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Related Concept Videos

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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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 generated carbocation,...

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"Click-functional" block copolymers provide precise surface functionality via spin coating.

Hernán R Rengifo1, Lu Chen, Cristian Grigoras

  • 1Department of Chemical Engineering, Columbia University, 500 West 120th Street, MC4721, New York, New York 10027, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 19, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for precisely functionalizing surfaces using alkyne end-functional diblock copolymers. This technique enables controlled surface modification for various applications, including creating fluorescent microarrays.

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Area of Science:

  • Polymer Science
  • Surface Chemistry
  • Materials Science

Background:

  • Quantitative surface functionalization methods are limited, particularly for polymeric materials.
  • Alkyne end-functional diblock copolymers offer a versatile platform for surface modification.

Purpose of the Study:

  • To demonstrate the use of alkyne end-functional diblock copolymers for precise surface functionalization on hard and soft substrates.
  • To control the areal density of reactive alkyne groups on surfaces.
  • To showcase the utility of these functionalized surfaces via click chemistry.

Main Methods:

  • Spin-coating of alpha-alkyne-omega-Br-poly(tert-butylacrylate-b-methylmethacrylate) (poly(tBA-MMA)) diblock copolymers.
  • Self-assembly of copolymer films to form surface monolayers.
  • Surface modification using Sharpless click chemistry with azide-functional molecules.
  • Characterization using atomic force microscopy (AFM), contact angle, ellipsometry, fluorescent imaging, and angle-dependent X-ray photoelectron spectroscopy (ADXPS).

Main Results:

  • Precise control over the areal density of alkyne functionality was achieved by adjusting spin-coating parameters or copolymer molecular weight.
  • Successful covalent immobilization of fluorescently labeled azides onto alkyne-functionalized surfaces was demonstrated.
  • Microarrays of covalently bound fluorescent molecules were created and evaluated for signal-to-noise ratios.

Conclusions:

  • Alkyne end-functional diblock copolymers provide a versatile and controllable method for quantitative surface functionalization.
  • The developed approach is applicable to both hard and soft substrates.
  • This technique enables the creation of functional surfaces for applications such as biosensing and microarrays.