Effect
of Systematic Hydrogenation on the Phase Behavior and Nanostructural
Dimensions of Block Copolymers
Posted on 2018-01-22 - 19:55
Unsaturated polydienes are frequently
hydrogenated to yield polyolefins that are more chemically stable.
Here, the effects of partial hydrogenation on the phase behavior and
nanostructure of polyisoprene-containing block copolymers are investigated.
To ensure access to the order–disorder transition temperature
(TODT) over a wide temperature range,
we examine copolymers with at least one random block. Dynamic rheological
and scattering measurements indicate that TODT increases linearly with increasing hydrogenation. Small-angle scattering
reveals that the temperature-dependence of the Flory–Huggins
parameter changes and the microdomain period increases, while the
interfacial thickness decreases. The influence of hydrogenation becomes
less pronounced in more constrained multiblock copolymers.
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Ashraf, Arman R.; Ryan, Justin J.; Satkowski, Michael M.; Smith, Steven D.; Spontak, Richard J. (2018). Effect
of Systematic Hydrogenation on the Phase Behavior and Nanostructural
Dimensions of Block Copolymers. ACS Publications. Collection. https://doi.org/10.1021/acsami.7b19433
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AUTHORS (5)
AA
Arman R. Ashraf
JR
Justin J. Ryan
MS
Michael M. Satkowski
SS
Steven D. Smith
RS
Richard J. Spontak