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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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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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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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Step-Growth Polymerization: Overview01:03

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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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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Updated: Dec 29, 2025

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Commensurability-Driven Orientation Control during Block Copolymer Directed Self-Assembly.

Hyun Su Yun1, Hyung Wan Do2, Karl K Berggren3

  • 1Division of Advanced Materials Engineering, Kongju National University, Cheonan 31080, Republic of Korea.

ACS Applied Materials & Interfaces
|February 7, 2020
PubMed
Summary
This summary is machine-generated.

Researchers controlled block copolymer (BCP) pattern orientation using topographical templates with specific dimensions. This method allows programming BCP patterns into desired layouts by adjusting template wall thickness.

Keywords:
block copolymersdirected self-assemblygraphoepitaxynanolithographynanopatterns

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Block copolymers (BCP) self-assembly is crucial for creating nanoscale patterns.
  • Controlling the orientation of BCP patterns is essential for device fabrication.
  • Topographical templates offer a method for guiding BCP self-assembly.

Purpose of the Study:

  • To develop a simple design rule for controlling block copolymer pattern orientation within topographical templates.
  • To demonstrate the programming of binary states of BCP patterns into desired layouts.

Main Methods:

  • Utilizing topographical templates with one commensurate and one incommensurate dimension to dictate BCP orientation.
  • Tuning the template wall thickness to program the BCP pattern layout.

Main Results:

  • Successful control over block copolymer pattern orientation was achieved.
  • A template design rule based on dimensional commensurability was established.
  • The ability to program binary states of BCP patterns was demonstrated by adjusting template wall thickness.

Conclusions:

  • A straightforward method for orienting block copolymer patterns using topographical templates has been developed.
  • This technique enables the precise programming of BCP patterns for advanced material applications.
  • The findings offer a new approach for fabricating complex nanostructures.