ADHESION CONSIDERATIONS

Interfacial aspects and adhesion of polysulfides have been studied extensively and reported by us [3,17]. The epoxy-modified polysulfide has improved adhesion due to chemical reactions that increase electronic attraction forces. Water has been found to be the most potent debonding agent in cured polysulfides. Formation of thiourethane is responsible for excellent adhesion of polysulfide onto polyurethane coatings.

Contained in cured Polysulfide Thiourethane

polyurethane sealant

Titanates used as primers interact with polysulfide to produce a tough layer of Ti-S, resulting in enhanced adhesion [17]. We have employed SEM extensively to study poly­sulfide debonding and events occurring at the interface and have found it to be a very useful tool.

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