scholarly journals Self-Seeding Procedure for Obtaining Stacked Block Copolymer Lamellar Crystals in Solution

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1676
Author(s):  
Brahim Bessif ◽  
Thomas Pfohl ◽  
Günter Reiter
Keyword(s):  
Block Copolymer ◽  
Polyethylene Oxide ◽  
Homogeneous Nucleation ◽  
Diblock Copolymers ◽  
Polymer Concentration ◽  
Solubility Limit ◽  
The Self ◽  
Lateral Size ◽  
Linear Extrapolation ◽  
Lamellar Crystals

We examined the formation of self-seeded platelet-like crystals from polystyrene-block-polyethylene oxide (PS-b-PEO) diblock copolymers in toluene as a function of polymer concentration (c), crystallization temperature (TC), and self-seeding temperature (TSS). We showed that the number (N) of platelet-like crystals and their mean lateral size (L) can be controlled through a self-seeding procedure. As (homogeneous) nucleation was circumvented by the self-seeding procedure, N did not depend on TC. N increased linearly with c and decayed exponentially with TSS but was not affected significantly by the time the sample was kept at TSS. The solubility limit of PS-b-PEO in toluene (c*), which was derived from the linear extrapolation of Nc→ 0 and from the total deposited mass of the platelets per area (MCc→0), depended on TC. We have also demonstrated that at low N, stacks consisting of a (large) number (η) of uniquely oriented lamellae can be achieved. At a given TC, L was controlled by N and η as well as by ∆c=c−c∗. Thus, besides being able to predict size and number of platelet-like crystals, the self-seeding procedure also allowed control of the number of stacked lamellae in these crystals.

The Self-Assembly of an Amphiphilic Block Copolymer: A Dissipative Particle Dynamics Study

2005 ◽  
Vol 42 (3) ◽  
pp. 180-183 ◽  
Author(s):  
S. G. Schulz ◽  
U. Frieske ◽  
H. Kuhn ◽  
G. Schmid ◽  
F. Müller ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Self Assembly ◽  
Dissipative Particle Dynamics ◽  
Particle Dynamics ◽  
The Self ◽  
Amphiphilic Block Copolymer

Synthesis of PMMA-b-PS Block Copolymer by Emulsion ATRP and its Self-Assembly Property

2013 ◽  
Vol 705 ◽  
pp. 115-119
Author(s):  
Bao Yong Tian ◽  
Er Jun Tang ◽  
Miao Yuan ◽  
Rui Xia Hao ◽  
Cun Man Li ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Block Copolymer ◽  
Self Assembly ◽  
Potential Application ◽  
Morphological Characteristic ◽  
Living Polymerization ◽  
The Self ◽  
Emulsion System ◽  
Copolymer Concentration ◽  
Ft Ir

The well-defined block copolymer PMMA-b-PS was prepared by two-step ATRP in emulsion system. GPC results indicate that Mn increased linearly with conversion and polydispersity remained relatively narrow. It presents the characteristics of living polymerization in emulsion system. FT-IR demonstrated that block copolymer PMMA-b-PS could be successfully synthesized by ATRP with macroinitiator PMMA-Cl in emulsion system. The morphological characteristic of the self-assembly depends on the block copolymer concentration and transforms between spheres and rodlike micelles. The property indicates a perfect potential application in drug delivery materials.

Block copolymer self-assembly assisted fabrication of laterally organized- and stacked- nanoarrays

2021 ◽  
Author(s):  
Vignesh Suresh ◽  
Ah Bian Chew ◽  
Christina Yuan Ling Tan ◽  
Hui Ru Tan
Keyword(s):  
Block Copolymer ◽  
Self Assembly ◽  
The Self ◽  
Functional Surfaces ◽  
Self Assembled ◽  
Block Copolymer Lithography ◽  
Unique Surface ◽  
Copolymer Lithography

Abstract Block copolymer (BCP) self-assembly processes are often seen as reliable techniques for advanced nanopatterning to achieve functional surfaces and create templates for nanofabrication. By taking advantage of the tunability in pitch, diameter and feature-to-feature separation of the self-assembled BCP features, complex, laterally organized- and stacked- multicomponent nanoarrays comprising of gold and polymer have been fabricated. The approaches not only demonstrate nanopatterning of up to two levels of hierarchy but also investigate how a variation in the feature-to-feature gap at the first hierarchy affects the self-assembly of polymer features at the second. Such BCP self-assembly enabled multicomponent nanoarray configurations are rarely achieved by other nanofabrication approaches and are particularly promising for pushing the boundaries of block copolymer lithography and in creating unique surface architectures and complex morphologies at the nanoscale.

Controlling the Growth of Stacks of Correlated Lamellar Crystals of a Block Copolymer

2019 ◽  
Vol 52 (24) ◽  
pp. 9665-9671
Author(s):  
Sumit Majumder ◽  
Renate Reiter ◽  
Jun Xu ◽  
Günter Reiter
Keyword(s):  
Block Copolymer ◽  
Lamellar Crystals

Block Copolymer Films Hierarchical Assembly in Confinement

2007 ◽  
Vol 364-366 ◽  
pp. 437-441
Author(s):  
Yong Zhi Cao ◽  
Shen Dong ◽  
Ying Chun Liang ◽  
Tao Sun ◽  
Yong Da Yan
Keyword(s):  
Block Copolymer ◽  
Self Assembly ◽  
Structural Control ◽  
Computer Control ◽  
The Self ◽  
Top Down ◽  
Bottom Up ◽  
Dimensional Precision ◽  
Periodic Arrays ◽  
Copolymer Films

Ultrathin block copolymer films are promising candidates for bottom-up nanotemplates in hybrid organic-inorganic electronic, optical, and magnetic devices. Key to many future applications is the long range ordering and precise placement of the phase-separated nanoscale domains. In this paper, a combined top-down/bottom-up hierarchical approach is presented on how to fabricate massive arrays of aligned nanoscale domains by means of the self-assembly of asymmetric poly (styrene-block-ethylene/butylenes-block-styrene) (SEBS) tirblock copolymers in confinement. The periodic arrays of the poly domains were orientated via the introduction of AFM micromachining technique as a tool for locally controlling the self-assembly process of triblock copolymers by the topography of the silicon nitride substrate. Using the controlled movement of 2- dimensional precision stage and the micro pressure force between the tip and the surface by computer control system, an artificial topographic pattern on the substrate can be fabricated precisely. Coupled with solvent annealing technique to direct the assembly of block copolymer, this method provides new routes for fabricating ordered nanostructure. This graphoepitaxial methodology can be exploited in hybrid hard/soft condensed matter systems for a variety of applications. Moreover, Pairing top-down and bottom-up techniques is a promising, and perhaps necessary, bridge between the parallel self-assembly of molecules and the structural control of current technology.

Versatile multicompartment nanoparticles constructed with two thermo-responsive, pH-responsive and hydrolytic diblock copolymers

2017 ◽  
Vol 8 (36) ◽  
pp. 5593-5602 ◽  
Author(s):  
Shengli Chen ◽  
Xueying Chang ◽  
Pingchuan Sun ◽  
Wangqing Zhang
Keyword(s):  
Block Copolymer ◽  
Diblock Copolymers ◽  
Ph Responsive

Multicompartment block copolymer nanoparticles constructed with two smart diblock copolymers are prepared and their versatile morphology upon stimuli is demonstrated.

Polymerization of dopamine accompanying its coupling to induce self-assembly of block copolymer and application in drug delivery

2020 ◽  
Vol 11 (16) ◽  
pp. 2811-2821 ◽  
Author(s):  
Yudian Qiu ◽  
Zongyuan Zhu ◽  
Yalei Miao ◽  
Panke Zhang ◽  
Xu Jia ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Block Copolymer ◽  
Self Assembly ◽  
The Self ◽  
Ordered Structures

The polymerization of dopamine and its coupling occur in succession, which synergistically induces the self-assembly of block copolymer to yield ordered structures, including micelles and vesicles.

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