Influence of the filler material on the thermal stability of one-component moisture-curing polyurethane adhesives

Filler materials are part and parcel for the adjustment of adhesives, in particular, their rheological and mechanical properties. Furthermore, the thermal stability of adhesives can be positively influenced by the addition of an expedient filler, with inorganic types common practice in most cases. I...

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Bibliographic Details
Published in:Journal of applied polymer science 2012-06, Vol.124 (5), p.3641-3649
Main Authors: Clauß, Sebastian, Dijkstra, Dirk J., Gabriel, Joseph, Karbach, Alexander, Matner, Mathias, Meckel, Walter, Niemz, Peter
Format: Article
Language:English
Subjects:
adhesion
Adhesives
Application fields
Applied sciences
Bonded joints
Cohesion
Composites
Exact sciences and technology
Fillers
Forms of application and semi-finished materials
Materials science
mechanical properties
Polymer industry, paints, wood
Polymers
Polyurethane resins
polyurethanes
Prepolymers
Technology of polymers
Thermal stability
Wood
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Summary:Filler materials are part and parcel for the adjustment of adhesives, in particular, their rheological and mechanical properties. Furthermore, the thermal stability of adhesives can be positively influenced by the addition of an expedient filler, with inorganic types common practice in most cases. In this study, one‐component moisture‐curing polyurethane adhesives for engineered wood products based on isocyanate prepolymers with different polymer‐filled polyether polyols were investigated with regard to the filler's potential to increase the thermal stability of bonded wood joints. The property changes due to the addition of fillers were determined by means of mechanical tests on bonded wood joints and on pure adhesive films at different temperatures up to 200°C. Additional analyses by atomic force and environmental scanning electron microscopy advanced the understanding of the effects of the filler. The tested organic fillers, styrene acrylonitrile, a polyurea dispersion, and polyamide, caused increases in the cohesive strength and stiffness over the whole temperature range. However, the selected filler type was hardly important with regard to the tensile shear strength of the bonded wood joints at high temperatures, although the tensile strength and Young's modulus of the adhesive films differed over a wide range. Prepolymers with a lower initial strength and stiffness resulted in worse cohesion, in particular, at high temperatures. This disadvantage, however, could be compensated by means of the filler material. Ultimately, the addition of filler material resulted in optimized adhesive properties only in a well‐balanced combination with the prepolymer used. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
ISSN:0021-8995
1097-4628
DOI:10.1002/app.35223