Synthesis and
Characterization of Amine-Epoxy-Functionalized
Polystyrene-block-Poly(glycidyl methacrylate) to
Manage Morphology and Covarying Properties for Self-Assembly
posted on 2023-03-28, 15:10authored byHongbo Feng, Chang-Geun Chae, Christopher Eom, Gordon S. W. Craig, Stuart J. Rowan, Paul F. Nealey
“Click” chemistry modification of a block
copolymer
to generate A-b-(B-r-C) block-random
copolymers (BRCs) has been proven as an effective method to manage
covarying properties of a block copolymer, such as the effective interaction
parameter (χeff) and the surface energy difference
of the two blocks (Δγ). Reported herein is a study of
the modification of the glycidyl methacrylate block of polystyrene-block-poly(glycidyl methacrylate) (S-b-G)
with amine-epoxy “click” chemistry. Three pairs of more
polar and less polar secondary amines are selected to modify S-b-G to make a series of lamellae-forming BRCs to determine
what ratio of the more polar amine in the random block (φC) is necessary to achieve Δγ = 0. The dependence
of the χeff of each BRC on φC is
determined from SAXS measurements. For advanced lithography applications,
a lamellae-forming BRC with sub-10 nm features and Δγ
= 0 is demonstrated. Utilizing the χeff –
φC relationship, a set of BRCs are synthesized from
a single S-b-G such that amine-epoxy modification
generates disordered, cylindrical, gyroidal, and lamellar morphologies,
depending on φC.