Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: S1.00035 : Phase behavior of the blend of rod-coil block copolymer with the corresponding coil homopolymer
Author:
We investigated the self-assembly behavior of the blends of a
rod-coil block
copolymer DEH-PPV-$b$-PMMA with the PMMA homopolymers (h-PMMA)
with various
molecular weights to clarify how the rigidity and
self-organization of the
rod block would affect the morphologies and the phase behavior
comparing
with those of coil-coil block copolymer blending. SAXS/WAXS along
with TEM
were used to reveal the nanostructure in detail. In the case of
the blends
with h-PMMA with lower molecular weight, the morphology was strongly
dependent on the interplay between microphase separation and nematic
interaction. The h-PMMA tended to localize into the middle of PMMA
nanodomain and formed a lamellar structure irrespective of the
volume
fraction of h-PMMA. At high volume fraction of h-PMMA, a sponge
phase was
found to coexist with the lamellar structure. The interdomain
spacing
increased with the overall PMMA content. Macrophase separations
became
dominate in the blends with h-PMMA of high molecular weight. WAXS
studies of
the blends indicated the amorphous h-PMMA reduced the correlation
of the
rod-rod ordered packing. Upon heating, the lamellar structure
transformed
into a disordered state, and the T$_{ODT}$ was found to be
reduced by adding
h-PMMA with lower molecular weight.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.S1.35
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