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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
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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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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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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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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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Photochemical Chain Scissions Enhance Polyethylene Glycol Biodegradability: from Probabilistic Modeling to

Kevin Kleemann1, Madalina Jaggi2, Stefano M Bernasconi2

  • 1Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich 8092, Switzerland.

Environmental Science & Technology
|August 15, 2025
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Summary

Polyethylene glycols (PEGs) react with hydroxyl radicals, reducing their molecular weight. This degradation enhances PEG biodegradability in soil and sediment environments.

Keywords:
biodegradabilitychain scissionenvironmental fatehydroxyl radicalsmolecular weight distributionphotochemical degradationpolyethylene glycol (PEG)sedimentsoil

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Area of Science:

  • Environmental Chemistry
  • Polymer Science
  • Environmental Microbiology

Background:

  • Polyethylene glycols (PEGs) are widely used water-soluble polymers (WSPs) with potential environmental release.
  • Understanding PEG environmental fate and biodegradability is crucial due to their prevalence.

Purpose of the Study:

  • Investigate the impact of hydroxyl radical (•OH) reaction on PEG molecular weight distribution.
  • Assess the subsequent biodegradation of •OH-modified PEGs in soil and sediment.

Main Methods:

  • Monte Carlo simulations to model PEG chain scission by •OH radicals.
  • Experimental reaction of 13C-labeled PEGs with photochemically produced •OH.
  • Biodegradation assays of unreacted and reacted PEGs in soil and sediment over 150 days, measuring 13CO2 evolution.

Main Results:

  • Simulations showed significant PEG molecular weight reduction after few •OH-induced chain scissions.
  • Experimental validation confirmed decreased PEG molecular weight and formation of low MW products.
  • Biodegradation rates and extents increased with •OH reaction extent, correlating with higher low MW PEG amounts.

Conclusions:

  • Hydroxyl radical reactions significantly alter PEG molecular weight distribution.
  • Lower molecular weight PEGs exhibit enhanced biodegradation rates and extents in soil and sediment.
  • WSP molecular weight dynamics are critical for understanding environmental fate and biodegradability.