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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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Polymers: Molecular Weight Distribution01:10

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Radical Chain-Growth Polymerization: Chain Branching01:17

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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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Polymer Classification: Architecture01:14

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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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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Anionic Chain-Growth Polymerization: Overview01:20

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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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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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Temperature orthogonal dynamic polymer networks.

Matthias Udo Mayer-Kriehuber1,2, Evelyn Sattler1, David Reisinger1,2

  • 1Polymer Competence Center Leoben GmbH Sauraugasse 1 A-8700 Leoben Austria sandra.schloegl@pccl.at sandra.schloegl@unileoben.ac.at.

Chemical Science
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Summary
This summary is machine-generated.

Latent catalysts in covalent adaptable polymer networks (CANs) enable rapid reprocessing. This study introduces dual thermolatent catalysts for independent, temperature-controlled switching, allowing programmable material properties for advanced manufacturing.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Covalent adaptable polymer networks (CANs) offer dynamic properties for reprocessing.
  • Latent catalysts, particularly thermolatent ones, are crucial for controlled network activation.
  • Existing thermolatent systems often lack independent control over activation and deactivation temperatures.

Purpose of the Study:

  • To systematically investigate thermobase generators (TBGs) with distinct temperature profiles.
  • To quantitatively assess the impact of catalyst activation/deactivation on stress relaxation in dynamic thiol-ene photopolymers.
  • To develop and demonstrate temperature-orthogonal catalysis within a single CAN system.

Main Methods:

  • Synthesis and characterization of cyanoacetate- and oxalate-based TBGs.
  • Quantitative stress relaxation measurements on dynamic thiol-ene photopolymers.
  • Combination of TBGs with non-overlapping thermal profiles for orthogonal catalysis.
  • Fabrication of multi-reshapable objects using digital light processing 3D printing.

Main Results:

  • Distinct activation and deactivation temperatures were achieved for cyanoacetate- and oxalate-based TBGs.
  • Independent operation of two catalysts enabled four distinct bond-exchange regimes controlled solely by temperature.
  • Demonstrated reversible, multi-cycle switching of material properties.
  • Successfully fabricated multi-reshapable 3D printed components.

Conclusions:

  • Temperature-orthogonal catalysis using dual latent catalysts is feasible in CANs.
  • This approach decouples material stability from reprocessing requirements.
  • Offers a versatile platform for applications needing programmable mechanical response, including soft robotics and switchable adhesives.