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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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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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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 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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Radical Chain-Growth Polymerization: Overview01:10

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Grafted polymer chains suppress nanoparticle diffusion in athermal polymer melts.

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Area of Science:

  • Polymer science
  • Materials science
  • Nanotechnology

Background:

  • Diffusion of nanoparticles (NPs) in polymer melts is crucial for material properties.
  • The Stokes-Einstein relation often overestimates NP diffusion in polymer matrices.
  • Understanding NP-polymer interactions is key to controlling material behavior.

Purpose of the Study:

  • To measure the diffusion of poly(methyl methacrylate) (PMMA)-grafted NPs in PMMA melts.
  • To compare experimental diffusion rates with theoretical predictions.
  • To elucidate the role of grafted polymer chains on NP diffusion.

Main Methods:

  • Rutherford backscattering spectrometry was used to track center-of-mass diffusion.
  • Experiments were conducted in unentangled to slightly entangled PMMA melts.
  • Results were compared with Stokes-Einstein relation and dynamic mean field simulations.

Main Results:

  • Grafted NPs diffused approximately 100 times slower than predicted by Stokes-Einstein.
  • An increased effective NP size (2Reff ≈ 20 nm) was observed.
  • This effective size matched the NP core plus extended grafted chains.

Conclusions:

  • Grafted polymer chains significantly increase the effective size of nanoparticles.
  • This increased size is the primary reason for the reduced NP diffusion in polymer melts.
  • Findings suggest a modification to NP diffusion mechanisms in polymer melts due to grafted chains.