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Step-Growth Polymerization: Overview01:03

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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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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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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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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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Molecular Weight of Step-Growth Polymers01:08

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Anionic Chain-Growth Polymerization: Mechanism01:04

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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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Gradient Polymerization-Induced Self-Assembly: A One-Step Approach.

Sihao Xu1, Tong Zhang1, Rhiannon P Kuchel2

  • 1Centre for Advanced Macromolecular Design and Australian Centre for NanoMedicine, School of Chemical Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia.

Macromolecular Rapid Communications
|November 12, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel one-pot method for creating self-assembled nanoparticles using polymerization-induced self-assembly (PISA). This efficient single-step process synthesizes gradient copolymers, improving reproducibility for nanoparticle synthesis.

Keywords:
gradient copolymersphoto-induced electron/energy transfer-reversible additon-fragmentation chain transfer polymerization (PET-RAFT)reactivity-driven gradient copolymerssingle-step polymerization induced self-assembly (PISA)

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Conventional nanoparticle synthesis often requires multi-step processes with pre-formed stabilizers.
  • Polymerization-induced self-assembly (PISA) offers a more direct route to nanostructures.
  • Controlling copolymer composition and architecture is key to achieving desired self-assembled morphologies.

Purpose of the Study:

  • To develop a novel, efficient single-step, one-pot method for synthesizing self-assembled nanoparticles.
  • To utilize the disparate reactivities of monomers in a gradient copolymerization for in situ self-assembly.
  • To explore the formation of different nanoparticle morphologies, including spheres and worms, via PISA.

Main Methods:

  • Employed a single-step, one-pot polymerization-induced self-assembly (PISA) approach.
  • Utilized two monomers: oligo(ethylene glycol) methyl ether methacrylate (OEGMA) and diacetone acrylamide (DAAm), exploiting their differential reactivities.
  • Synthesized gradient copolymers directly in aqueous solution, leading to in situ self-assembly.

Main Results:

  • Successfully synthesized self-assembled nanoparticles (spheres and worms) in a single step.
  • Demonstrated that gradient copolymers self-assemble in situ due to the hydrophobic poly(DAAm) and hydrophilic OEGMA segments.
  • Identified a broad parameter range for stabilizing worm morphology, evidenced by in situ gelation.
  • Achieved improved reproducibility compared to conventional multi-step syntheses.

Conclusions:

  • The single-step gradient copolymerization PISA approach is more efficient than traditional multi-step methods.
  • This one-pot synthesis directly yields self-assembled nanoparticles, enhancing reproducibility.
  • The method provides a versatile platform for creating well-defined nanostructures with tunable morphologies.