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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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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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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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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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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...
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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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Three-Dimensional Visualization for Early-Stage Evolution of Polymer Aging.

Zekun Zhang1, Rui Tian1, Pudun Zhang1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

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Summary
This summary is machine-generated.

This study introduces a novel 3D early-stage visualization technique for polymer aging, detecting initial degradation in polypropylene within 20 minutes. This advanced method offers unprecedented insight into material aging processes.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Analytical Chemistry

Background:

  • Polymer aging monitoring is crucial for predicting material failure and preventing accidents.
  • Current methods offer limited insight, providing only macroscopic, statistical data on polymer degradation.
  • Early-stage aging detection remains a significant challenge in polymer science.

Purpose of the Study:

  • To develop a novel three-dimensional early-stage visualization (ESV) technique for monitoring polymer aging.
  • To enable the detection of initial polymer aging at a significantly earlier stage than conventional methods.
  • To elucidate the three-dimensional evolution of early-stage polymer aging.

Main Methods:

  • Utilized fluorophore-bonded boronic acid to target aging-induced hydroxyl groups via B-O click reaction.
  • Developed a three-dimensional early-stage visualization (ESV) technique for polymer aging.
  • Applied the technique to polypropylene (PP) films for degradation monitoring.

Main Results:

  • The ESV technique detected initial polypropylene aging within 20.0 minutes.
  • Conventional infrared spectroscopy failed to detect aging signals even after 21 days of thermal treatment.
  • Demonstrated anisotropic aging in PP films, with horizontal degradation (4.1 × 10⁻⁴ s⁻¹) significantly faster than vertical degradation (2.6 × 10⁻⁹ m s⁻¹).

Conclusions:

  • The developed 3D ESV technique provides unprecedented sensitivity for early-stage polymer aging detection.
  • The method offers valuable mechanistic insights into polymer aging at a three-dimensional scale.
  • This approach can aid in assessing the effectiveness of advanced anti-aging materials and predicting material lifespan.