TY - JOUR

T1 - Interfacial diffusion phenomena of cyclic and linear polymers

AU - Kawaguchi, Daisuke

N1 - Publisher Copyright:
© 2014 The Society of Rheology, Japan.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2015

Y1 - 2015

N2 - Diffusion of cyclic and linear polymers at interfaces was studied. Interdiffusion of cyclic polystyrene/cyclic deuterated polystyrene was measured by dynamic secondary ion mass spectroscopy as functions of temperature and molecular weight. Diffusion coefficient of cyclic polystyrene with weight-average molecular weight of 113k is twice as large as that of the corresponding linear one at all the temperatures employed. This result clearly shows that both the linear and cyclic polystyrenes have the same temperature dependence of segmental frictional coefficient. At an iso-free volume condition, diffusion coefficient of cyclic polystyrene is larger than that of the linear one at a given molecular weight. The short-time interdiffusion at an interface of linear polystyrene / linear deuterated polystyrene having different molecular weights was examined by time-resolved neutron reflectivity measurements. The model scattering length density profiles obtained by solving a partial differential equation for the diffusion process were used to analyze the data. The results indicate that even though the molecular weights of both components are larger than the critical molecular weight for entanglement, the initial interfacial broadening of bilayer films with different molecular weight proceeds with asymmetric mobility being inversely proportional to the molecular weight.

AB - Diffusion of cyclic and linear polymers at interfaces was studied. Interdiffusion of cyclic polystyrene/cyclic deuterated polystyrene was measured by dynamic secondary ion mass spectroscopy as functions of temperature and molecular weight. Diffusion coefficient of cyclic polystyrene with weight-average molecular weight of 113k is twice as large as that of the corresponding linear one at all the temperatures employed. This result clearly shows that both the linear and cyclic polystyrenes have the same temperature dependence of segmental frictional coefficient. At an iso-free volume condition, diffusion coefficient of cyclic polystyrene is larger than that of the linear one at a given molecular weight. The short-time interdiffusion at an interface of linear polystyrene / linear deuterated polystyrene having different molecular weights was examined by time-resolved neutron reflectivity measurements. The model scattering length density profiles obtained by solving a partial differential equation for the diffusion process were used to analyze the data. The results indicate that even though the molecular weights of both components are larger than the critical molecular weight for entanglement, the initial interfacial broadening of bilayer films with different molecular weight proceeds with asymmetric mobility being inversely proportional to the molecular weight.

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U2 - 10.1678/rheology.42.285

DO - 10.1678/rheology.42.285

M3 - Article

AN - SCOPUS:84924082328

VL - 42

SP - 285

EP - 295

JO - Nihon Reoroji Gakkaishi

JF - Nihon Reoroji Gakkaishi

SN - 0387-1533

IS - 5

ER -