scholarly journals Impact of Solvent Quality on the Density Profiles of Looped Triblock Copolymer Brushes by Neutron Reflectivity Measurements

2008 ◽  
Vol 41 (5) ◽  
pp. 1745-1752 ◽  
Author(s):  
Zhenyu Huang ◽  
Jose Alonzo ◽  
Ming Liu ◽  
Haining Ji ◽  
Fang Yin ◽  
...  
Keyword(s):  
Triblock Copolymer ◽  
Neutron Reflectivity ◽  
Density Profiles ◽  
Solvent Quality ◽  
Copolymer Brushes

Multi-Stimuli-Responsive Mesoporous Membranes and Effect of Molecular Architecture on Thermo- and pH-Responsive Behavior of the grafted Block Copolymer brushes

2019 ◽  
Author(s):  
Yanchun Tang ◽  
Kohzo Ito ◽  
Hideaki Yokoyama
Keyword(s):  
Polymer Brushes ◽  
Diblock Copolymers ◽  
Neutron Reflectivity ◽  
Molecular Architecture ◽  
Stimuli Responsive ◽  
Responsive Polymer ◽  
The Matrix ◽  
Stable Part ◽  
Copolymer Brushes ◽  
Mesoporous Membranes

In this study, we prepared ultrafiltration membranes with a decoupled responses of filtration property to temperature and pH. The membrane preparation method was developed based on our previous work. We utilized methanol-supercritical carbon dioxide (methanol-scCO<sub>2</sub>) selective swelling method to introduce nanopores to block copolymers containing poly(diethylene glycol) methyl ether methacrylate (PMEO<sub>2</sub>MA), poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) and polystyrene (PS) blocks. Formation of the mesoporous barrier layer with PS being the mechanically stable part of the matrix was driven by selective swelling of the PMEO<sub>2</sub>MA-b-PDMAEMA domains. Due to the selective swelling of PMEO<sub>2</sub>MA or PDMAEMA domains to introduce pores, the interior of the pores are covered with PMEO<sub>2</sub>MA or PDMAEMA blocks after pore formation. The PMEO<sub>2</sub>MA-b-PDMAEMA polymer brushes are naturally attached on the pore walls and worked as functional gates. PMEO<sub>2</sub>MA is a non-toxic, neutral thermo-responsive polymer with LCST at 26 ᴼC. PDMAEMA is a typical weak polyelectrolyte with pK<sub>a</sub> value at 7.0-7.5 and also a thermo-responsive polymer revealed a LCST of 20-80 °C in aqueous solution. Therefore, these membranes were expected to have multi dimensions as function of the combination of temperature and pH. Moreover, to understand the detail of the temperature and pH depended conformation transitions of PMEO<sub>2</sub>MA-b-PDMAEMA brushes, those diblock copolymers were end-tethered on flat substrates and analyzed via neutron reflectivity (NR).

On‐Surface RAFT Polymerization using Oxygen to form Triblock Copolymer Brushes

2021 ◽  
pp. 2100270
Author(s):  
Ji Hoon Lee ◽  
Hyun Ji Seo ◽  
Seung Yeon Lee ◽  
Woo Kyung Cho ◽  
Kyung‐sun Son
Keyword(s):  
Triblock Copolymer ◽  
Raft Polymerization ◽  
Copolymer Brushes

Synthesis of Triblock Copolymer Brushes by Surface-Initiated Atom Transfer Radical Polymerization

2002 ◽  
Vol 35 (14) ◽  
pp. 5410-5416 ◽  
Author(s):  
Jong-Bum Kim ◽  
Wenxi Huang ◽  
Merlin L. Bruening ◽  
Gregory L. Baker
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Triblock Copolymer ◽  
Atom Transfer ◽  
Copolymer Brushes

Preparation of amphiphilic triblock copolymer brushes for surface patterning

2003 ◽  
Vol 14 (10) ◽  
pp. 1075-1080 ◽  
Author(s):  
Wenxi Huang ◽  
Jong-Bum Kim ◽  
Gregory L Baker ◽  
Merlin L Bruening
Keyword(s):  
Triblock Copolymer ◽  
Surface Patterning ◽  
Amphiphilic Triblock Copolymer ◽  
Copolymer Brushes

Determination of nonmagnetic density profiles using polarized neutron reflectivity

1992 ◽  
Author(s):  
Charles F. Majkrzak ◽  
N. F. Berk ◽  
John F. Ankner ◽  
Sushil K. Satija ◽  
Terence P. Russell
Keyword(s):  
Neutron Reflectivity ◽  
Density Profiles ◽  
Polarized Neutron

Neutron Reflectivity Study of the Density Profile of a Model End-Grafted Polymer Brush: Influence of Solvent Quality

1994 ◽  
Vol 73 (25) ◽  
pp. 3407-3410 ◽  
Author(s):  
A. Karim ◽  
S. K. Satija ◽  
J. F. Douglas ◽  
J. F. Ankner ◽  
L. J. Fetters
Keyword(s):  
Density Profile ◽  
Polymer Brush ◽  
Neutron Reflectivity ◽  
Grafted Polymer ◽  
Solvent Quality ◽  
Influence Of Solvent

Self-assembled morphologies of ABA triblock copolymer brushes in selective solvents

2013 ◽  
Vol 138 (11) ◽  
pp. 114905 ◽  
Author(s):  
Jihua Xu ◽  
Yuhua Yin ◽  
Zheng Wang ◽  
Run Jiang ◽  
Baohui Li ◽  
...  
Keyword(s):  
Triblock Copolymer ◽  
Selective Solvents ◽  
Aba Triblock Copolymer ◽  
Self Assembled ◽  
Copolymer Brushes
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