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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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Cyclic block copolymers for controlling feature sizes in block copolymer lithography.

Justin E Poelma1, Kosuke Ono, Daigo Miyajima

  • 1Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA.

ACS Nano
|December 1, 2012
PubMed
Summary

Macromolecular architecture, specifically cyclic block polymers, offers a novel method to control feature sizes in block copolymer lithography. This approach reduces domain spacing by approximately 30% compared to linear polymers.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Block copolymer lithography is crucial for achieving sub-20 nm feature sizes in semiconductor manufacturing.
  • Traditional methods for controlling feature size rely on molecular weight and block immiscibility.
  • The potential of macromolecular architecture for tuning domain spacing remains underexplored.

Purpose of the Study:

  • To investigate macromolecular architecture as a tool for tuning domain spacing in block copolymer lithography.
  • To develop a synthetic strategy for cyclic block polymers.
  • To compare the self-assembly behavior of cyclic and linear block copolymers.

Main Methods:

  • Development of a novel synthetic strategy using "click" coupling for cyclic block polymers.
  • Synthesis of cyclic polystyrene-block-polyethylene oxide (cPS-b-PEO).
  • Comparison of thin film self-assembly of cPS-b-PEO with linear analogues.

Main Results:

  • Successful synthesis of cyclic block polymers via efficient "click" coupling.
  • Cyclic block polymers exhibit reduced hydrodynamic radii compared to linear counterparts.
  • A ~30% decrease in domain spacing was observed for cyclic systems versus linear polymers.

Conclusions:

  • Macromolecular architecture, particularly cyclic structures, is a powerful parameter for controlling domain spacing in block copolymer self-assembly.
  • Cyclic block polymers offer a promising route to achieving smaller feature sizes for next-generation semiconductor lithography.
  • This study establishes a new synthetic pathway and demonstrates the significant impact of cyclic architecture on nanostructure dimensions.