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Relationship between molecular orientation and draw ratio of polypropylene monofilaments
Author(s) -
Sheehan W. C.,
Wellman R. E.
Publication year - 1965
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1965.070091109
Subject(s) - polypropylene , birefringence , extension (predicate logic) , materials science , orientation (vector space) , aspect ratio (aeronautics) , composite material , thermodynamics , mathematics , physics , geometry , optics , computer science , programming language
The following empirical equation was derived for the relationship between molecular orientation α and permanent extension ratio λ of polypropylene monofilaments: α = 0.91(1 − 1/λ). The permanent extension ratio λ is the measured draw ratio adjusted to 1 when the orientation is zero. The standard deviation of the data points for 44 experimental filaments having different molecular weights, molecular weight distributions, and isotacticities about the line described by the equation was only 0.03. This equation is similar to a general empirical relationship between birefringence and draw ratio for several synthetic fibers derived by De Vries.