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A basic study of orientation in poly(ethylene terephthalate) stretch‐blow molded bottles
Author(s) -
Cakmak Mukerrem,
Spruiell Joseph E.,
White James L.
Publication year - 1984
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760241804
Subject(s) - materials science , bottle , composite material , poly ethylene , blow molding , polymer , plane (geometry) , surface (topology) , ethylene , geometry , organic chemistry , chemistry , mold , mathematics , catalysis
A series of stretch‐blow molded poly(ethylene terephthalate) bottles were investigated using measurements of birefringences (in plane and out of plane) and wide angle x‐ray diffraction (WAXS) pole figures. Both bottles prepared in our laboratories and commercial bottles were investigated. Birefringences Δ n 13 and Δ n 23 of inside and outside surfaces of bottles were determined as a function of position along the length of the bottle (1‐bottle axis, 2‐hoop direction, 3‐thickness direction). The Δ n 13 , Δ n 23 for the inside surface of the bottles were found to be greater than those for the outside surface indicating heterogeneity through the thickness of the bottles. The WAXS studies indicate that the benzene rings in the polymer align parallel to the bottle surface. The chain axis in crystalline regions exhibit orientations close to equal biaxial orientation. Both Δ n 13 and Δ n 23 increased with inflation pressure.