Studies on orientation phenomena by fiber formation from polymer melts. Part II. Theoretical considerations

✍ Scribed by Andrzej Ziabicki

• Publisher: John Wiley and Sons
• Year: 1959
• Tongue: English
• Weight: 566 KB
• Volume: 2
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1959.070020404

✦ Synopsis

Abstract

The mechanism for orientation of macromolecules through the melt‐spinning of synthetic fibers is analogous to that in polymer solutions flowing in capillaries or in a Couette apparatus. The differences between the two processes, with regard to the velocity field, molecular state, and time dependencies, have been discussed and the differential equations derived to describe the orientation of two extreme molecular models. The coefficients of orientation for fibers consisting of rigid particles (model I) and flexible, coiled chains (model II) have been defined. The specific conditions occuring in fiber‐spinning experiments have been shown, as well as the possibility of applying such experiments to the study of the behavior of macromolecules in the molten state.