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Effects of CO 2 on crystallization kinetics of polypropylene
Author(s) -
Takada Mitsuko,
Tanigaki Masataka,
Ohshima Masahiro
Publication year - 2001
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.10890
Subject(s) - crystallization , materials science , polypropylene , crystallinity , nucleation , differential scanning calorimetry , crystallization of polymers , kinetics , isothermal process , thermodynamics , atmospheric pressure , polymer , polymer chemistry , chemical engineering , analytical chemistry (journal) , composite material , chemistry , organic chemistry , oceanography , physics , quantum mechanics , engineering , geology
Abstract When CO 2 dissolves into a polypropylene (PP), its crystallization kinetics changes These changes were studied, in the expectation that the information would reflect on the behavior of other semicrystalline polyolefins. The isothermal crystallizatior rate of the PP‐CO 2 solutions was measured using a high‐pressure differential scanning calorimeter (DSC), which performed calorlmetric measurements while keeping the polymer in contact with pressurized CO 2 . Although the measured crystallizatior rate followed the Avrami equation, the value of the crystallization kinetic constant was different from that measured for PP crystallized in air under atmospheric pressure. The dissolved CO 2 decreased the overall crystallization rate of PP within the nucleation dominated temperature region. This suggests that the dissolved CO 2 decreases the melting and the glass transition temperatures and prevents formation of critical size nuclei.