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Equilibrium disperse‐dye sorption by isotactic polypropylene films of varied thermal histories
Author(s) -
Yonetake Koichiro,
Masuko Toru,
Shimanuki Tomoyuki,
Karasawa Mikio
Publication year - 1983
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.1983.070281005
Subject(s) - crystallinity , sorption , amorphous solid , tacticity , materials science , polymer chemistry , isothermal process , side chain , polymer , annealing (glass) , chemical engineering , polypropylene , crystallography , composite material , chemistry , thermodynamics , adsorption , polymerization , physics , engineering
Spherulitic polypropylene (PP) films prepared by a melt‐quenched process and then exposed to isothermal annealing treatments at various temperatures ranging from 120°C to 155°C have been dyed at 80°C with C.I. Disperse Yellow 7(Y‐7) or p ‐aminoazobenzene. Different PP films as crystallized isothermally in the range of 60°C to 155°C have also been dyed with the same dyes. The equilibrium dye sorption ( M o ) obtained for these films increased slightly with an increase in polymer volume crystallinity ( C u ). Using fine structural data of these films, the change in M o were analyzed in terms of the mosaic‐block structural model; e.g., the values of M o were divided into sorption by the amorphous end region ( M e ) located between lamella surfaces and sorption by the amorphous side region ( M s ) located between crystalline cores parallel to the molecular chain axis. The value of M s increased with increasing C v in both cases of the dyeing systems, while the value of M e decreased monotonically in an opposite manner. The amorphous chains in the side region seem to have a strong affinity to a long rodlike dye molecule of Y‐7; this feature is considered to be associated with the extended chain conformation of the side region which originates from distorted lattice chains.