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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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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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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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Functionalized Polymersomes from a Polyisoprene-Activated Polyacrylamide Precursor.

Jay R Werber1, Colin Peterson1, Nicholas J Van Zee1

  • 1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 28, 2020
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Summary
This summary is machine-generated.

Researchers developed a new method to create tailored polymer nanoparticles for biomedical uses. This precursor approach modifies polymers to form novel structures and self-assembled polymersomes for various applications.

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Area of Science:

  • Polymer Chemistry
  • Nanotechnology
  • Materials Science

Background:

  • Tailored polymer chemistries are crucial for self-assembled polymer nanoparticles.
  • Existing methods may have limitations in creating diverse polymer structures.

Purpose of the Study:

  • To demonstrate a precursor approach for synthesizing new polymer structures.
  • To create novel amphiphilic block polymers and their self-assembled nanostructures.
  • To enable facile functionalization of these nanostructures.

Main Methods:

  • Synthesis and characterization of poly(isoprene)-block-poly(di-Boc acrylamide) diblock polymers.
  • Postpolymerization modification of the activated-acrylamide block with amines or reductants.
  • Self-assembly of resulting amphiphilic block polymers in water.
  • Characterization of polymersomes using cryo-electron microscopy and confocal microscopy.
  • Functionalization with an amino-fluorophore for imaging.

Main Results:

  • Successfully synthesized amphiphilic block polymers.
  • Demonstrated catalyst-free modification of polymers.
  • Confirmed self-assembly into polymersomes via microscopy.
  • Showcased simple ligand functionalization for imaging.

Conclusions:

  • The precursor approach provides a versatile route to new polymer structures.
  • Methodologies enable creation of tunable solution nanostructures.
  • This work opens avenues for optimized surface chemistries in nanostructures for diverse applications.