Phase Behavior of Mixed Polymer Brushes Grown from
Ultrathin Coatings
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Posted on 2019-08-14 - 19:07
Experimental validation of the predicted
melt phase behavior of
A/B mixed brush on planar substrate is presented using poly(methyl
methacrylate) (A)/ polystyrene (B) (PMMA/PS) with equal number of
A/B chains as an example. Well-defined mixed A/B brushes are synthesized
using a single component inimer coating to achieve high grafting density
(0.9 chains/nm2), uniformity of grafting sites, and predictable
chain length. The inimer coating is a copolymer of nitroxide-mediated
polymerization (NMP) inimer, atom transfer radical polymerization
(ATRP) inimer, styrene, and glycidyl methacrylate (GMA). Cross-linking
of the film provides the required stability to probe the melt morphology.
Our studies show that even with equal grafting density of the A and
B the morphology can be modulated by varying the length of B chains
while keeping that of A fixed. We show the transition of self-assembled
structures from disorder to cylinder to ripple phase at sub-30 nm
length scale on a planar surface by thermal annealing of mixed brushes.
These results are supported by a phase diagram established through
Monte Carlo simulation using a coarse-grained particle-based model.
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Wei, Wei; Kim, Tae-Yi; Balamurugan, A.; Sun, Jian; Chen, Ri; Ghosh, Atanu; et al. (2019). Phase Behavior of Mixed Polymer Brushes Grown from
Ultrathin Coatings. ACS Publications. Collection. https://doi.org/10.1021/acsmacrolett.9b00501