Interphase Structures and Dynamics near Nanofiller
Surfaces in Polymer Solutions
Posted on 2018-11-16 - 18:07
We
report the in situ structures and dynamics of hydrogenated polybutadiene
(PB) chains bound to carbon black nanoparticle surfaces in polymer
solutions composed of deuterated PB and deuterated toluene using small-angle
neutron scattering and neutron spin-echo techniques together with
molecular dynamics (MD) simulations. The experimental results showed
that the swollen bound polymer chains exhibit the collective dynamics
(the so-called breathing mode) at polymer concentrations (c) below and above the overlap polymer concentration (c*) (i.e., 0.61 < c/c* < 1.83), where the concentration profiles of the bound polymer
remained unchanged with the different c values. Interestingly,
the collective dynamics slowed down by a factor of 2 compared to that
in pure d-toluene when the chain lengths of the bound
polymer and matrix polymer were equal. However, when the free polymer
chains were longer than the bound polymer chains, the decrease in
collective dynamics was not as significant. MD simulations were performed
to explore the interfacial event as a whole. As a result, we found
that the matrix polymer chains, whose length is equal to that of the
bound polymer, can be accommodated in the bound polymer layer effectively
and are “strangulated” by the bound polymer chains,
while the longer matrix polymer chains only partly penetrate into
the bound chains and the diffusion behavior was hardly affected compared
to that in bulk.
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Koga, Tadanori; Barkley, Deborah; Nagao, Michihiro; Taniguchi, Takashi; Carrillo, Jan-Michael Y.; Sumpter, Bobby G.; et al. (2018). Interphase Structures and Dynamics near Nanofiller
Surfaces in Polymer Solutions. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.8b01615
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AUTHORS (11)
TK
Tadanori Koga
DB
Deborah Barkley
MN
Michihiro Nagao
TT
Takashi Taniguchi
JC
Jan-Michael Y. Carrillo
BS
Bobby G. Sumpter
TM
Tomomi Masui
HK
Hiroyuki Kishimoto
MK
Maho Koga
JR
Jonathan G. Rudick
ME
Maya K. Endoh