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Formation and behaviour of low‐temperature melting peak of quenched and annealed isotactic polypropylene
Author(s) -
Dudić Dus̆ke,
Kostoski Dus̆an,
Djoković Vladimir,
Dramićanin Miroslav D
Publication year - 2002
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.803
Subject(s) - tacticity , materials science , annealing (glass) , differential scanning calorimetry , polypropylene , quenching (fluorescence) , crystallization , amorphous solid , melting point , polymer , melting temperature , atmospheric temperature range , composite material , polymer chemistry , thermodynamics , crystallography , polymerization , fluorescence , chemistry , physics , quantum mechanics
The process of low‐melting point (LMP) α‐phase formation in a quenched and annealed isotactic polypropylene (iPP) was studied by means of differential scanning calorimetry. The influence of preparation conditions (quenching and annealing temperatures, annealing times and sample thickness), together with the measurement parameters (heating and cooling rates), on the iPP melting behaviour are analysed. The results reveal a constant yield of LMP crystals over a wide range of quenching temperatures. This study also suggests that the LMP α‐crystals originate from the crystallization of polymer portions, which are somewhere between the amorphous and the smectic phase on the macromolecular scale of order. © 2001 Society of Chemical Industry