Kinetic mechanism of chain folding in polymer crystallization.
Phys Rev E Stat Nonlin Soft Matter Phys
; 90(3): 032601, 2014 Sep.
Article
de En
| MEDLINE
| ID: mdl-25314466
ABSTRACT
I develop a kinetic mechanism to explain chain folding in polymer crystallization which is based on the competition between the formation of stems, which is due to frequent occupations of trans states along the chains in the supercooled polymer melt, and the random coil structure of the polymer chains. Setting equal the average formation time of stems of length d(l) with the Rouse time of a piece of polymer of the same arc length d(l) yields a lower bound for the thickness of stems and bundles. The estimated lamellar thickness is inversely proportional to the supercooling. The present approach emphasizes the importance of repulsive interactions in polymer crystallization, which are expected to be responsible for the logarithmic lamellar thickening and the increase of lamellar thickness with pressure. An expression for the growth rate for formation and deposition of stems is derived by considering the growth as a dynamic multistage process.
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Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Polymères
/
Conformation moléculaire
Langue:
En
Journal:
Phys Rev E Stat Nonlin Soft Matter Phys
Sujet du journal:
BIOFISICA
/
FISIOLOGIA
Année:
2014
Type de document:
Article
Pays d'affiliation:
Allemagne