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Preparation of rigid polyurethane foams catalyzed by metal-asparagine and metal-threonine complexes
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This research aimed to synthesize metal-amino acid complexes in the form of aqueous solutions to serve as new catalysts for the preparation of rigid polyurethane foams. Aqueous solutions of metal-amino acid complexes were prepared from the reaction of metal acetates with amino acids and water was used as a solvent. Metal acetates employed were copper acetate and zinc acetate. Amino acids employed were asparagine (Asn) and threonine (Thr). Both amino acids are odorless and non-toxic. UV-Vis spectroscopy, FTIR spectroscopy and mass spectrometry were used to characterize metal-amino acid complexes. Metal-amino acid complexes, namely Zn(Asn)₂, Zn(Thr)₂, Cu(Asn)₂ and Cu(Thr)₂ (where Asn = asparagine and Thr = threonine), in the form of aqueous solutions were obtained and used as such catalysts for the preparation of polyurethane foam. Reaction times, physical properties and mechanical properties of the prepared foam were studied. The results were compared with RPUR foam catalyzed by DMCHA. The experimental results showed that Cu(Thr)₂ had the best catalytic activity among all metal-amino acid complexes.
Title: Preparation of rigid polyurethane foams catalyzed by metal-asparagine and metal-threonine complexes
Description:
This research aimed to synthesize metal-amino acid complexes in the form of aqueous solutions to serve as new catalysts for the preparation of rigid polyurethane foams.
Aqueous solutions of metal-amino acid complexes were prepared from the reaction of metal acetates with amino acids and water was used as a solvent.
Metal acetates employed were copper acetate and zinc acetate.
Amino acids employed were asparagine (Asn) and threonine (Thr).
Both amino acids are odorless and non-toxic.
UV-Vis spectroscopy, FTIR spectroscopy and mass spectrometry were used to characterize metal-amino acid complexes.
Metal-amino acid complexes, namely Zn(Asn)₂, Zn(Thr)₂, Cu(Asn)₂ and Cu(Thr)₂ (where Asn = asparagine and Thr = threonine), in the form of aqueous solutions were obtained and used as such catalysts for the preparation of polyurethane foam.
Reaction times, physical properties and mechanical properties of the prepared foam were studied.
The results were compared with RPUR foam catalyzed by DMCHA.
The experimental results showed that Cu(Thr)₂ had the best catalytic activity among all metal-amino acid complexes.
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