Effect of heat-treatment on the performance of gas barrier layers applied by atomic layer deposition onto polymer-coated paperboard

Terhi Hirvikorpi, Mika Vähä-Nissi, Jari Vartiainen, Paavo Penttilä, Juha Nikkola, Ali Harlin, Ritva Serimaa, Maarit Karppinen

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

The effect of heat treatment on the gas barrier of the polymer-coated board further coated with an Al2O3 layer by atomic layer deposition (ALD) was studied. Heat treatment below the melting point of the polymer followed by quenching at room temperature was used for the polylactide-coated board [B(PLA)], while over-the-melting-point treatment was utilized for the low-density polyethylene-coated board [B(PE)] followed by quenching at room temperature or in liquid nitrogen. Heat treatment of B(PLA) and B(PE) followed by quenching at room temperature improved the water vapor barrier. However, because of the changes in the polymer morphology, quenching of B(PE) with liquid nitrogen impaired the same barrier. No improvement in oxygen barrier was observed explained by, e.g., the spherulitic structure of PLA and the discontinuities and possible short-chain amorphous material around the spherulites forming passages for oxygen molecules. This work emphasizes the importance of a homogeneous surface prior to the ALD growth Al2O3 barrier layer
Original languageEnglish
Pages (from-to)2221-2227
JournalJournal of Applied Polymer Science
Volume122
Issue number4
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • barrier
  • gas permeation
  • morphology
  • nanolayers
  • thin films

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