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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
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Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Three-Tone Chemical Patterns for Block Copolymer Directed Self-Assembly.

Lance D Williamson1,2, Robert N Seidel1,2, Xuanxuan Chen1

  • 1Institute for Molecular Engineering, University of Chicago , Chicago, Illinois 60637, United States.

ACS Applied Materials & Interfaces
|January 9, 2016
PubMed
Summary

Researchers discovered a new three-tone chemical pattern for directed self-assembly (DSA) of block copolymers (BCP). This advanced pattern guides BCP domain formation more effectively than previous two-tone methods, enabling defect-free assembly.

Keywords:
block copolymerchemical patternchemoepitaxydirected self-assemblysurface modification

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Directed self-assembly (DSA) utilizes chemical patterns to guide block copolymer (BCP) organization.
  • Current methods often employ two-tone chemical patterns for BCP templating.
  • Fabrication of these patterns typically involves resist patterning, etching, and brush grafting.

Purpose of the Study:

  • To investigate the potential of a three-tone chemical pattern for BCP directed self-assembly.
  • To characterize the properties and BCP wetting behavior of the newly discovered three-tone pattern.
  • To evaluate the effectiveness of three-tone patterns in guiding BCP domain formation.

Main Methods:

  • Fabrication of chemical patterns using a 300 mm wafer all-track process.
  • Characterization using Scanning Electron Microscopy (SEM) and Grazing-Incidence Small-Angle X-ray Scattering (GISAXS).
  • Assessment of BCP wetting behavior and DSA performance across various guide stripe widths.

Main Results:

  • A novel three-tone chemical pattern was unexpectedly produced during fabrication.
  • The three-tone pattern features guide stripes, flanking stripes, and a background chemistry.
  • These patterns demonstrated preferential wetting by different BCP blocks, guiding three times more domains than two-tone patterns.

Conclusions:

  • Three-tone chemical patterns offer enhanced control over BCP self-assembly.
  • They provide a stronger driving force for defect-free BCP architectures.
  • This advancement has potential for improved manufacturing processes with larger windows and shorter assembly times.