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Related Concept Videos

Additives and Fillers in Concrete01:29

Additives and Fillers in Concrete

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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.
The...
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Plasticizers01:31

Plasticizers

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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.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
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Pozzolans01:21

Pozzolans

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Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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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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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Zeolite Additives for Flexible Packaging Polymers: Current Status Review and Future Perspectives.

Mattia Fornaro1, Barbara Liguori1,2, Veronica Ambrogi3

  • 1ACLabs-Applied Chemistry Labs, Department of Chemical, Materials and Industrial Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Napoli, Italy.

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Zeolites enhance plastic packaging by improving mechanical and barrier properties. This inorganic additive shows promise for biodegradable polymers, though dispersion challenges remain.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Polyethylene (PE) and polypropylene (PP) are widely used in packaging but lack environmental sustainability.
  • Biodegradable polymers offer eco-friendly alternatives but often have limited mechanical and barrier properties.
  • Zeolites, inorganic materials with unique adsorption and ion-exchange capabilities, are explored as functional additives for polymers.

Purpose of the Study:

  • To review the application of zeolites as additives in flexible plastic packaging.
  • To evaluate the impact of zeolites on the mechanical, barrier, and antimicrobial properties of PE, PP, and biodegradable polymers.
  • To identify challenges and opportunities for using zeolites in advanced packaging materials.

Main Methods:

  • Literature review of studies on zeolite-modified polymer films.
  • Analysis of film preparation techniques and characterization methods.
  • Evaluation of property enhancements, including mechanical strength, gas barrier, thermal stability, and antimicrobial activity.

Main Results:

  • Zeolite addition generally improves gas barrier properties, elastic moduli, and strength in polymer films.
  • Thermal stability is enhanced, while elongation at break shows varied responses depending on the polymer matrix.
  • Zeolites can impart antimicrobial and scavenging activities, leveraging their cation exchange and adsorption properties.

Conclusions:

  • Zeolites are promising additives for enhancing flexible packaging, particularly for biodegradable polymers.
  • Improvements in mechanical and barrier properties, along with potential antimicrobial functions, are significant.
  • Challenges related to zeolite concentration, dispersion, and matrix-additive incompatibility need to be addressed for wider application.