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Fractionated crystallization in blends of functionalized poly(tetrafluoroethylene) and polyamide
Author(s) -
Häußler Liane,
Pompe Gisela,
Lehmann Dieter,
Lappan Uwe
Publication year - 2001
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200102)164:1<411::aid-masy411>3.0.co;2-h
Subject(s) - tetrafluoroethylene , materials science , crystallization , polyamide , compatibilization , reactive extrusion , extrusion , dispersity , chemical engineering , polymer blend , polymer chemistry , polypropylene , crystallinity , composite material , polymer , copolymer , engineering
Blends of poly(tetrafluoroethylene)/polyamide (PTFE/PA) were prepared to combine the good processing properties of PA with the excellent sliding properties of PTFE. For the compatibilizing of the immiscible components the chemical reaction of functional groups of modified PTFE (micro powder produced by electron irradiation in air) and polar PA during a reactive extrusion process was used. The parameter influencing the efficiency of the in‐situ reaction between both components were varied. The crystallization and melting behaviour of the different blends was investigated by DSC. In dependence on the degree of compatibilization the phenomenon of fractionated crystallization of the dispersed PTFE component was observed. In this way a qualitative characterization of the dispersity of PTFE in dependence on the functionality of the components and the processing conditions is possible, and therefore an estimation of the efficiency of the in‐situ reaction.