Zwitterion-bearing silica sol for enhancing antifouling performance and mechanical strength of transparent PDMS coatings

Jinyan Tan, A. Catarina C. Esteves (Corresponding author), Jinlong Yang, Shuxue Zhou (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review


The simultaneous improvement of mechanical strength and inhibition of slime attachment for polydimethylsiloxane(PDMS)-based fouling-release coatings remains as a great challenge. In this work, a zwitterionic precursor (N-methoxyacylethyl)-3-aminopropyltriethoxysilane (MAPS) was co-hydrolyzed with tetraethoxysilane (TEOS) to afford zwitterion-bearing silica sols (h-MAPS). The h-MAPS was then simply blended with hydroxyl-terminated PDMS (PDMS-OH, 3060 cSt and 20,000 cSt) to fabricate zwitterion-containing PDMS coatings. The pre-hydrolysis process, including hydrolysis time and TEOS content, is critical to the transparency of the coatings. High optical transparency in the range of 88.1–91.4 % at 550 nm could be reached using appropriate h-MAPS. Both PDMS-OH (3060 cSt)- and PDMS-OH (20,000 cSt)-based coatings presented excellent resistance to slime attachment in real marine environment at relatively high h-MAPS content. An improvement in anti-protein adsorption and anti-bacteria properties was achieved for the coatings based on PDMS-OH (3060 cSt) attributed to the presence of more zwitterions at its surface. Addition of h-MAPS could increase the elastic modulus and tensile strength of PDMS coatings, particularly with high efficiency for the later one. More importantly, although the tensile strength of zwitterion-containing PDMS coatings at high h-MAPS content could be up to 15 MPa, its pseudobarnacle removal strength was lower than 0.4 MPa even after seawater immersion, indicating it retained a good fouling-release performance. As a whole, zwitterion-bearing silica sols can not only provide a new approach for introduction of zwitterions into PDMS coatings, but also efficiently solve the multiple drawbacks of PDMS-based fouling-release coatings, simultaneously.

Originele taal-2Engels
Aantal pagina's9
TijdschriftProgress in Organic Coatings
Vroegere onlinedatum5 apr. 2024
StatusGepubliceerd - jun. 2024


This work was supported financially by National Key Research and Development Program of China (Grant No. 2020YFE0100300 ) and National Natural Science Foundation of China (No. 51973036 ). Jinyan Tan particularly expressed his gratitude for China Scholarship Council for funding his study in Netherlands, as well as for Tiangang Xu for his help on the acquisition of some data in the revision stage of the manuscript.

China Scholarship Council
National Key Research and Development Program of China2020YFE0100300
National Natural Science Foundation of China51973036


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