Effect of side chain and backbone length on lamellar spacing in polystyrene‐block‐poly(dimethyl siloxane) brush block copolymers

Fei, Huafeng; Yavitt, Benjamin M.; Kopanati, Gayathri; Watkins, James J.

doi:10.1002/polb.24824

Title: Effect of side chain and backbone length on lamellar spacing in polystyrene‐block‐poly(dimethyl siloxane) brush block copolymers

Journal Article · Wed Apr 10 00:00:00 EDT 2019 · Journal of Polymer Science. Part B, Polymer Physics

DOI:https://doi.org/10.1002/polb.24824· OSTI ID:1506159

^[1]; Yavitt, Benjamin M. ^[1]; Kopanati, Gayathri ^[1]; Watkins, James J. ^[1]

Department of Polymer Science and Engineering University of Massachusetts Amherst 120 Governors Drive, Amherst Massachusetts, 01003

ABSTRACT We report the synthesis of polystyrene‐block‐poly(dimethyl siloxane) (PS‐ b ‐PDMS) brush block copolymers (BBCPs) through sequential ROMP of norbornene‐modified macromonomers (‐NB) and explore the effect of side chain length (N _sc ) and total backbone degree of polymerization (N _bb ) on the self‐assembly of lamellar morphologies. Group I (PS‐NB M _n = 2.9 kg/mol, PDMS‐NB M _n = 4.8 kg/mol) exhibits asymmetric side chains, while Group II (PS‐NB M _n = 4.7 kg/mol, PDMS‐NB M _n = 4.8 kg/mol) possess a more symmetric arrangement. Both families rapidly self‐assemble into well‐ordered lamellar morphologies with domain spacings (d ₀ ) ranging from d ₀ = 54 to 140 nm. The scaling relationship between d ₀ and N _bb (d ₀ ~N _bb ^α ) was determined as the measure of backbone flexibility. Exponents of α = 0.71 and α = 0.81 are observed for Groups I and II, respectively, indicating the BBCPs adopt an extended backbone conformation. The presence of a low T _g side chain such as PDMS increases apparent flexibility of the backbone. The interplay between contrasting characteristics of the side chains is discussed and reveals the importance of understanding the physical consequences of block architecture on controlling BBCP assembly. These findings provide necessary information for future investigations of complex phases and well‐defined nanostructures fabricated using the brush architecture. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019 , 57 , 691–699

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Sponsoring Organization:: USDOE

OSTI ID:: 1506159

Journal Information:: Journal of Polymer Science. Part B, Polymer Physics, Journal Name: Journal of Polymer Science. Part B, Polymer Physics Vol. 57 Journal Issue: 11; ISSN 0887-6266

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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