Nanocellulose and polylactic acid based multilayer coatings for barrier applications, 19PaperCon
About 20% of the 1.3 billion tons of municipal solid waste that is generated annually around the world is food packaging, a majority of which ends up in landfills or the oceans (Davis and Song 2006, Jambeck et al. 2015). This poses an urgent need to replace packaging that contains non-biodegradable, fossil- fuel based plastics with bio-based and biodegradable alternates. Nanocellulose, in recent years has been gaining interest as a promising biomaterial for packaging applications (Li et al. 2015). Nanocellulose based films and coatings exhibit excellent barrier against Oxygen, grease and mineral oils (Aulin et al. 2010, Gicquel et al. 2017, Kumar et al. 2014, Lavoine et al. 2014, Shimizu et al. 2016). However, it is extremely sensitive to moisture, with most of the barrier properties degrading, if not, disappearing completely when the relative humidity approaches 90% (Spence et al. 2011). Also, nanocellulose’s high viscosity and yield stress at low solids content of just 3% (Nazari et al. 2016), and poor adhesion to various substrates (Kumar et al. 2017) pose additional challenges during high-speed processing.
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Nanocellulose and polylactic acid based multilayer coatings for barrier applications, 19PaperCon