Kinetics of Moisture Cure of Silicone Sealants |
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Authors: | J Comyn J Day S J Shaw |
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Affiliation: |
a Department of Chemistry, De Montfort University, Leicester, UK
b Structural Materials Centre, Defence Research Agency, Famborough, Hants, UK |
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Abstract: | The depth of moisture cure (z) has been measured for lap joints in aluminium with a conventional sealant based on polydimethylsiloxane and one based on polytrifluoro-propylmethylsiloxane. The cured sealant acts as a barrier to the permeation of water; any water which passes through this barrier causes further cure which thickens the barrier. The depth of cure is given by z = (2PVpt)1/2, where P is the permeability coefficient of water in cured sealant, V is the volume of sealant which reacts with 1 mole of water, p is the vapour pressure of water and t is time. |
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Keywords: | Silicone sealant fluorosilicone sealant permeability to water vapour amount of water needed for cure kinetics of moisture cure mechanism of moisture cure |
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