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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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Superplasticizers01:30

Superplasticizers

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Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Additives and fillers are integral to enhancing the properties of concrete. Pozzolans and blast-furnace slag are additives or admixtures due to their reactions with calcium hydroxide released during cement hydration. Fillers, which are finely ground and similar in fineness to Portland cement, improve concrete attributes such as workability density, and reduce capillary bleeding or cracking. Some fillers possess hydraulic properties or participate in benign reactions within the cement paste.
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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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 Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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Recycling of Post-Consumer Waste Polystyrene Using Commercial Plastic Additives.

Sewon Oh1, Hanning Jiang2, Liat H Kugelmass1

  • 1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14850, United States.

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Summary
This summary is machine-generated.

Black plastic recycling is now possible using visible light and carbon black pigment for efficient depolymerization into styrene monomers. This method enables closed-loop recycling for all colored polystyrene plastics.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Polymer Chemistry

Background:

  • Photothermal conversion offers a promising route for plastic depolymerization, enabling chemical recycling via light-to-heat conversion.
  • Localized heating near photothermal agents allows for selective plastic degradation, a key advantage over bulk pyrolysis.
  • Practical photothermal agents for end-of-life plastic recycling remain a challenge, limiting widespread adoption.

Purpose of the Study:

  • To investigate the use of carbon black pigment in polystyrene as a photothermal agent for efficient plastic depolymerization.
  • To demonstrate the feasibility of visible light-driven recycling of black polystyrene into styrene monomers.
  • To explore the potential for a closed-loop recycling system for all colored polystyrene plastics.

Main Methods:

  • Synthesized polystyrene-carbon black composites for model system evaluation.
  • Irradiated composites with white LED light to induce depolymerization.
  • Tested unmodified postconsumer black polystyrene samples under visible light and focused solar irradiation.
  • Investigated the depolymerization of mixed polystyrene plastics containing black polystyrene.

Main Results:

  • Achieved up to 60% yield of styrene monomer from synthesized polystyrene-carbon black composites using LED irradiation.
  • Successfully depolymerized unmodified postconsumer black polystyrene into styrene monomer without catalysts or solvents.
  • Observed yields up to 80% within 5 minutes using focused solar irradiation.
  • Demonstrated complete depolymerization of mixed polystyrene types by including a small percentage of black polystyrene.

Conclusions:

  • Carbon black in commercial black plastics serves as an effective photothermal agent for polystyrene depolymerization using visible light.
  • This method offers a simple, catalyst- and solvent-free approach to chemical recycling of polystyrene.
  • The technology paves the way for a closed-loop economy for all colored polystyrene plastics by leveraging existing additives.