Polyvinyl Alcohol and Nano-Clay Based Solution Processed Packaging Coatings

Cost-effective, clean, highly transparent, and flexible as well as a coatable packaging material is envisioned to solve or at least mitigate quality preservation issues of organic materials, originating from moisture interaction under ambient conditions. Liquid phase processing of packaging coatings using nano-clay and polyvinyl alcohol (PVOH) has been developed and reported. Detailed analysis of the developed coating revealed moisture permeability of 2.8 x 10(-2) g center dot cm/m(2)center dot day at 40 degrees C and 85% relative humidity (RH), which is in close accordance with Bharadwaj's theoretical permeability model. Moreover, the developed coatings are not only more than 90% transparent, when exposed to white light, but also exhibit excellent flexibility and even after going through 10,000 bending cycles maintained the same blocking effect against moisture.

Automated summary

The newly developed packaging coatings demonstrate high transparency and excellent flexibility, maintaining a strong barrier effect against moisture even after 10,000 bending cycles, effectively reducing moisture-related issues for organic materials under ambient conditions.