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Title: The durability of adhesion of polysulfide sealants to glass
Author: Lowe, George Bernard
Awarding Body: De Montfort University
Current Institution: De Montfort University
Date of Award: 1992
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A number of polysulfide based sealants similar to those used commercially in insulated glass manufacture were prepared and used in this programme of work. The formulations were designed to cover the spectrum of formulations sold commercially, especially with respect to polymer content, and to this end a number of commercial sealants were tested in order to ensure comparability. The sealants were tested in glass/ sealant/ glass joints and examined for changes in joint strength and adhesion properties. Films of the sealant were subjected to the same ageing conditions and their physical properties checked. The rate of change of adhesion properties was compared with the diffusion of water vapour into the cured films as measured by mass uptake experiments. The mode of failure was noted. The changes were also examined chemically by surface analysis and the results examined for a relationship between formulation changes , such as polymer content , with diffusion rate which in turn could be related to onset of adhesion bond loss. The results show that the primary cause of adhesion failure is plasticiser migration to the interface causing weakening of the interface and eventual adhesion failure. The diffusion of water into the sealant mass in the joints plasticises the sealant causing a lowering of the modulus of the sealant and creating the thermodynamic conditions to cause plasticiser migration.
Supervisor: Not available Sponsor: Morton International Ltd
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available