Synthesis of Silanated Coconut Oil-Based Waterborne Polyurethane Coating for Corrosion Protection Dave Joseph E. Estrada 1,2,a* , Amierson C. Tilendo 3,b , Arnold C. Alguno 7,c , Alona A. Lubguban 4,d , Gerard G. Dumancas 5,e , Anthony O. Maputi 1,f , Vanessa Enobio 2,g , Roberto M. Malaluan 1,6,h , and Arnold A. Lubguban 1,6,i* 1 Center for Sustainable Polymers, Mindanao State University - Iligan Institute of Technology, Iligan City, 9200Philippines 2 Graduate School, College of Engineering and Technology, Mindanao State University - Iligan Institute of Technology, Iligan City, 9200 Philippines 3 Department of Chemical Engineering, Mindanao State University - Main Campus, Marawi City, 9700 Philippines 4 University of the Philippines Rural High School, Paciano Rizal, Bay, Laguna, 4033 Philippines 5 Department of Chemistry, Loyola Science Center, The University of Scranton, Scranton, PA, USA 18510 6 Department of Chemical Engineering and Technology, Mindanao State University - Iligan Institute of Technology, Philippines, Iligan City, 9200 Philippines 7 Department of Physics, Mindanao State University - Iligan Institute of Technology, Iligan City, 9200 Philippines a* davejoseph.estrada@g.msuiit.edu.ph, b amierson.tilendo@g.msuiit.edu.ph, c arnold.alguno@g.msuiit.edu.ph, d alonalubguban@yahoo.com, e gerard.dumancas@scranton.edu, f anthony.maputi@g.msuiit.edu.ph, g vanessa.enobio@g.msuiit.edu.ph, h roberto.malaluan@g.msuiit.edu.ph, i* arnold.lubguban@g.msuiit.edu.ph Keywords: Anti-corossion coating, adhesion strength, coconut oil, silane, thermal stability, waterborne. Abstract. In this study, an eco-friendly coconut oil-based polyol blend was synthesized for bio-based waterborne polyurethane (WBPU) and WBPU-silane composite coatings. It was demonstrated that an increase in silane content incorporated into the WBPU matrix significantly enhanced the corrosion protection of WBPU coatings. Results also show a fourfold increase in the adhesion strength of WBPU-silane composite coatings as compared to that of bare WBPU coatings. Further, the water contact angle revealed that hydrophobic properties increase as the silane content incorporated into the WBPU matrix increases. This work provides a novel route for enhanced corrosion protection utilizing a bio-based polyol blend. Introduction Polyurethanes (PU) are widely used in a diverse range of applications, including foams, inks, sealants, adhesives, and coatings [1,2]. Specifically, PUs are widely used to address metal corrosion by at least inhibiting or retarding it by isolating the metal surface from the surrounding environment [3]. Solvent- borne PU process is conventionally used during the production of the aforementioned applications which utilizes hazardous air pollutants and volatile organic compounds (VOCs) thereby posing several health risks and serious environmental hazards [4]. In the last decade, concerns about the negative impact of solvent-borne and petroleum-based PUs on human health and the environment have paved the way for more environmentally friendly alternative approaches [3]. As such, alternative approaches have been identified for green PUs including but not limited to isocyanate-free formulations, reduction of VOC emissions by limiting the use of organic solvents, renewability of the starting materials, and sustainability of the synthesis itself [3,5]. Additionally, over the years, eco- friendly waterborne polyurethanes (WBPUs) have also been used to replace the conventional solvent- Solid State Phenome Submitted: 2022-11-15 ISSN: 1662-977 Revised: 2023-07-06 doi:10.4028/p- Accepted: 2023-07-10 © 2023 Trans Te All Rights Reser Online: 2023-10-27 All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications L net. (#679438 4:55:34)