Controlled co‐solvent vapor annealing and the importance of quenching conditions in thin‐film block copolymer self‐assembly. Issue 15 (5th May 2017)

• Record Type: Journal Article
• Authors: Stahl, Brian C.; Kramer, Edward J.; Hawker, Craig J.; Lynd, Nathaniel A.
• Is Part Of: Journal of polymer science. Volume 55:Issue 15(2017)
• Page Start: 1125
• Page End: 1130
• Publication Date: 2017-05-05
• Subjects: block copolymer -- self‐assembly -- solvent annealing; 547
• DOI: 10.1002/polb.24366
• Languages: English
• ISSNs: 0887-6266

Abstract

ABSTRACT: A controlled co‐solvent vapor annealing system was designed and constructed to investigate the effects of solvent vapor activity during the rapid ambient quenching process on the morphology of a cylinder‐forming poly(styrene)‐ b ‐poly (ethylene oxide) (PS‐PEO) annealed in toluene and water vapor. A phase transformation from cylinders in the bulk to close‐packed spheres in swollen thin films occurred, which was reversed upon quenching with dry nitrogen. Quenching with humidified nitrogen preserved the spherical morphology but could significantly alter domain spacing and reduce long‐range order in the dried films under some circumstances. Specifically, long‐range order in the quenched films was found to decrease as the quenching humidity decreased from the humidity used during annealing, and the best long‐range order was obtained when the humidity remained consistent throughout both annealing and quenching. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys.2017, 55, 1125–1130 Abstract : A controlled co‐solvent vapor annealing system was designed and constructed to investigate the effects of solvent vapor composition during the rapid ambient quenching process on the morphology of a diblock copolymer thin film. Quenching with consistent humidity was necessary to preserve morphological features formed during annealing.