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Thermal behavior of transparent poly(etheretherketone)(PEEK) film
Author(s) -
Gupta Hemant,
Salovey R.
Publication year - 1990
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.760300805
Subject(s) - peek , materials science , crystallization , differential scanning calorimetry , enthalpy , enthalpy of fusion , annealing (glass) , fusion , glass transition , recrystallization (geology) , composite material , melting point , chemical engineering , thermodynamics , polymer , paleontology , linguistics , philosophy , physics , engineering , biology
The thermal behavior of poly(etheretherketone)(PEEK) film heated in an open differential scanning calorimetry (DSC) pan at 20°C/min is distorted by relaxation of the strained film. PEEK film in a closed pan or quenched PEEK in open or closed pans shows a glass‐transition temperature ( T g ) around 144°C, cold crystallization (∼22 J/g) at 177°C, melt‐temperature ( T m ) peaking at 335–340°C, with an enthalpy of fusion of 32–34 J/g, and recrystallization on cooling at 285°C, with a crystallization exotherm of about 40 J/g. The enthalpy of fusion decreases with increasing heating rate from 2–100°C/min and approaches the enthalpy of cold crystallization. With increasing heating rate, further crystallization of PEEK during the DSC scan is suppressed. With increasing cooling rate, PEEK melt crystallizes at larger supercoolings to a lesser extent. Crystallization on cooling the melt was more complete than cold crystallization and annealing on heating.