Cited Article: Holt JK. Fast mass transport through sub-2-nanometer carbon nanotubes
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Number of Citing Articles: 1 new records this week (1 in this e-mail)
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AU Mu, MF
Clarke, N
Composto, RJ
Winey, KI
AF Mu, Minfang
Clarke, Nigel
Composto, Russell J.
Winey, Karen I.
TI Polymer Diffusion Exhibits a Minimum with Increasing Single-Walled
Carbon Nanotube Concentration
SO MACROMOLECULES
LA English
DT Article
ID ELECTRICAL-CONDUCTIVITY; ENTANGLED POLYMERS; MOLECULAR-WEIGHT;
NANOCOMPOSITES; REPTATION; CHAIN; MELTS; COMPOSITES; STABILITY; NETWORKS
AB Nanoparticles present a new frontier for understanding polymer dynamics
in complex, nanoscale environments. We report that the addition of
single-walled carbon nanotubes(SWCNTs) produces a minimum in the
diffusion coefficient with increasing nanoparticle concentration, phi.
Initially, tracer diffusion coefficients (D) are suppressed with
increasing phi and then increase beyond a critical concentration,
phi(crit) < 1 vol %. Shorter tracer chains exhibit a greater slowing
down than longer chains, whereas longer matrix chains decrease the
value of phi(crit). The experimental results are discussed in terms of
locally anisotropic diffusion perpendicular and parallel to the
nanotube Filler and Simulated using a trap model that defines a trap
size and the extent of slowing perpendicular to the cylindrical trap.
The simulated diffusion coefficients capture both the initial decrease
in D attributed to isolated traps and the recovery of D above phi(crit)
corresponding to trap percolation. Nanoparticles influence polymer
diffusion in fascinating ways and will refine our understanding of
polymer reptation and might also inform the study of biopolymer
diffusion in living systems.
C1 [Mu, Minfang; Composto, Russell J.; Winey, Karen I.] Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA.
[Clarke, Nigel] Univ Durham, Dept Chem, Durham DH1 3LE, England.
RP Winey, KI, Univ Penn, Dept Mat Sci & Engn, 3231 Walnut St,
Philadelphia, PA 19104 USA.
EM winey@seas.upenn.edu
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NR 38
TC 0
PU AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0024-9297
DI 10.1021/ma901122s
PD SEP 22
VL 42
IS 18
BP 7091
EP 7097
SC Polymer Science
GA 492YR
UT ISI:000269699400034
ER
EF
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