Determination of the intrinsic birefringence of polymeric fibres

A. A. Hamza, T. Z.N. Sokkar, K. A. El-Farahaty, H. M. El-Dessouky

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


The intrinsic (maximum observable) birefringence Δnmax at complete orientation of the assembly is determined for polypropylene (PP) and polyethylene (PE) fibres. This is quantified by determination of the molecular orientation parameter of the fibre at a given value of the draw ratio using mathematical expressions. Also, a new approach is suggested for determining the unknown initial value of the draw ratio for given fibres. The double-beam polarizing (Pluta) microscope with a drawing device attached is used for this purpose. Illustrations using microinterferograms, graphs and tables are shown.
Original languageEnglish
Pages (from-to)203-208
Number of pages6
JournalPolymer Testing
Issue number2
Early online date17 Sep 2003
Publication statusPublished - Apr 2004
Externally publishedYes


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