Synthesis of azobenzene-containing side chain liquid crystalline diblock copolymers using RAFT polymerization and photo-responsive behavior

2013 ◽  
Vol 130 (3) ◽  
pp. 2165-2175 ◽  
Author(s):  
Wuqiong Sun ◽  
Xiaohua He ◽  
Xiaojuan Liao ◽  
Shaoliang Lin ◽  
Wei Huang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Raft Polymerization ◽  
Side Chain ◽  
Responsive Behavior

Design, synthesis, and phase behaviors of a novel triphenylene-based side chain liquid crystalline diblock copolymer

2018 ◽  
Vol 42 (16) ◽  
pp. 13581-13588
Author(s):  
Jianfeng Ban ◽  
Lulu Pan ◽  
Bo Shi ◽  
Hailiang Zhang
Keyword(s):  
Diblock Copolymer ◽  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Weight Fraction ◽  
Side Chain ◽  
Design Synthesis ◽  
Phase Behaviors

Influence of the weight fraction of PMT6S on the phase behaviors of diblock copolymers.

Direct Observation of a Smectic Bilayer Microstructure in Side-Chain Liquid Crystalline Diblock Copolymers

2001 ◽  
Vol 34 (24) ◽  
pp. 8574-8579 ◽  
Author(s):  
Mitchell Anthamatten ◽  
Jung-Sheng Wu ◽  
Paula T. Hammond
Keyword(s):  
Direct Observation ◽  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Side Chain

Hierarchical Structures of Hydrogen-Bonded Liquid-Crystalline Side-Chain Diblock Copolymers in Nanoparticles

2012 ◽  
Vol 45 (21) ◽  
pp. 8743-8751 ◽  
Author(s):  
Antti J. Soininen ◽  
Antti Rahikkala ◽  
Juuso T. Korhonen ◽  
Esko I. Kauppinen ◽  
Raffaele Mezzenga ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Hierarchical Structures ◽  
Side Chain ◽  
Hydrogen Bonded

scholarly journals Synthesis and characteristics of novel azo-based diblock copolymers and their self-assembly behavior via solvents and thermal annealing

e-Polymers ◽  
2017 ◽  
Vol 17 (6) ◽  
pp. 523-535 ◽  
Author(s):  
Athmen Zenati ◽  
Yang-Kyoo Han
Keyword(s):  
Self Assembly ◽  
Nematic Phase ◽  
Weight Control ◽  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Raft Polymerization ◽  
Gel Permeation Chromatography ◽  
Kinetic Studies ◽  
Morphological Properties ◽  
Scanning Calorimetry

AbstractA series of azo-based diblock copolymers (DBCs) with various compositions were successfully synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization in anisole with PCAEMA-CTA (macro-CTA), DOPAM (new acrylamide monomer) and AIBN (initiator). Kinetic studies on diblock copolymerization manifested a controlled/living manner with good molecular weight control. Structures and properties of monomers and DBCs were determined by 1H nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC) and gel permeation chromatography (GPC). Liquid crystalline (LC) phases and morphological properties were investigated using optical polarizing microscope (OPM), atomic force microscopy (AFM), scanning electron microscopy (SEM) and small-angle X-ray scattering (SAXS). Experimental results demonstrated that the prepared PCAEMA-CTA and DBCs possessed low polydispersity index (≤1.37). All DBCs revealed sharp endothermic transition peaks corresponding to the smectic-to-nematic phase. DBCs with high azo contents showed batonnet textures of the smectic phase whereas DBCs of low azo segments displayed threaded textures of the nematic phase. DBC with 49 wt% of azo side-chains generated a lamellar compared to DBCs with low azo block (≤41 wt%) or non-azo block (≤38 wt%) which produced hexagonal-type nanostructures. In addition, all DBCs exhibited reversible trans-cis photoisomerization behavior under UV irradiation and dark storage at different intervals of time.

scholarly journals Initiation of RAFT Polymerization: Electrochemically Initiated RAFT Polymerization in Emulsion (Emulsion eRAFT), and Direct PhotoRAFT Polymerization of Liquid Crystalline Monomers

2021 ◽  
Vol 74 (1) ◽  
pp. 56 ◽  
Author(s):  
Caroline Bray ◽  
Guoxin Li ◽  
Almar Postma ◽  
Lisa T. Strover ◽  
Jade Wang ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Colloidal Stability ◽  
Molar Mass ◽  
Raft Polymerization ◽  
Monomer Conversion ◽  
Continuous Phase ◽  
Side Chain ◽  
Crystalline Polymers ◽  
Reversible Addition ◽  
Polymerization Conditions

We report on two important advances in radical polymerization with reversible addition–fragmentation chain transfer (RAFT polymerization). (1) Electrochemically initiated emulsion RAFT (eRAFT) polymerization provides rapid polymerization of styrene at ambient temperature. The electrolytes and mediators required for eRAFT are located in the aqueous continuous phase separate from the low-molar-mass-dispersity macroRAFT agent mediator and product in the dispersed phase. Use of a poly(N,N-dimethylacrylamide)-block-poly(butyl acrylate) amphiphilic macroRAFT agent composition means that no added surfactant is required for colloidal stability. (2) Direct photoinitiated (visible light) RAFT polymerization provides an effective route to high-purity, low-molar-mass-dispersity, side chain liquid-crystalline polymers (specifically, poly(4-biphenyl acrylate)) at high monomer conversion. Photoinitiation gives a product free from low-molar-mass initiator-derived by-products and with minimal termination. The process is compared with thermal dialkyldiazene initiation in various solvents. Numerical simulation was found to be an important tool in discriminating between the processes and in selecting optimal polymerization conditions.

Preparation of Ag nanoparticles termini-protected side-chain liquid crystalline azobenzene polymers by RAFT polymerization

2007 ◽  
Vol 45 (23) ◽  
pp. 5380-5386 ◽  
Author(s):  
Jiangang Gao ◽  
Youyi Sun ◽  
Jingli Zhou ◽  
Zhi Zheng ◽  
Hongwei Chen ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Liquid Crystalline ◽  
Raft Polymerization ◽  
Side Chain

Side Chain Liquid Crystalline Block Copolymers With Chiral Smectic C* Mesogens

1996 ◽  
Vol 425 ◽  
Author(s):  
Wen Yue Zheng ◽  
Paula T. Hammond
Keyword(s):  
Glass Transition ◽  
Block Copolymers ◽  
Anionic Polymerization ◽  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Side Chain ◽  
Synthesis And Characterization ◽  
Glass Transition Temperatures ◽  
Smectic C

AbstractA new series of side chain liquid crystalline-amorphous diblock copolymers has been successfully synthesized using chiral mesogens. Anionic polymerization techniques have been used to make these monodisperse diblock materials. Preliminary studies suggest that these microphase segregated diblock copolymers exhibit a smectic C* phase. This mesophase exists between and above the glass transition temperatures of the two polymer blocks. Synthesis and characterization of these novel materials are discussed.

Mesogen Orientation within Smectic C* Side Chain Liquid Crystalline Diblock Copolymers

1998 ◽  
Vol 31 (8) ◽  
pp. 2686-2689 ◽  
Author(s):  
Wen-Yue Zheng ◽  
Ramon J. Albalak ◽  
Paula T. Hammond
Keyword(s):  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Side Chain ◽  
Smectic C
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