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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

3.1K
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

2.7K
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...
2.7K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.2K
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...
4.2K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.3K
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...
2.3K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.7K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.7K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.3K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
2.3K

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Boundary-directed epitaxy of block copolymers.

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Directed self-assembly of block copolymers (BCPs) uses surface boundaries to precisely control nanoscale patterns. This method achieves ordered BCP line arrays with 6.4 nm half-pitch for advanced nanofabrication.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Directed self-assembly of block copolymers (BCPs) is crucial for nanofabrication below 10 nm.
  • Conventional lithography faces resolution limits for nanoscale patterning.
  • Controlling BCP domain placement, orientation, and long-range order remains a significant challenge.

Purpose of the Study:

  • To develop a novel method for directing the self-assembly of block copolymers using surface features.
  • To achieve precise control over the position, orientation, and lateral order of BCP domains.
  • To enable nanofabrication of technologically relevant patterns at sub-10 nm scales.

Main Methods:

  • Utilizing spatial boundaries between surface regions of differing composition to direct BCP assembly.
  • Forming pairs of boundaries at the edges of isolated stripes on a background substrate.
  • Leveraging chemical contrast at stripe/substrate boundaries to nucleate and pin vertical lamellae.

Main Results:

  • Vertical lamellae nucleated and aligned parallel to the chemical boundaries.
  • BCP domains selectively propagated into stripe interiors, forming ordered line arrays.
  • Achieved ordered BCP line arrays with a 6.4 nm half-pitch on stripes wider than 80 nm.

Conclusions:

  • Boundary-directed epitaxy offers a robust strategy for controlling BCP self-assembly.
  • This approach facilitates the creation of materials and patterns at sub-10 nm scales.
  • Paves the way for advanced lithographic definition of nanoscale materials.