A novel methodology for controlled migration of antifog from thin polyolefin films

Transparent plastic films are widely used in agriculture as greenhouses covering and in the food industry as packaging films. The films are usually prepared by hydrophobic low polarity thermoplastics such as polyethylene (PE). In a greenhouse, the temperature and humidity are usually higher than the...

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Bibliographic Details
Published in:Polymer engineering and science 2014-09, Vol.54 (9), p.2023-2028
Main Authors: Rosen-Kligvasser, Jasmine, Suckeveriene, Ran Y., Tchoudakov, Roza, Narkis, Moshe
Format: Article
Language:English
Subjects:
Applied sciences
Composites
Compounding ingredients
Droplets
Exact sciences and technology
Food processing industry
Forms of application and semi-finished materials
Glycerides
Grafting
Greenhouses
Lipids
Methods
Migration
Miscellaneous
Molecules
Pharmaceutical industry
Polyethylene
Polyethylene films
Polyethylenes
Polymer industry, paints, wood
Solvent extraction
Surface active agents
Technology of polymers
Thermoplastics
Thin films
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Summary:Transparent plastic films are widely used in agriculture as greenhouses covering and in the food industry as packaging films. The films are usually prepared by hydrophobic low polarity thermoplastics such as polyethylene (PE). In a greenhouse, the temperature and humidity are usually higher than the outside temperature and fog will appear on the inner surface of the PE film. Anti‐fogging (AF) additives are tensoactive materials, mainly nonionic surfactants, equalizing the PE and water surface tensions, thus creating a thin, continuous film of water rather than discrete droplets. In the present work, a new method of controlled migration of AF is described, by grafting AF molecules to the surface of submicron inorganic particles. Glycerides and fatty acids are used as AF. During the grafting reaction two fractions are formed: attached AF fraction to the inorganic particles' surface, a fraction which cannot be detached by extraction, and an unreacted, thus unattached AF fraction. Solvent extraction, FTIR and TGA measurements have confirmed the existence of the grafted AF molecules to the inorganic particle's surfaces. Aging tests, developed in the present work, have shown a significant decrease of the AF migration rate, thus confirming an extended duration of the anti‐fog's activity. POLYM. ENG. SCI., 54:2023–2028, 2014. © 2013 Society of Plastics Engineers
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.23755