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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Radical Chain-Growth Polymerization: Chain Branching01:17

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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...
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Anionic Chain-Growth Polymerization: Overview01:20

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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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Related Experiment Video

Updated: Jan 1, 2026

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Block copolymers containing stable radical and fluorinated blocks with long-range ordered morphologies prepared by

Alicia Cintora1, Hiroki Takano2, Mohit Khurana1

  • 1Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853, USA.

Polymer Chemistry
|December 20, 2019
PubMed
Summary

We developed a new method for creating stable radical block copolymers with fluorinated blocks using anionic polymerization. This technique allows for controlled polymer properties and ordered microphase morphologies, useful for advanced materials.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Stable radical polymers offer unique electronic and magnetic properties.
  • Block copolymers enable the creation of complex nanostructures through microphase separation.
  • Fluorinated polymers provide desirable surface properties like low surface energy.

Purpose of the Study:

  • To develop a facile synthetic route for stable radical block copolymers incorporating a fluorinated block.
  • To achieve controlled molecular weights and low dispersity for both homopolymers and block copolymers.
  • To investigate the microphase morphology and surface energy of the resulting block copolymers.

Main Methods:

  • Anionic polymerization utilizing a bulky, sterically hindered countercation (sodium ion and di-benzo-18-crown-6 complex).
  • Synthesis of poly(2,2,6,6-tetramethyl-1-piperidinyloxy-methacrylate) (PTMA) and poly(2,2,2-trifluoroethyl methacrylate) (PTFEMA) homopolymers and PTMA-b-PTFEMA block copolymers.
  • Characterization using electron spin resonance (ESR), atomic force microscopy (AFM), grazing incidence small angle X-ray scattering (GISAXS), and Zisman method.

Main Results:

  • Controlled molecular weights and low dispersity (<1.3) were achieved for PTMA, PTFEMA, and PTMA-b-PTFEMA.
  • Polymers exhibited high stable radical content (>70%) as determined by ESR.
  • PTMA-b-PTFEMA thin films displayed long-range ordered lamellar and cylindrical morphologies (32-36 nm spacing) aided by neutral layers, with PTMA surface energy estimated at 30.1 mJ/m².

Conclusions:

  • A robust anionic polymerization method was established for synthesizing stable radical-containing fluorinated block copolymers.
  • The study demonstrates the successful formation of well-defined nanostructures with long-range order.
  • The synthesized block copolymers possess tunable properties and ordered morphologies suitable for advanced material applications.