Aging Assessment of High Voltage Single Component Room Temperature Vulcanized Silicone Rubber (RTV-1) Subjected to Aqueous Salt

<p>Single component room temperature vulcanized (RTV-1) silicone based caulk used in high voltage insulators and other applications is frequently subjected to environmental pollutants. Aging of RTV-1 silicone rubber is the result of various stressors, including environmental aging conditions such as UV, acid, and salt exposure from ocean mist. Loss of hydrophobicity due to damage of the hydrophobic methyl groups, as well as loss of mechanical strength due to depolymerization via hydrolysis as a result of aqueous salt exposure were the two main factors of material aging assessed in this work. Multiple RTV-1 formulations were initially assessed for resistance to aging in aqueous salt, with one particular RTV-1 material subsequently chosen for further study in successive aging experiments. 3% NaCl salt solution experiments were conducted to analyze physical, mechanical, and chemical changes. A subsequent but preliminary hypochlorous acid aging experiment was then conducted, with results indicating accelerated RTV aging as a result of super diffusive hypochlorous acid. Comparatively, a molecular dynamics model was developed to analyze salt ion, water, nitric acid, and hypochlorous acid diffusion through the RTV polymer network, indicating hypochlorous acid as super diffusive, chlorine as diffusive, and water as subdiffusive. Conclusively, the experimental and molecular dynamics results provide a method to better understand the impact of contaminants and pollutants on RTV-1 material aging as a product of molecular diffusion.</p>

Name thesis:degree_name

M.S.

Level thesis:degree_level

Masters Thesis

Year dc:date.available

2016

Author dc:creator

• Bleszynski, Monika

Contributors dc:contributor

• Maciej Kumosa, Ph.D.
• Paul Predecki
• Sandra S. Eaton
• James Wilson

• Depolymerization
• Molecular diffusion
• Material aging
• Materials Science and Engineering
• Mechanical Engineering
• Polymer and Organic Materials

Statement dc:rights

• <p>Copyright is held by the author. User is responsible for all copyright compliance.</p>

Language dc:language

en

Repository record dc:identifier

https://digitalcommons.du.edu/etd/1088

OAI identifier oai:identifier

oai:digitalcommons.du.edu:etd-2088