Transmission electron microscopy study of solvent-induced phase morphologies of environmentally responsive mixed homopolymer brushes on silica particles

The Journal of Physical Chemistry. B
Lei Zhu, Bin Zhao

Abstract

We report in this work a transmission electron microscopy study of phase morphologies of environmentally responsive mixed poly( t-butyl acrylate) (P tBA)/polystyrene (PS) brushes and mixed poly(acrylic acid) (PAA)/PS brushes on 180 nm silica particles after treatments with nonselective good solvents and selective solvents, respectively. Mixed P tBA/PS brushes were grown from Y-initiator-functionalized silica particles by sequential atom transfer radical polymerization and nitroxide-mediated radical polymerization. Mixed PAA/PS brushes were prepared from mixed P tBA/PS brushes by removal of the t-butyl groups. For mixed P tBA/PS brushes with P tBA M n of 24.2 kDa and PS M n of 23.0 kDa and the corresponding mixed PAA/PS brushes, random worm-like, nearly bicontinuous nanostructures were formed from lateral microphase separation when the particles were cast from nonselective good solvents (chloroform for mixed P tBA/PS brushes and N, N-dimethylformamide for mixed PAA/PS brushes). The feature sizes were on the order of polymer chain root-mean-square end-to-end distances ( approximately 10 nm). In contrast, mixed P tBA/PS brushes with lower molecular weights (P tBA M n = 10.4 kDa and PS M n = 11.9 kDa) did not strongly phase separat...Continue Reading

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Citations

Jan 10, 2012·ACS Applied Materials & Interfaces·Leonid Ionov, Sergiy Minko
Apr 26, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Nicel C Estillore, Rigoberto C Advincula
Apr 12, 2011·The Journal of Chemical Physics·Yueqiang WangLei Zhu
Feb 26, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yuwei ChenChaohui Tong
May 1, 2020·ChemPlusChem·Wangmeng HouHanying Zhao
Sep 8, 2020·Advanced Healthcare Materials·Danyang LiJulien E Gautrot
Jun 15, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·S MorschJ P S Badyal
Jun 1, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Cheng Hao LeePei Li
Aug 14, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Huachen TaoEugenia Kumacheva
Mar 27, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Yuli XuYing Hu

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