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Comparative study of the nucleation activity of third‐generation sorbitol‐based nucleating agents for isotactic polypropylene
Author(s) -
Marco C.,
Ellis G.,
Gómez M. A.,
Arribas J. M.
Publication year - 2002
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.10533
Subject(s) - tacticity , nucleation , sorbitol , differential scanning calorimetry , materials science , spherulite (polymer physics) , crystallite , crystallization , polymer , supercooling , polymer chemistry , polypropylene , chemical engineering , monoclinic crystal system , composite material , crystallography , chemistry , organic chemistry , thermodynamics , crystal structure , polymerization , physics , engineering , metallurgy
The nucleation activity of the sorbitol derivatives 1,2,3,4‐bis(3,4‐dimethylbenzylidene sorbitol) and methyldibenzylidene sorbitol are compared with that of talc, a conventional nucleating agent for the monoclinic crystalline phase of isotactic polypropylene. The thermal parameters associated with the dynamic crystallization process are studied as a function of the cooling rate by differential scanning calorimetry, and the nucleating efficiency is assessed by comparison with self‐nucleation, the highest values being observed for 1,2,3,4‐bis(3,4‐dimethylbenzylidene sorbitol) over the whole concentration range. The nature of the polymer crystals formed in the nucleated polymer was studied by X‐ray diffraction, and the data show an increase in a preferred orientation of the polymer crystallites with increasing concentration of nucleating agent. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 2440–2450, 2002