3 years ago

Realizing 5.4 nm Full Pitch Lamellar Microdomains by a Solid-State Transformation

Realizing 5.4 nm Full Pitch Lamellar Microdomains by a Solid-State Transformation
Javid Rzayev, Zhiwei Sun, Thomas P. Russell, Gajin Jeong, Jose Kenneth D. Mapas, Duk Man Yu
A simple method was developed to realize a self-assembled block copolymer (BCP) lamellar microdomain morphology with a full pitch of 5.4 nm through an acid hydrolysis of poly(solketal methacrylate-b-styrene) (PSM-b-PS). The acid hydrolysis transforms PSM-b-PS, having two hydrophobic blocks, into poly(glycerol monomethacrylate-b-styrene) (PGM-b-PS), having one hydrophilic and one hydrophobic block. This transformation markedly increases the segmental interaction parameter such that a phase-mixed PSM-b-PS can be transformed in the solid state into a microphase-separated BCP without the use of any additives. Correlation hole scattering of the PSM-b-PS in the phase mixed state yields a segmental interaction parameter (χ) given by χ = 0.0196 + 4.694/T, where T is the absolute temperature. With the symmetric BCPs used in this study, the ordered lamellar microdomain pitch was determined by small-angle X-ray scattering (SAXS) as a function of the degree of polymerization (16 ≤ N ≤ 1246). For the lamellar microdomains of PGM-b-PS, the scattering profiles show many higher order reflections with an increase in the domain spacing (L0). The lowest molar mass sample (Mn = 2200 g/mol, N = 16) had sub-3 nm microdomains after conversion to PGM-b-PS.

Publisher URL: http://dx.doi.org/10.1021/acs.macromol.7b01443

DOI: 10.1021/acs.macromol.7b01443

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