On the physical behavior of isotactic polypropylene fibers extruded at different draw-down ratios. i. optical properties and cold-drawing

Hassan M. El-Dessouky, Mohammad R. Mahmoudi, Carl A. Lawrence, Khaled M. Yassien, Taha Z.N. Sokkar, Ahmed A. Hamza

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

As spun polypropylene fibers (iPP) with different drawdown ratios (DDR) were produced at increasing take-up speeds ranging from 200 m/min to 1000 min. Two interferometric techniques (Pluta and Interphako microscopes) were used to investigate the refractive indices and birefringence of the spun fibers. The use of the Interphako microscope enabled all the fiber diameters to be studied and avoid image overlap (Sokkar et al., Opt. Lasers Eng., 45, 431 (2007)). Previously reported software (Sokkar et al., Opt. Lasers Eng., 45, 431 (2007), Hamza et al., J. Appl. Polym. Sci., 77, 3099 (2000)) was used to determine the refractive index profiles for PP fibers at different DDR. An optothermomechanical (OTM) (Hamza et al., J. Appl. Polym. Sci., 95, 647 (2005)). device attached to the Pluta microscope was used to examine the drawability of the melt-spun iPP fibers by cold-drawing. The work is concerned with the importance of the difference between physical effects of DDR and DR. The influence of DDR on the relation between optical properties and solid state draw ratio (DR) was determined. The fibers spun at low DDR give high-maximum draw ratio (DRmax) and higher birefringence (Dn) than those of higher DDR. Total attenuation ratio (TAR) of the melt-spun iPP fibers was defined and calculated. The minimum (theoretical) birefringence (Dnmin) and maximum (measurable) birefringence (Dnmax) of iPP fibers were determined. POLYM. ENG. SCI., 49:2116-2124, 2009.
Original languageEnglish
Pages (from-to)2116-2124
Number of pages9
JournalPolymer Engineering and Science
Volume49
Issue number11
Early online date17 Jul 2009
DOIs
Publication statusPublished - Nov 2009
Externally publishedYes

Fingerprint Dive into the research topics of 'On the physical behavior of isotactic polypropylene fibers extruded at different draw-down ratios. i. optical properties and cold-drawing'. Together they form a unique fingerprint.

  • Cite this

    El-Dessouky, H. M., Mahmoudi, M. R., Lawrence, C. A., Yassien, K. M., Sokkar, T. Z. N., & Hamza, A. A. (2009). On the physical behavior of isotactic polypropylene fibers extruded at different draw-down ratios. i. optical properties and cold-drawing. Polymer Engineering and Science, 49(11), 2116-2124. https://doi.org/10.1002/pen.21449