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Time dependent crystallinity of polybutene‐1
Author(s) -
Choi S. Y.,
Rakus J. P.,
O'Toole J. L.
Publication year - 1966
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.760060411
Subject(s) - polybutene , crystallinity , materials science , nucleation , phase (matter) , tacticity , composite material , chemical engineering , thermodynamics , polymer , organic chemistry , polymerization , chemistry , physics , engineering
Isotactic Polybutene‐1 can exist in 4 different crystalline phases of varying stability of which two are of greatest importance because they are involved in solidification from the melt initially, the melt cools into an unstable crystalline phase which gradually and spontaneously transforms into a stable, stronger, stiffer, more crystalline phase over a period of days. Rate of development of mechanical properties depends on crystallinity which depends on rate of phase change. However, optical properties develop in an unusual and irregualr way that is significantly affected by external factors, suxh as pressure, temperature, fillers nucleation and geometry.