Kinetics of Mesoglobule Formation and Growth in Aqueous
Poly(N‑isopropylacrylamide) Solutions: Pressure
Jumps at Low and at High Pressure
Version 2 2019-09-18, 23:43
Version 1 2019-08-19, 19:17
Posted on 2019-09-18 - 23:43
The
mesoglobule formation and growth in an aqueous solution of
poly(N-isopropylacrylamide) are investigated using
time-resolved small-angle neutron scattering. Rapid pressure jumps
initiate phase separation at both low (below 20 MPa) and high pressures
(above 101 MPa). Measurements were carried out in a time range from
50 ms to ∼1650 s after the jump, covering a large range of
momentum transfers. The dehydration of the polymer at the coexistence
line is much stronger at low pressures than at high pressures, which
significantly affects the mechanism of phase separation: At low pressures,
the diffusion-limited coalescence of the mesoglobules is strongly
slowed down by the viscoelastic effect due to their dense shell. Moreover,
the target pressure has a strong influence on the relative importance
of these kinetic effects. In the high-pressure regime, the viscoelastic
effect does not play a role, and diffusion-limited coalescence proceeds
without hindrance.
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Niebuur, Bart-Jan; Chiappisi, Leonardo; Jung, Florian; Zhang, Xiaohan; Schulte, Alfons; Papadakis, Christine M. (2019). Kinetics of Mesoglobule Formation and Growth in Aqueous
Poly(N‑isopropylacrylamide) Solutions: Pressure
Jumps at Low and at High Pressure. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.9b00937
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AUTHORS (6)
BN
Bart-Jan Niebuur
LC
Leonardo Chiappisi
FJ
Florian Jung
XZ
Xiaohan Zhang
AS
Alfons Schulte
CP
Christine M. Papadakis