Development and Study of a New Silane Based Polyurethane Hybrid Flexible Adhesive—Part 1: Mechanical Characterization

Author:

Rodrigues Vasco C. M. B.1,Marques Eduardo A. S.2,Carbas Ricardo J. C.1ORCID,Youngberg Michael3,Dussaud Anne3,Beygi Reza1ORCID,Da Silva Lucas F. M.2ORCID

Affiliation:

1. Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal

2. Department of Mechanical Engineering, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal

3. Momentive Performance Materials Inc., 769 Old Saw Mill River Road, Tarrytown, NY 10591, USA

Abstract

The need for more sustainable adhesive formulations has led to the use of silane-based adhesives in different industrial sectors, such as the automotive industry. In this work, the mechanical properties of a dual cure two-component prototype adhesive which combined silylated polyurethane resin (SPUR) with standard epoxy resin was characterized under quasi-static conditions. The characterization process consisted of tensile bulk testing, to determine the Young’s modulus, the tensile strength and the tensile strain to failure. The shear stiffness and shear strength were measured by performing a thick adherend shear test. The in-plane strain field was obtained using a digital image correlation method. Double-cantilever beam and mixed-mode tests were performed to assess the fracture toughness under pure modes. The prototype adhesive showed promising but lower properties compared to commercial solutions. Furthermore, the adhesive was modified via the addition of three different resin modifier additives and characterized via measuring the shear and tensile properties, but no enhancements were found. Finally, the adhesive was formulated with three different SPUR viscosities. The critical energy release rate analysis showed an optimum value for the medium viscosity SPUR adhesive.

Publisher

MDPI AG

Subject

General Materials Science

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