Open AccessNonisothermal Crystallization Behaviors of Structure-Modified Polyamides (Nylon 6s)
Author(s) -
Junsok Choi,
Taejoon Shin,
Kwanwoo Song,
Youngwook P. Seo,
Yongsok Seo
Publication year - 2020
Publication title -
acs omega
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.0c04082
Subject(s) - crystallization , nucleation , differential scanning calorimetry , optical microscope , materials science , polyamide , avrami equation , kinetics , polarized light microscopy , branching (polymer chemistry) , crystallization of polymers , thermodynamics , exponent , crystallography , polymer chemistry , chemical engineering , scanning electron microscope , chemistry , composite material , optics , linguistics , philosophy , physics , quantum mechanics , engineering
The morphological development and thermal properties of different polyamides with long-chain branches without forming a network structure were characterized by differential scanning calorimetry, polarized optical microscopy, and nonisothermal crystallization kinetics. The crystallization characteristics were analyzed using the nonisothermal kinetic equation proposed by Seo. Polarized optical microscopy and the Avrami exponent show the effect of the structural changes on the molecular ordering during the crystallization and early morphological development. The Avrami exponent, n , determined from the analysis of the nonisothermal crystallization kinetics, indicates a reduced heterogeneous nucleation for the modified polyamides. Structural changes (branching) of the polyamides impede crystallization, as indicated by the shift of the crystallization peaks to lower temperatures.
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