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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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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 catalyst, high molecular...
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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 acceptor.
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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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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 the...
Cationic Chain-Growth Polymerization: Mechanism00:57

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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 generated carbocation,...
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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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Molecular Entanglement and Electrospinnability of Biopolymers
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Multi-chain slip-spring model for entangled polymer dynamics.

Takashi Uneyama1, Yuichi Masubuchi

  • 1School of Natural System, College of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan. uneyama@se.kanazawa-u.ac.jp

The Journal of Chemical Physics
|October 23, 2012
PubMed
Summary
This summary is machine-generated.

We introduce a multi-chain slip-spring model to simulate polymer entanglement dynamics. This model bridges single-chain theories and multi-chain simulations, accurately predicting polymer behavior across different entanglement regimes.

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Area of Science:

  • Polymer Physics
  • Computational Materials Science
  • Soft Matter Physics

Background:

  • Single-chain models like tube and slip-link models describe entangled polymer dynamics.
  • A clear link between single-chain models and multi-chain systems remains underdeveloped.
  • Entanglement effects in polymers arise from hard-core interactions between chains.

Purpose of the Study:

  • To propose a novel multi-chain slip-spring model for simulating polymer entanglement.
  • To bridge the gap between single-chain theoretical models and complex multi-chain systems.
  • To establish a simulation framework that captures polymer dynamics influenced by entanglements.

Main Methods:

  • Developed a multi-chain slip-spring model using bead-spring chains connected by slip-springs.
  • Defined state variables including bead positions and slip-spring connectivity.
  • Formulated dynamics via time evolution and stochastic transition equations, ensuring free energy and detailed balance.
  • Incorporated repulsive bead interactions to counteract slip-spring induced attractions.

Main Results:

  • The model successfully reproduces the expected dependence on bead number in the transition between Rouse and entangled dynamics.
  • Simulations accurately predict chain structure, central bead diffusion, and linear relaxation modulus.
  • The model provides a computationally tractable approach to multi-chain polymer entanglement.

Conclusions:

  • The proposed multi-chain slip-spring model offers a robust framework for studying entangled polymer dynamics.
  • This model effectively links single-chain concepts with multi-chain simulation realities.
  • The findings pave the way for more accurate predictions of polymer material properties.