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Thursday, 18 July 2019
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Raw materials & technologies, Technologies

Polymers from natural sources as protective coatings for stone surfaces

Thursday, 21 January 2016

Aromatic triblock polymers were synthesised, characterised, and tested as protective coatings for stone surfaces.

Italian researchers tested aromatic triblock polymers as protective coatings for stone surfaces. Source: twinlili/pixelio.de

Italian researchers tested aromatic triblock polymers as protective coatings for stone surfaces. Source: twinlili/pixelio.de

Syntheses were carried out by a ring opening polymerisation process from specifically synthesised monomers ((3S)-6-methyl-3-phenyl-1,4-dioxan-2,5-dione or 1,4-benzodioxepin-3-methyl-2,5-dione) and a perfluoropolyether diol (Fluorolink D10-H), as chain initiator.

Excellent stability to environmental conditions was noticed

Polymers were characterised through spectroscopic and analytical techniques while their stability under photo-oxidative conditions was tested using a Solar Box. An excellent stability to environmental conditions was noticed with very low degradation during accelerated aging tests up to 1000 h, as detected by FTIR, molecular weight, DSC and weight loss. Furthermore, these polymers formed an excellent protective coating on the stone surface as shown by capillary water absorption test. Finally, as expected, very stable coatings were obtained as shown by aging tests. The stone surface showed negligible changes of colour and a good hydrorepellency confirming a good durability of treatments.

The study is published in: Applied Polymer Science.

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