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Nonisothermal Crystallization Behaviors of Structure-Modified Polyamides (Nylon 6s)

[Image: see text] 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 crystalli...

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Detalles Bibliográficos
Autores principales: Choi, Junsok, Shin, Taejoon, Song, Kwanwoo, Seo, Youngwook P., Seo, Yongsok
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7676331/
https://www.ncbi.nlm.nih.gov/pubmed/33225163
http://dx.doi.org/10.1021/acsomega.0c04082
Descripción
Sumario:[Image: see text] 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.