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Characterization of polyethylene terephthalate films drawn in hot water
Author(s) -
Zumailan A.,
Dargent E.,
Saiter J. M.
Publication year - 2004
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.20021
Subject(s) - differential scanning calorimetry , materials science , crystallinity , polyethylene terephthalate , amorphous solid , crystallization , glass transition , phase (matter) , chemical engineering , phase transition , composite material , polyethylene , molecule , polymer chemistry , polymer , crystallography , organic chemistry , thermodynamics , chemistry , physics , engineering
Sorbed water molecules in PET (around 1% in mass) lead to classic plasticizing effects, basically evidenced by a decrease of the glass transition ( T g ) and of the cold crystallisation ( T c ) temperatures with increasing water content. During drawing of dry PET film and depending on the draw ratio, the initial amorphous phase is oriented at first, then a strain‐induced crystallisation appears. This work deals with the conjugate effects of drawing and water sorption in PET films drawn in hot water. Differential scanning calorimetry and birefringence measurements shown that drawing performed in hot water leads to modifications of T g and T c without modification of the degree of crystallinity. Moreover, the formation of water clusters is observed when the strain‐induced crystalline phase occurs.