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Morphology of quenched polypropylene
Author(s) -
Gezovich D. M.,
Geil P. H.
Publication year - 1968
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.760080305
Subject(s) - materials science , monoclinic crystal system , polypropylene , morphology (biology) , quenching (fluorescence) , hexagonal crystal system , composite material , chemical engineering , crystallography , crystal structure , optics , chemistry , physics , biology , fluorescence , genetics , engineering
The morphology of the quenched form of polypropylene was investigated. Thin films of the quenched form consist of small ball‐like structures which we suggest are defective hexagonal crystals. In thicker films they aggregate to form spherulites with no observable fine structure. Quenching of thin films of molten polypropylene to a temperature below 0°C results in the formation of numerous, isolated monoclinic spherulites with a better defined morphology than the smectic spherulites obtained by quenching above 0°C. This result suggests that the films (quenched below 0°C) were quenched to the glass and subsequently crystallized to the monoclinic form upon heating to room temperature.