Properties of thermoplastic polyurethane adhesives containing nanosilicas with different specific surface area and silanol contentand silanol content

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Title: Properties of thermoplastic polyurethane adhesives containing nanosilicas with different specific surface area and silanol contentand silanol content
Authors: Vega Baudrit, José | Sibaja Ballestero, María | Vázquez, Patricia | Torregrosa Maciá, Rosa | Martín-Martínez, José Miguel
Research Group/s: Laboratorio de Adhesión y Adhesivos
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad Nacional (Costa Rica). Laboratorio de Polímeros | Universidad Nacional de La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas
Keywords: Polyurethane | Infrared spectra | Rheology | Mechanical properties of adhesives
Knowledge Area: Química Inorgánica
Date Created: 2006
Issue Date: Sep-2007
Publisher: Elsevier
Citation: VEGA BAUDRIT, José, et al. "Properties of thermoplastic polyurethane adhesives containing nanosilicas with different specific surface area and silanol content". International Journal of Adhesion and Adhesives. Vol. 27, Issue 6 (Sept. 2007). ISSN 0143-7496, pp. 469-479
Abstract: Thermoplastic polyurethane (TPU) adhesives containing nanosilicas with different specific surface area and silanol group content were prepared and characterized by FTIR spectroscopy, differential scanning calorimetry (DSC), thermogravimetry (TGA), X-ray diffraction, plate-plate rheology, dynamical–mechanical–thermal analysis (DMTA), transmission electron microscopy (TEM), and strain–stress test. Adhesive strength was obtained from T-peel tests of PVC/polyurethane adhesive joints. Formation of agglomerates of nanosilica particles within the polyurethane matrix were favoured by increasing the silanol content likely due to stronger hydrogen bond interactions between the silanol groups on the nanosilica over those between the polyurethane and the nanosilica. As a consequence, inter-urethane bonds formation rather than ester-urethane bonds were favoured, leaving the soft segment chains more free to interact between them. Thus, addition of nanosilica favoured the phase segregation in the thermoplastic polyurethane. The increase in specific surface area and silanol content in the nanosilica, generally enhanced the degree of phase separation in the polyurethane, being less marked for nanosilicas with more than 200 m2/g and 0.60 mmol SiOH/gsilica. On the other hand, the addition of the nanosilica improved the tensile strength and elongation at break, and the viscoelastic properties of the polyurethane. The immediate adhesive strength of PVC/polyurethane adhesive joints increased in the filled adhesives and it was determined by the rheological properties of the polyurethane–nanosilica mixtures. By increasing the time after joint formation, the crystallization of the polyurethane was produced giving higher adhesive strength and although a cohesive failure in the PVC was always obtained, a slight though progressive increase in joint strength was found with the passage of time with the ordering of the three systems (PU-0.45, PU-0.60 and PU-0.90) remaining unchanged with the PU-0.60 system the stronger and the PU-0.90 system the weaker. This is in agreement with the trends in the viscoelastic and mechanical properties of the filled adhesives.
URI: http://hdl.handle.net/10045/2664
ISSN: 0143-7496
DOI: 10.1016/j.ijadhadh.2006.08.001
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.ijadhadh.2006.08.001
Appears in Collections:INV - LAA - Artículos de Revistas

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