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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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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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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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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.
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Polymers02:34

Polymers

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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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"Graft-to" Protein/Polymer Conjugates Using Polynorbornene Block Copolymers.

Sergey A Isarov1, Parker W Lee1, Jonathan K Pokorski1

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Researchers developed a new method to attach polymers to proteins using Ring-Opening Metathesis Polymerization (ROMP). This creates novel bioconjugates with potential applications in nanomedicine without harming cells.

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Area of Science:

  • Polymer Chemistry
  • Bioconjugation
  • Nanomedicine

Background:

  • Protein modification is crucial for developing advanced biomaterials.
  • Conventional methods can be limited in control and scope.
  • Novel bioconjugation strategies are needed to expand the toolbox for protein modification.

Purpose of the Study:

  • To develop a versatile method for creating protein-polymer bioconjugates using Ring-Opening Metathesis Polymerization (ROMP).
  • To synthesize water-soluble polynorbornene block copolymers with controlled molecular weight and architecture.
  • To demonstrate the attachment of these polymers to proteins, including viral nanoparticles, and assess their biocompatibility.

Main Methods:

  • Synthesis of water-soluble polynorbornene block copolymers via ROMP.
  • Grafting of polymers to proteins, specifically targeting lysine residues.
  • Modification of bacteriophage Qβ viral nanoparticles with the synthesized polymers.
  • Cytotoxicity assessment of the resulting bioconjugates using NIH 3T3 murine fibroblast cells.

Main Results:

  • ROMP enabled precise control over polymer molecular weight and architecture, yielding low-dispersity polymers.
  • A reactive anhydride cap facilitated efficient protein conjugation under mild conditions.
  • Multivalent polynorbornene-modified viral nanoparticles were successfully synthesized.
  • The resulting bioconjugates exhibited no cytotoxicity, indicating good biocompatibility.

Conclusions:

  • Protein bioconjugation with functionalized polynorbornenes is an effective alternative to traditional modification strategies.
  • This approach offers a versatile and controllable method for creating novel protein-polymer constructs.
  • The developed technique expands the possibilities for designing advanced protein bioconjugates for nanomedicine and other applications.