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Memory effects in polymers. IV. Processing history vs. crystallization rate—effect of polymer structure
Author(s) -
Khanna Y. P.,
Kumar R.,
Reimschuessel A. C.
Publication year - 1988
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.760282407
Subject(s) - materials science , crystallization , polymer , nylon 6 , polyethylene , polyethylene terephthalate , nylon 66 , polymer chemistry , copolymer , extrusion , composite material , chemical engineering , polyamide , engineering
Our earlier work on this series has shown that the processing history, e.g., melt‐extrusion, freeze‐grinding, or solution precipitation of virgin nylon 6 leads to a marked increase in the crystallization rate. Similar studies have now been extended to several other polymers. Results indicate that the processing history effects on the crystallization rate are most pronounced for polymers with high intermolecular forces, e.g. nylon 6, nylon 66, nylon 6/66, nylon 11, and nylon 12. Interestingly, polymers of intermediate polarity, e.g., polyethylene terephthalate (PET) and chlorotrifluoroethylene (CTFE)/vinylidene fluoride (VDF) copolymer (96/4, Aclar®) also reveal similar effects although to a much lesser extent. On the other hand, non‐polar polymers, e.g. polyethylene, are not influenced in terms of crystallization behavior by the processing history.