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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Related Experiment Video

Updated: Jan 26, 2026

Capsular Serotyping of Streptococcus pneumoniae by Latex Agglutination
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Polylactide/Montmorillonite Hybrid Latex as a Barrier Coating for Paper Applications.

Davide Bandera1,2, Veronika R Meyer3, David Prevost4

  • 1Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Applied Wood Materials, Überlandstrassse 129, CH-8600 Dübendorf, Switzerland. dav.bande@gmail.com.

Polymers
|April 14, 2019
PubMed
Summary

A new paper coating using polylactide and montmorillonite offers improved water resistance for food packaging. This eco-friendly, non-toxic coating enhances barrier properties, making it suitable for safe food applications.

Keywords:
food packaginghybrid latexpaper coatingpolylactide/montmorillonite hybrid coatingwater vapor transmission ratewater-based coating latex

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Area of Science:

  • Materials Science
  • Polymer Science
  • Food Science

Background:

  • Conventional food packaging materials often lack sufficient barrier properties against moisture.
  • Developing sustainable and safe packaging solutions is crucial for the food industry.
  • Polylactide (PLA) and montmorillonite (MMT) are promising materials for advanced packaging applications.

Purpose of the Study:

  • To develop and characterize a novel paper coating for food packaging applications.
  • To enhance the water vapor barrier properties of paper substrates.
  • To ensure the safety and sustainability of the developed coating.

Main Methods:

  • Preparation of a stable, water-based latex containing polylactide, montmorillonite, surfactants, and a plasticizer via emulsion/solvent evaporation.
  • Application of the latex coating to paper using bar-coating.
  • Hot-pressing the coated paper at 150 °C.
  • Evaluation of water vapor transmission rates (WVTR) of the coated paper.

Main Results:

  • The developed paper coating significantly improved water vapor transmission rates by up to 85% compared to uncoated paper.
  • The coating latex was prepared using inexpensive and non-toxic ingredients.
  • The coating process is solvent-free, contributing to environmental sustainability.
  • The resulting coated papers are suitable for safe food packaging.

Conclusions:

  • A cost-effective and environmentally friendly paper coating based on polylactide and montmorillonite was successfully developed.
  • The coating effectively enhances the moisture barrier properties of paper, making it suitable for food packaging.
  • The non-toxic nature of the coating ensures its safety for direct food contact applications.