Zobrazeno 1 - 10 of 40 pro vyhledávání: '"Youngdon Kwon"'
1
Supercritical bifurcation to periodic melt fracture as the 1st transition to 2D elastic flow instability
Autor: Youngdon Kwon
Publikováno v: Korea-Australia Rheology Journal. 32:309-317
This study, employing a numerical approximation, computationally describes 2D melt fracture as elastic instability in the flow along and outside a straight channel. In the preceding research (Kwon, 2018, Numerical modeling of two-dimensional melt fra
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::70767963c72e3beb19605d0a9431cc78
https://doi.org/10.1007/s13367-020-0029-y
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3
Effect of Head-to-Head Association/Dissociation on Viscoelastic and Dielectric Relaxation of Entangled Linear Polyisoprene: An Experimental Test
Autor: Youngdon Kwon, Tadashi Inoue, Yumi Matsumiya, Hiroshi Watanabe, Osamu Urakawa
Publikováno v: Macromolecules. 53:1070-1083
For linear high-cis polyisoprene having a monofunctionally associative carboxyl group at the chain head (PI30-COOH; M = 30.5 × 103), linear viscoelastic and dielectric behavior was examined in its ...
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b1bbdf8eb0e4a1eaaf21891cee3df5c5
https://doi.org/10.1021/acs.macromol.9b02399
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4
Dielectric Relaxation of Type-A Chains Undergoing Head-to-Tail Association/Dissociation: Difference from Head-to-Head Case and Correlation with Viscoelastic Relaxation
Autor: Youngdon Kwon, Yumi Matsumiya, Hiroshi Watanabe
Publikováno v: Macromolecules. 52:8484-8502
Dielectric relaxation of type-A chains reflects global motion of the chains but is also affected by relative alignment of the dipoles along the chain backbone, namely, by the dipole inversion. Head-to-head association of type-A unimers gives a symmet
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::be4f60adc824140360cd603fa21bf567
https://doi.org/10.1021/acs.macromol.9b01710
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6
Numerical modelling of two-dimensional melt fracture instability in viscoelastic flow
Autor: Youngdon Kwon
Publikováno v: Journal of Fluid Mechanics. 855:595-615
Computationally modelling the two-dimensional (2-D) Poiseuille flow along and outside a straight channel with a differential viscoelastic constitutive equation, we demonstrate unstable dynamics involving bifurcations from steady flow to periodic melt
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::97caa327bb8d5288bad0eca81bdfac40
https://doi.org/10.1017/jfm.2018.659
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7
Viscoelastic and Dielectric Relaxation of Reptating Type-A Chains Affected by Reversible Head-to-Head Association and Dissociation
Autor: Hiroshi Watanabe, Youngdon Kwon, Yumi Matsumiya
Publikováno v: Macromolecules. 51:6476-6496
For entangled linear polymer having type A dipoles and undergoing head-to-head association and dissociation reaction, viscoelastic and dielectric behavior is theoretically analyzed on the basis of the reptation dynamics combined with the reaction kin
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::67ea879045630a749b1551b839072252
https://doi.org/10.1021/acs.macromol.8b00691
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10
Viscoelastic and Orientational Relaxation of Linear and Ring Rouse Chains Undergoing Reversible End-Association and Dissociation
Autor: Yumi Matsumiya, Hiroshi Watanabe, Youngdon Kwon
Publikováno v: Macromolecules. 49:3593-3607
For dilute telechelic linear and ring Rouse chains undergoing reversible end-association and dissociation, the time (t) evolution equation was analytically formulated for the bond vector of the subchain (or segment), u[c](n,t) with n being the subcha
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a9e157c3a7c0fedb45b23fe38683a7a9
https://doi.org/10.1021/acs.macromol.6b00424
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