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β‐relaxation of drawn isotactic polypropylene in terms of a simplified two phase model
Author(s) -
Jawad S. A.,
AlhajMohammad M. H.
Publication year - 1994
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.1994.210350413
Subject(s) - tacticity , relaxation (psychology) , materials science , amorphous solid , glass transition , phase (matter) , thermodynamics , series (stratigraphy) , polypropylene , polymer chemistry , composite material , polymer , crystallography , chemistry , physics , polymerization , organic chemistry , psychology , social psychology , paleontology , biology
β‐Relaxation in die‐drawn isotactic polypropylene (i‐pp) is associated with a glass transition temperature and depends on the mobility of the molecules in the amorphous regions. A simplified two phase model was employed to explain the decrease in the intensity of the β‐process peak upon drawing. The model predicts that the decrease in the loss factor (tan δ) upon drawing is associated with a change in continuity from a series to a parallel situation.