Clay-chitosan nanobrick walls: completely renewable gas barrier and flame-retardant nanocoatings

ACS Applied Materials & Interfaces
Galina LauferJaime C Grunlan

Abstract

Thin films prepared via a layer-by-layer (LbL) assembly of renewable materials exhibit exceptional oxygen barrier and flame-retardant properties. Positively charged chitosan (CH), at two different pH levels (pH 3 and pH 6), was paired with anionic montmorillonite (MMT) clay nanoplatelets. Thin-film assemblies prepared with CH at high pH are thicker, because if the low polymer charge density. A 30-bilayer (CH pH 6-MMT) nanocoating (~100 nm thick) reduces the oxygen permeability of a 0.5-mm-thick polylactic acid film by four orders of magnitude. This same coating system completely stops the melting of a flexible polyurethane foam, when exposed to direct flame from a butane torch, with just 10 bilayers (~30 nm thick). Cone calorimetry confirms that this coated foam exhibited a reduced peak heat-release rate, by as much as 52%, relative to the uncoated control. These environmentally benign nanocoatings could prove beneficial for new types of food packaging or a replacement for environmentally persistent antiflammable compounds.

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Citations

Jun 1, 2012·ACS Applied Materials & Interfaces·Gerald FindenigVolker Ribitsch
Jul 11, 2013·ACS Applied Materials & Interfaces·Houssine SehaquiLars A Berglund
Sep 26, 2013·ACS Applied Materials & Interfaces·Ju-Won JeonJodie L Lutkenhaus
Dec 10, 2015·Journal of Occupational and Environmental Hygiene·Yeon Seok KimSavelas A Rabb
Oct 13, 2015·ACS Applied Materials & Interfaces·Oruç KöklükayaLars Wågberg
Apr 5, 2014·Macromolecular Rapid Communications·Kevin M HolderJaime C Grunlan
Mar 25, 2015·Macromolecular Rapid Communications·Morgan A PrioloJaime C Grunlan
Feb 28, 2015·ACS Applied Materials & Interfaces·F CarosioL Berglund
May 16, 2015·ACS Applied Materials & Interfaces·F CarosioS Bourbigot
Jun 10, 2015·ACS Applied Materials & Interfaces·Jason R KovacsPaula T Hammond
Apr 23, 2015·ACS Applied Materials & Interfaces·Thomas Mayer-GallKlaus Opwis
Apr 27, 2013·Carbohydrate Polymers·Galina LauferJaime C Grunlan
Jan 21, 2015·Nature Communications·Paramita DasAndreas Walther
Dec 4, 2014·ACS Nano·Sahadevan RajeshWilliam A Phillip
Nov 28, 2013·ACS Applied Materials & Interfaces·Fangming XiangJaime C Grunlan
Jun 11, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Tyler GuinJaime C Grunlan
Jun 27, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Gerald FindenigVolker Ribitsch
Jan 16, 2014·ACS Applied Materials & Interfaces·Yeon Seok KimRick D Davis
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May 30, 2020·Polymers·Olga ZilkeJochen Stefan Gutmann
Sep 10, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Giulio Malucelli

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