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Conformation of single polymer molecule in a slot coating flow

Authors
Lee, Jeong YongRyu, Bo KyungLee, Joo SungJung, Hyun WookHyun, Jae Chun
Issue Date
Jun-2008
Publisher
KOREAN SOC RHEOLOGY
Keywords
Brownian dynamics; computational fluid dynamics; slot coating; conformation; flow strength; flow type parameter; single polymer chain
Citation
KOREA-AUSTRALIA RHEOLOGY JOURNAL, v.20, no.2, pp.89 - 94
Indexed
SCIE
SCOPUS
KCI
OTHER
Journal Title
KOREA-AUSTRALIA RHEOLOGY JOURNAL
Volume
20
Number
2
Start Page
89
End Page
94
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/123403
ISSN
1226-119X
Abstract
To satisfy good mechanical and optical properties of polymer-coated film products, it will be indispensable to elucidate the molecular orientation of polymer chains within coating liquids in coating flows. Using hybridized numerical method between computational fluid dynamics (CFD) and Brownian dynamics (BD) simulations can provide the useful information for the better quality control of coated films. Flexible polymer chains, e.g., lambda-DNA molecules here, change their conformation according to the flow strength and the flow type. The molecular conformation within the coated film on the web or substrate is quite different, because the polymer chains experience the complicated flow strength and flow types in flow field. Especially in the slot coating flow, these chains are more extended by the extension-like flow field generated in the free surface curvature just beyond the downstream die region. Also, the polymer chain extension beneath the free surface can be affected by the die geometry, e.g., the coating gap, changing flow field.
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