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Cold drawing of polyethylene terephthalate/polyethylene films
Author(s) -
Berger W.,
Ludwig U.,
Hauffe W.,
Karasz F. E.
Publication year - 1987
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.1987.070340305
Subject(s) - polyethylene terephthalate , materials science , polyethylene , composite material , void (composites) , polymer , scanning electron microscope , electron microscope , polymer chemistry , optics , physics
Films made from a 77/23 weight percent polyethylene terephthalate/polyethylene blend were stretched using an Instron apparatus. The structures of the samples were examined by methods which included ion beam etching and electron microscopy. The drawn samples exhibited a metallically lustrous and highly reflective surface up to a draw temperature, T R , of 70°C and a draw ratio of about 5. Under certain conditions the change in structure caused by the stretching resulted in the formation of a highly uniform fibril‐void structure. The voids are up to 3 μm in width and 160 μm in length and are formed primarily as a result of aggregation and then separation of the microfibrils of the individual polymer components.