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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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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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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...
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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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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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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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Bottlebrush Amphiphilic Polymer Co-Networks.

Brandon R Clarke1, Gregory N Tew1

  • 1Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States.

Macromolecules
|July 24, 2023
PubMed
Summary

Researchers synthesized novel amphiphilic polymer co-networks (B-APCNs) using poly(ethylene glycol) (PEG) and poly(dimethyl siloxane) (PDMS). Tuning PEG content suppressed crystallinity, altering network moduli for potential new material applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Amphiphilic polymer co-networks (APCNs) are crucial for various applications, but their architectures are often limited.
  • Controlling the physical properties of APCNs, such as crystallinity and mechanical modulus, is essential for tailored performance.
  • Bottlebrush polymer architectures offer unique properties due to their dense, extended side chains.

Purpose of the Study:

  • To synthesize novel poly(ethylene glycol) (PEG) and poly(dimethyl siloxane) (PDMS) bottlebrush amphiphilic polymer co-networks (B-APCNs).
  • To investigate the effect of PEG volume fraction on the crystallinity and mechanical properties of these B-APCNs.
  • To explore a new class of materials with tunable properties based on bottlebrush architecture.

Main Methods:

  • Grafting-through ring-opening metathesis polymerization (ROMP) was employed for B-APCN synthesis.
  • Varying PEG volume fraction to control network crystallinity.
  • Dynamic mechanical analysis (DMA) was used to characterize storage and loss moduli.

Main Results:

  • Novel B-APCNs with high gel fractions were successfully synthesized.
  • PEG crystallinity was completely suppressed at a specific PEG volume fraction ().
  • Network moduli were tunable by controlling crystallinity; suppressed crystallinity networks mimicked PDMS homopolymer bottlebrush networks.

Conclusions:

  • Bottlebrush amphiphilic polymer co-networks (B-APCNs) offer a new, unexplored architecture in polymer science.
  • The synthesis method allows for precise control over PEG crystallinity and mechanical properties.
  • These tunable B-APCNs hold promise for advanced material applications requiring specific mechanical responses.