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

Journal Article · · Polymers for Advanced Technologies
DOI:https://doi.org/10.1002/pat.5234· OSTI ID:1771131
 [1];  [2];  [3];  [4]; ORCiD logo [5];  [6]; ORCiD logo [7];  [3]
  1. Univ. of Akron, OH (United States); Intel Corp., Hillsboro, OR (United States)
  2. Howard Univ., Washington, DC (United States); U.S. Pharmacopeia, Rockville, MD (United States)
  3. Univ. of Houston, TX (United States)
  4. Jackson State Univ., Jackson, MS (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. King Saud Univ., Riyadh (Saudi Arabia)
  7. Howard Univ., Washington, DC (United States)
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Abstract 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‐TiO 2 nanoparticles (BCP‐g‐TiO 2 ). Observation of characteristics IR peaks for PMMA and PS in BCP‐g‐TiO 2 nanoparticles and Transmission Electron Microscopy (TEM) results of the outer coating of core nanoparticle, validate the grafting to approach in synthesizing BCP‐g‐TiO 2 . Here we report that under the sharp dynamic thermal field, at low loading of BCP‐g‐TiO 2 , 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‐TiO 2 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 TiO 2 functionality to the BCP films, such as UVO absorptivity or biofouling prevention, important to potential new applications of such membranes.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR)
Grant/Contract Number:
SC0012704; AC02-06CH11357; DMR1901127; FA9550-12-1-0306; DE‐AC02‐06CH11357; DE‐SC0012704
OSTI ID:
1771131
Alternate ID(s):
OSTI ID: 1804825
Report Number(s):
BNL-221134-2021-JAAM
Journal Information:
Polymers for Advanced Technologies, Vol. 32, Issue 5; ISSN 1042-7147
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
BCP-g-TiO2 nanoparticles
unidirectional alignment
dynamic thermal annealing
PMMA-b-PS