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Tuesday, 14 August 2018
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Raw materials & technologies, Applications

Fast preparation of biopassive nonfouling coatings on cellulose

Wednesday, 8 August 2018

In a new study, scientists document a highly nonfouling surface coating formed by a functional copolymer consisting of 2-methacryloyloxyethyl phosphorylcholine and 4-benzophenyl methacrylate.

The zwitterionic polymer functionalisation has substantial nonfouling capacity against bacteria and fungi. Source: Giovanni Cancemi – stock.adobe.com.

The zwitterionic polymer functionalisation has substantial nonfouling capacity against bacteria and fungi. Source: Giovanni Cancemi – stock.adobe.com.

The microbial infection as a result of biofilm formation is a serious problem in various fields of application in the paper industry including fouling of filters in air conditioning systems, wallpaper, medical and food packaging as well as ancient documents. In a new study, scientists document a highly nonfouling surface coating formed by a functional copolymer consisting of 2-methacryloyloxyethyl phosphorylcholine, as a zwitterionic and cell repellent component, and 4-benzophenyl methacrylate, acting as an anchor group for a fast UV-induced persistent covalent attachment on thin cellulose model films deposited on silicon wafers.

Substantial nonfouling capacity

The grafting process, studied by UV–Vis spectroscopy, is much faster in comparison with common grafting-to techniques. The obtained sustainable and nonleaching surface coatings were analysed by attenuated total reflectance-Fourier transform infrared spectroscopy, contact angle measurements, spectroscopic in situ ellipsometry, and atomic force microscopy. Incubation of the modified cellulose surfaces with either Escherichia coli, Bacillus subtilis or Saccharomyces cerevisiae demonstrates that the zwitterionic polymer functionalisation has substantial nonfouling capacity against both Gram-negative and Gram-positive bacteria as well as the yeast fungus.

The study is published in: Journal of Coatings Technology and Research  July 2018, Volume 15, Issue 4, pp 703–712.

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