Catalyst Free Silicone Sealants That Cure Underwater. (9th April 2020)

• Record Type: Journal Article
• Authors: Bui, Robert; Brook, Michael A.
• Is Part Of: Advanced functional materials. Volume 30:Number 23(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-04-09
• Subjects: aldehydes -- aminosilicones -- rapid crosslinking -- silicone elastomers -- silicone sealants; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202000737
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Silicone sealants and adhesives are widely used to prevent the ingress of water. However, silicones must normally be cured in air, as excess water inhibits or prevents cure from occurring. It is reported that aqueous solutions of the aliphatic aldehydes glutaraldehyde, glyoxal or, particularly, formaldehyde rapidly react without catalysts with a variety of aminopropyl‐modified silicone polymers to give silicone elastomers, even underwater. These products, whose properties are readily tailored by controlling the density of amino groups in the starting materials, may be 3D printed, or used both as adhesives and sealants in air or water. Abstract : Aqueous solutions of the small aldehydes glutaraldehyde, glyoxal, and especially formaldehyde, react rapidly with aminopropylsilicones to create silicone elastomers in air or under water, that can act as sealants or adhesives, including in 3D printing applications.