Theoretical Investigation of Ice-Shedding Coatings
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Authors
Harper, Alex
Date
Type
thesis
Language
eng
Keyword
Ice-Shedding , Theoretical , Coating , Polymers
Alternative Title
Abstract
Theoretical studies into the properties of ice-shedding coatings allow for their development time to be reduced by suggesting avenues to approach for development based on their fundamental properties. The aim of this thesis is to model the behaviour of lubricant-swollen polymer gels and a similar gel with a grafted brush layer to evaluate them as ice-shedding coatings.
Syneresis, the mechanism behind the lubricant-swollen polymer gels, was modelled using a modified version of the Flory-Rehner equation. The mechanism was shown to be dependent on three parameters, the crosslinking density of the coating, the degree of polymerization for the lubricant, and the amount of lubricant swelling the system. Increasing any of the parameters was shown to increase the temperature for the onset of excretion, as well as the amount of excretion at a given temperature. The failure mechanism for these coatings was predicted to be the point where enough lubricant has been lost that syneresis does not occur within the operating temperature range of the coating. In addition, a coating has been proposed where the crosslinking density and degree of polymerization will dynamically increase with decreasing temperature using H-bonding to improve the efficacy of the excretion.
The lubricant-swollen polymer gel with a brush layer was modelled as a crosslinked matrix bound to a substrate with a grafted brush layer being swollen by a lubricant. The matrix used the modified Flory-Rehner equation, while the brush layer was modelled using a mean-field theory from literature. The system was shown to have two regimes: a sub-excretion regime and an excretion regime. In the excretion regime, the lubricant-swollen polymer gel with a grafted brush layer was predicted to react similarly to the coating without a grafted brush layer when changing crosslinking density and degree of polymerization. In the sub-excretion regime, the coating was predicted to have lubricant shift from the matrix to the brush layer given a decrease in temperature. This shift allows the coating to act as a low-interfacial toughness material should the coating be unable to undergo syneresis.
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CC0 1.0 Universal
ProQuest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.
CC0 1.0 Universal