywords

Isotactic polypropylene fibre, Infra-red spectroscopy, Density, Crystallinity, Tacticity

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