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Related Concept Videos

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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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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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Enhancing the Directed Self-assembly Kinetics of Block Copolymers Using Binary Solvent Mixtures.

Woon Ik Park1, Young Joong Choi2, Je Moon Yun1

  • 1Global Frontier R&D Center for Hybrid Interface Materials (HIM), Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 609-735, Republic of Korea.

ACS Applied Materials & Interfaces
|October 31, 2015
PubMed
Summary

Binary solvent vapor annealing dramatically speeds up block copolymer (BCP) self-assembly. This breakthrough enables rapid formation of well-ordered nanostructures for advanced nanolithography applications.

Keywords:
binary solvent annealingblock copolymerdirected self-assemblyinteraction parameterself-assembly kinetics

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Block copolymers (BCPs) form ordered nanostructures crucial for nanolithography.
  • Achieving rapid self-assembly in high Flory-Huggins interaction parameter (χ) BCPs is challenging due to slow kinetics.

Purpose of the Study:

  • To develop a method for accelerating the self-assembly kinetics of high-χ BCPs.
  • To demonstrate ultrafast pattern formation for nanolithography.

Main Methods:

  • Utilized a binary solvent vapor annealing technique.
  • Systematically analyzed the effect of solvent mixing ratios (heptane and toluene) on self-assembly.
  • Investigated pattern formation in confined spaces (300 nm-wide trench).

Main Results:

  • Achieved ultrafast self-assembly (≤1 minute) for poly(dimethylsiloxane-b-styrene) (PDMS-b-PS) BCPs.
  • Demonstrated the formation of well-ordered nanostructures.
  • Generated sub-20 nm dot patterns within 10 seconds.

Conclusions:

  • Binary solvent vapor annealing significantly accelerates BCP self-assembly kinetics.
  • This method is effective for high-χ BCPs and applicable to other solvent-based annealing systems.
  • The findings contribute to the realization of next-generation ultrafine lithography.