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It addresses long-term mechanical degradation on polymeric surfaces and aims to prevent or delay damage caused by electrical arcs and resulting surface flashover from wettability-related issues. Microcapsules containing DMS-S12 and DBTL are encapsulated and embedded in a PDMS elastomer matrix, then sprayed onto multiple substrates, showing high contact angle, self-cleaning and cryophobic behavior, robust stability under extreme environments, and improved electrical performance including reduced leakage current and increased flashover voltage.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/fabrication-of-durable-self-healing-superhydrophobic-coating-to-improve-the-performance-of-high-voltage-insulators-during-winter-conditions/514372/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/fabrication-of-durable-self-healing-superhydrophobic-coating-to-improve-the-performance-of-high-voltage-insulators-during-winter-conditions/514372.png","ImageObject",300,407,{"name":92,"@type":93},"Genevieve","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-10","2026-10-06",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What problem does the thesis address for high-voltage insulators in winter conditions?","Question",{"text":112,"@type":113},"It targets long-term mechanical and wettability-related damage that can lead to issues such as electrical-arc damage and flashover. The goal is to improve durability and delay functional loss under harsh conditions.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How are the self-healing microcapsules incorporated into the final coating?",{"text":117,"@type":113},"Polydimethylsiloxane (DMS-S12) and a DBTL catalyst are separately encapsulated in a poly(melamine-urea-formaldehyde) membrane via emulsion polymerization, then embedded into a PDMS matrix (SILGARD 184) to form a composite coating.",{"name":119,"@type":110,"acceptedAnswer":120},"What electrical and functional improvements does the superhydrophobic coating provide?",{"text":121,"@type":113},"The coating shows lower dielectric permittivity and loss factor than a bare sample, reduces surface leakage current in high-humidity environments, and increases flashover voltage across dry, wet, and polluted conditions.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},514372,1791492586,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},1374391974585,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","Fabrication of Durable Self-healing Superhydrophobic Coating to Improve the Performance of High Voltage Insulators During Winter Conditions  \nBy  \nAnahita Allahdini Hesarouyeeh  \nUnder supervision of Prof. Gelareh Momen and co-supervision of Prof. Reza Jafari  \nManuscript-Based Thesis Presented to Université du Québec à Chicoutimi in Partial fulfillment of the Requirements for the Degree of Doctor of Philosophy (Ph.D.) in Engineering  \nBOARD OF EXAMINERS:  \nProfessor Yasar Kocaefe, Department of Applied Sciences at UQAC, President of the Board Professor Sylvain G. Cloutier, École de technologie supérieure (ETS), External Member of the Board Doctor Ehsan Bakhshandeh, Department of Applied Sciences at UQAC, Internal Member ofthe Board Professor Gelareh Momen, Department of Applied Sciences at UQAC, Internal Member of the Board Professor Reza Jafari, Department of Applied Sciences at UQAC, Internal Member of the Board  \nQuébec, Canada  \n© Anahita Allahdini Hesarouyeeh, Spring 2022  \nRÉSUMÉ  \nAvec l’émergence dans plusieurs domaines de nouveaux types de matériaux, polymères et technologies qui ont révolutionné les infrastructures sociales et industriels, la demande pour des matériaux de nouvelle génération multifonctionnels à propriétés spécifiques enregistre une forte croissance. Notamment, les matériaux superhydrophobes et autoréparant ont connu une ascension fulgurante, au cours des dernières décennies.  \nDans des applications pour la vie quotidienne, les revêtements et les surfaces subissent de sévères contraintes mécaniques qui affectent l’intégrité des structures à long terme. Pourtant, il existe très peu deméthodes disponibles pour maintenir l’efficacité et leur durabilité lorsque les surfaces polymériques sontabimées. Ainsi, s’inspirant de mère nature et du potentiel auto-régénérassions des systèmes biologiques, des matériaux composites autoréparant ont été développé pour apporter une solution auto-réparatrice avec très peu voire aucune intervention humaine.  \nIci, la conception d’un revêtement superhydrophobe multifonctionnel capable d’augmenter la durée de vie effective des isolateurs à haute tension est au cœur de notre préoccupation. Ce dernier vise à prévenir voire retarder les éventuels dommages mécaniques causés par les arcs électriques et les contournements résultant de problèmes de mouillabilité et de ces dommages.  \nDans un premier temps, un polydiméthylsiloxane doté d’une terminaison en silanol téléchélique (DMS-S12) et un catalyseur (dilaurate de Dibutylétain, DBTL) ont été encapsulés séparément dans membrane de poly (mélamine-urée-formaldéhyde) via la technique de polymérisation en émulsion. L'encapsulation des matériaux du noyau ainsi que la morphologie de surface, la distribution de leur taille et la stabilité thermique des microcapsules ont été étudiées. Les microcapsules synthétisées présentaient un diamètre compris entre 10- 110 µm avec une morphologie sphérique et uniforme, et une stabilité thermique jusqu'à des températures élevées. Celles ont été incorporées par la suite à l'intérieur d'une matrice élastomérique de polydiméthylsiloxane (PDMS), dénommée SILGARD 184 pour former le revêtement composite. Le potentiel de cicatrisation du composite de silicone ainsi obtenu a été évalué en surveillant une réparation de fissure par microscopie électronique à balayage (MEB) et en mesurant l'ampleur de la récupération des propriétés mécaniques par des essais de traction.  \nDans un second temps, le revêtement développé a été appliqué par pulvérisation sur une variété de substrats notamment le verre, la porcelaine, l'aluminum et l'acier. Le revêtement présent un angle de contact de 163° et une hystérésis d'angle de contact de 2.3° avec d'excellentes propriétés autonettoyantes (évalué en pollution sèche et humide) et glaciophobes (faible adhérence à la glace et retard élevé du temps de congélation) . La robustesse et la durabilité représentent généralement le talon d'Achille des matériaux superhydrophobes. C’est po","cbCaigG55DiwuvSf","https://ap.wps.com/l/cbCaigG55DiwuvSf","pdf",9242291,215,"English","# RÉSUMÉ\n## Motivation and objective\n## Microcapsule fabrication and composite formation\n## Application and performance on substrates\n## Electrical performance under applied stress\n## Thin-layer self-healing evaluation","[{\"question\":\"What problem does the thesis address for high-voltage insulators in winter conditions?\",\"answer\":\"It targets long-term mechanical and wettability-related damage that can lead to issues such as electrical-arc damage and flashover. The goal is to improve durability and delay functional loss under harsh conditions.\"},{\"question\":\"How are the self-healing microcapsules incorporated into the final coating?\",\"answer\":\"Polydimethylsiloxane (DMS-S12) and a DBTL catalyst are separately encapsulated in a poly(melamine-urea-formaldehyde) membrane via emulsion polymerization, then embedded into a PDMS matrix (SILGARD 184) to form a composite coating.\"},{\"question\":\"What electrical and functional improvements does the superhydrophobic coating provide?\",\"answer\":\"The coating shows lower dielectric permittivity and loss factor than a bare sample, reduces surface leakage current in high-humidity environments, and increases flashover voltage across dry, wet, and polluted conditions.\"}]","Fabrication of Durable Self-healing Superhydrophobic Coating to Improve the Performance of High Voltage Insulators During Winter Conditions | PDF",1791298951,542]