| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tirri, Teija
Åbo Akademi University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2023Dry Reforming of Methane over Ni-Fe-Al Catalysts Prepared by Solution Combustion Synthesiscitations
- 2021On Laccase-Catalyzed Polymerization of Biorefinery Lignin Fractions and Alignment of Lignin Nanoparticles on the Nanocellulose SurfaceviaOne-Pot Water-Phase Synthesiscitations
- 2021On Laccase-Catalyzed Polymerization of Biorefinery Lignin Fractions and Alignment of Lignin Nanoparticles on the Nanocellulose Surface via One-Pot Water-Phase Synthesiscitations
- 2021Sulfenamides as Standalone Flame Retardants for Polystyrenecitations
- 2020Tailored thermosetting wood adhesive based on well-defined hardwood lignin fractionscitations
- 2018The Synthesis of Low-Viscosity Organotin-Free Moisture-Curable Silane-Terminated Poly(Urethane-Urea)scitations
- 2017Investigation on the Influence of Chain Extenders on the Performance of One-Component Moisture-Curable Polyurethane Adhesivescitations
- 2016Structure–Property Studies on a New Family of Halogen Free Flame Retardants Based on Sulfenamide and Related Structurescitations
- 2015The effect of core-shell particle morphology on adhesive properties of poly(styrene-co-butyl acrylate)citations
- 2013Flame retardant polyurethane nanocomposite: Study of clay dispersion and its synergistic effect with dolomitecitations
Places of action
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article
Investigation on the Influence of Chain Extenders on the Performance of One-Component Moisture-Curable Polyurethane Adhesives
Abstract
In this work, a no. of chain extended moisture-curable urethane prepolymers were synthesized in order to develop isocyanate terminated urethane prepolymer formulations that would simultaneously display both high adhesive strength and low viscosity. Proton NMR spectroscopy ( 1 H-NMR), size exclusion chromatog. (SEC), differential scanning calorimetry (DSC), and Brookfield viscometry were utilized for characterizing the prepd. urethane prepolymers. In addn., the adhesion strength of the cured prepolymers was detd. by tensile shear strength test according to the DIN EN (Deutsches Institut fuer Normung, the German Institute for Standardization) 1465 std. Esp., the role of different types of linear (butanediol, pentanediol) and branched chain extenders (dipropyleneglycol (di-PPG)), tripropyleneglycol (tri-PPG) and the influence of their dosage on the degree of microphase sepn. between hard segments (HS) and soft segments (SS) in urethane prepolymers were studied. Furthermore, the benefits of utilizing either a one-step vs. a two-step polymn. process were investigated. The results revealed that the extent of phase sepn. of different urethane prepolymers was dependent on the extent of hydrogen bonding interactions which was extensively studied by attenuated total reflectance IR spectroscopy (ATR-FTIR). The incorporation of branched chain extenders (di-PPG and tri-PPG) did not result in notable phase sepn. between hard segments and soft segments, while linear chain extenders (pentanediol and butanediol) readily promoted phase sepn. The degree of phase sepn. was particularly pronounced for butanediol, and when the linear chain extender ratio was higher than or equal to 0.74. Compared with a two-stage process, one-stage process produced more randomly distributed polymer chains with highly dispersed hard segments. Thus, urethane prepolymers exhibiting strong adhesive strength with simultaneously low viscosity were successfully developed by systematic adjustment of structural parameters.