Alignment frustration in block copolymer films with block copolymer grafted TiO2 nanoparticles under soft-shear cold zone annealing

Samant, Saumil; Hailu, Shimelis; Singh, Maninderjeet; Pradhan, Nihar; Yager, Kevin; Al‐Enizi, Abdullah M.; Raghavan, Dharmaraj; Karim, Alamgir

doi:10.1002/pat.5234

Alignment frustration in block copolymer films with block copolymer grafted TiO₂ nanoparticles under soft-shear cold zone annealing

Journal Article · Mon Feb 08 00:00:00 EST 2021 · Polymers for Advanced Technologies

DOI:https://doi.org/10.1002/pat.5234· OSTI ID:1771131

Samant, Saumil ^[1]; Hailu, Shimelis ^[2]; Singh, Maninderjeet ^[3]; Pradhan, Nihar ^[4]; ^[5]; Al‐Enizi, Abdullah M. ^[6]; ^[7]; Karim, Alamgir ^[3]

Univ. of Akron, OH (United States); Intel Corp., Hillsboro, OR (United States)
Howard Univ., Washington, DC (United States); U.S. Pharmacopeia, Rockville, MD (United States)
Univ. of Houston, TX (United States)
Jackson State Univ., Jackson, MS (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
King Saud Univ., Riyadh (Saudi Arabia)
Howard Univ., Washington, DC (United States)

Block copolymers (BCPs) have received significant attention as promising candidates for sequestering nanoparticles and fabrication of aligned nanostructures with optimal optical or electrical properties. We investigate the influence of static and dynamic thermal field on the alignment of polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) BCP morphology with the loading of novel poly(methyl methacrylate-block-Polystyrene) (PMMA-b-PS)-grafted-TiO₂ nanoparticles (BCP-g-TiO₂). Observation of characteristics IR peaks for PMMA and PS in BCP-g-TiO₂ nanoparticles and Transmission Electron Microscopy (TEM) results of the outer coating of core nanoparticle, validate the grafting to approach in synthesizing BCP-g-TiO₂. In this work, we report that under the sharp dynamic thermal field, at low loading of BCP-g-TiO₂, there is good dispersion of nanoparticles in unidirectionally aligned BCP matrix in film interior probed by GISAXS, while, at high nanoparticle loading (~10 wt%), there is local frustration in the unidirectional alignment of the BCP matrix due to aggregation of BCP-g-TiO₂ nanoparticles. However, Grazing incidence small angle X-ray scattering (GISAXS) shows clearly that the BCP films remain largely locally ordered at the domain scale, despite these large perturbations to long-range ordering even at high loading level, while bringing in new TiO₂ functionality to the BCP films, such as UVO absorptivity or biofouling prevention, important to potential new applications of such membranes.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; SC0012704

OSTI ID:: 1771131

Alternate ID(s):: OSTI ID: 1804825

Report Number(s):: BNL--221134-2021-JAAM

Journal Information:: Polymers for Advanced Technologies, Journal Name: Polymers for Advanced Technologies Journal Issue: 5 Vol. 32; ISSN 1042-7147

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Alignment frustration in block copolymer films with block copolymer grafted TiO2 nanoparticles under soft-shear cold zone annealing

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