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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

3.0K
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...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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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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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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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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Dynamical crossover between hyperdiffusion and subdiffusion of polymer-grafted nanoparticles in a polymer matrix.

Taiki Hoshino1, Daiki Murakami, Yoshihito Tanaka

  • 1ERATO Takahara Soft Interfaces Project, Japan Science and Technology Agency, CE80, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan and RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
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Polystyrene nanoparticles in a polymer matrix show non-Brownian movement. Above 1.25 times the glass transition temperature (Tg), their diffusion shifts from hyperdiffusion to subdiffusion due to matrix interactions.

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Area of Science:

  • Polymer science
  • Materials science
  • Nanotechnology

Background:

  • Studying nanoparticle dynamics in polymer matrices is crucial for understanding material properties.
  • Polystyrene-grafted silica nanoparticles offer a model system for investigating polymer-nanoparticle interactions.

Purpose of the Study:

  • To investigate the dynamical behavior of polystyrene-grafted silica nanoparticles within an atactic polystyrene matrix.
  • To determine how temperature influences nanoparticle diffusion and dynamics relative to the matrix glass transition temperature (Tg).

Main Methods:

  • Utilized X-ray Photon Correlation Spectroscopy (XPCS) to probe nanoparticle dynamics.
  • Applied continuous-time random walk (CTRW) models for fitting time-autocorrelation functions.

Main Results:

  • Nanoparticles exhibited non-Brownian dynamical behavior.
  • A transition from hyperdiffusion to subdiffusion was observed at 1.25Tg.
  • Hyperdiffusion is linked to the dynamical heterogeneity of the polymer matrix near Tg.
  • Above 1.25Tg, significant grafted polymer-matrix interactions altered nanoparticle dynamics.

Conclusions:

  • Nanoparticle dynamics are strongly influenced by the polymer matrix's viscoelastic properties and heterogeneity.
  • The temperature-dependent transition in diffusion behavior highlights the importance of the glass transition in polymer nanocomposites.
  • Grafted polymer-matrix interactions play a critical role in dictating nanoparticle mobility at elevated temperatures.