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Melting and recrystallization of PA‐6/PA‐66 blends
Author(s) -
Rybnikár̆ Frantis̆ek,
Geil P. H.
Publication year - 1993
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.1993.070490706
Subject(s) - recrystallization (geology) , exothermic reaction , annealing (glass) , materials science , morphology (biology) , polyamide , polymer chemistry , differential scanning calorimetry , melting temperature , polymer blend , chemical engineering , copolymer , composite material , polymer , chemistry , thermodynamics , organic chemistry , paleontology , genetics , physics , engineering , biology
The morphology of a number of polyamides (PA)—namely, PA‐66, PA‐6/PA‐66 blends, and PA‐6/PA‐66 copolymers—prepared from HCOOH solution and from the melt has been examined as well as the effect of annealing. In the blends, the PA‐6 crystallizes within the PA‐66 spherulites. When prepared from HCOOH solution at 25°C, the PA‐66‐containing samples show a large exothermic peak before the sample melting peak is observed by DSC. This exothermic peak, which cannot be fully explained by previously known observations, PA recrystallization, and/or the morphology changes we describe here, is not seen for PA‐6 or for PA‐66 prepared from HCOOH solution at 100°C. © 1993 John Wiley & Sons, Inc.