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Poly(ethylene) glycol-modified, amphiphilic, siloxane–polyurethane coatings and their performance as fouling-release surfaces

Lookup NU author(s): Dr John Finlay, Dr Sofia Franco, Professor Tony Clare



This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).


Amphiphilic siloxane–polyurethane (AmSiPU) coatings were prepared using a series of polyisocyanate prepolymers modified with polydimethyl siloxane (PDMS) and poly(ethylene glycol) (PEG). Fouling-release performance of the AmSiPU coatings was evaluated through laboratory biological assays using several representative marine organisms. First, polyisocyanate prepolymers with compositional variation in PDMS and PEG were synthesized and characterized using Fourier transform infrared spectroscopy (FTIR) and isocyanate titrations. Then, the prepolymers were incorporated into coatings. Surface wettability of the coatings was evaluated using contact angle and surface energy measurements. Coatings’ surfaces were also characterized using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). ATR-FTIR and XPS experiments revealed that both PDMS and PEG moieties were present on the surface suggesting amphiphilic character. AFM phase images show microphase separation. AmSiPU coatings show excellent fouling-release performance toward bacteria (Cellulophaga lytica), the diatoms (Navicula incerta), and the green algae (Ulva linza), demonstrating comparable or superior performance to many commercial amphiphilic fouling-release coatings. Despite the incorporation of hydrophilic PEG, AmSiPU coatings show good macrofouling release which is often challenging with amphiphilic coating systems. AmSiPU coatings are a nontoxic and tough fouling-release solution with comparable performance to benchmarks in the fouling-release coatings market.

Publication metadata

Author(s): Galhenage TP, Webster DC, Moreira AMS, Burgett RJ, Stafslien SJ, Vanderwal L, Finlay JA, Franco SC, Clare AS

Publication type: Article

Publication status: Published

Journal: Journal of Coatings Technology and Research

Year: 2017

Volume: 14

Issue: 2

Pages: 307-322

Print publication date: 01/03/2017

Online publication date: 18/10/2016

Acceptance date: 18/10/2016

Date deposited: 05/01/2017

ISSN (print): 1945-9645

ISSN (electronic): 1935-3804

Publisher: Springer


DOI: 10.1007/s11998-016-9862-9

Notes: The online version of this article (doi:10.1007/s11998-016-9862-9) contains supplementary material, which is available to authorized users.


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Funder referenceFunder name
N00014-13-1-0634Office of Naval Research