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Activity of a β‐nucleating agent for isotactic polypropylene and its influence on polymorphic transitions
Author(s) -
Marco C.,
Gómez M. A.,
Ellis G.,
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.10811
Subject(s) - tacticity , crystallization , differential scanning calorimetry , materials science , nucleation , recrystallization (geology) , polypropylene , polymer chemistry , chemical engineering , trigonal crystal system , crystallography , thermodynamics , composite material , chemistry , polymer , crystal structure , polymerization , engineering , paleontology , physics , biology
The influence of a nonpigmenting β‐nucleating additive in the crystallization of isotactic polypropylene (iPP) is investigated by differential scanning calorimetry and X‐ray diffraction. It is found that this additive induces the formation of a very high level of the trigonal modification of iPP. The crystallization and melting behavior of the nucleated systems are studied as a function of the cooling and heating rates and the control of the final temperature during the cooling process. The nucleating agent exerts an important effect on the crystallization temperatures and the polymorphic transitions of iPP, delaying the β–α recrystallization process through an increase in the stability of the trigonal crystals. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 531–539, 2002