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Frictional surface temperature determination of high‐temperature‐resistant semicrystalline polymers by using their double melting features
Author(s) -
Zhang Ming Qiu,
Song Le,
Zeng Han Min,
Friedrich Klaus,
KargerKocsis József
Publication year - 1997
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/(sici)1097-4628(19970131)63:5<589::aid-app6>3.0.co;2-q
Subject(s) - differential scanning calorimetry , crystallinity , materials science , endothermic process , annealing (glass) , glass transition , polymer , amorphous solid , crystallization , melting point , melting temperature , composite material , thermal analysis , polymer chemistry , thermodynamics , thermal , chemistry , crystallography , physics , adsorption
Most semicrystalline polymers exhibit multiple melting peaks in the course of normal differential scanning calorimetry (DSC) measurements. When their amorphous versions are annealed above the glass transition temperatures, the lower endothermic temperatures ( T m 1 ) appearing on the subsequent DSC heating traces are highly dependent on the annealing temperature ( T a ). In consideration of the fact that temperature is the critical environmental factor controlling polymer crystallization, thermal history experienced by the material during annealing in the DSC cell is basically equivalent to that under frictional heating, and the surface temperature prevailing under sliding wear can be estimated from DSC scans taken on the worn surface. In this case, the lower melting peak temperature observed (which can be correlated with the annealing temperature) serves as an indicator for the flash temperature. In addition, this thermoanalytical method can also provide information about microstructural changes due to wearing. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 589–593, 1997