Revealing of interphases in bonded joints with a fiber optic sensor based on Fresnel reflection. (June 2019)

• Record Type: Journal Article
• Authors: Grangeat, R.; Girard, M.; Lupi, C.; Leduc, D.; Jacquemin, F.
• Is Part Of: International journal of adhesion & adhesives. Volume 91(2019)
• Page Start: 12
• Page End: 18
• Publication Date: 2019-06
• Subjects: Epoxides -- Interfaces -- Interphases -- Polymerization -- Optical fiber sensor -- Monitoring; Adhesion -- Periodicals; Adhesives -- Periodicals; Adhésion (Physique) -- Périodiques; Adhésifs -- Périodiques; Adhesie; Kleefstoffen; Adhesion; Adhesives; Periodicals; 668.3
• DOI: 10.1016/j.ijadhadh.2019.02.009
• Languages: English
• ISSNs: 0143-7496

Abstract

Abstract: The interfacial zone between the polymer and the substrate is a particular area where physical or chemical bonds are established. It is important to understand the phenomenon occurring in this area, the literature highlights a possible under-crosslinking. Therefore, there is a polymerization gradient in the thickness of the adhesive joint that is called interphase. The aim of this study is to reveal this interphase by following the evolution of the polymerization rate. In general, this degree of crosslinking is determined by a differential scanning calorimetry (DSC) analysis. This study describes the steps of the kinetics of polymerization by measuring the refractive index of the adhesive. For that purpose, a fiber optic sensor based on Fresnel reflection is used. This sensor measures the evolution of the refractive index of the adhesive during the manufacturing process. To our knowledge, this is the only technique which allows in situ monitoring of the polymerization rate in a non-destructive manner. It is then possible to conclude on the presence, or absence of a polymerization gradient in the thickness of the bonded joint.