Polyamide 6/silica hybrid materials by a coupled polymerization reaction

Polyamide 6/SiO 2 hybrid materials were produced by a coupled polymerization reaction of three monomeric components namely 1,1′,1′′,1′′′-silanetetrayltetrakis-(azepan-2-one) (Si(ε-CL) 4 ), 6-aminocaproic acid (ε-ACA) and ε-caprolactam (ε-CL) within one process. Si(ε-CL) 4 together with ε-ACA has bee...

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Bibliographic Details
Published in:Polymer chemistry 2015-01, Vol.6 (35), p.6297-6304
Main Authors: Kaßner, L., Nagel, K., Grützner, R.-E., Korb, M., Rüffer, T., Lang, H., Spange, S.
Format: Article
Language:English
Subjects:
Autoclaves
Initial pressure
Joining
Molecular structure
Monomers
Polyamide resins
Polymerization
Silicon dioxide
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Summary:Polyamide 6/SiO 2 hybrid materials were produced by a coupled polymerization reaction of three monomeric components namely 1,1′,1′′,1′′′-silanetetrayltetrakis-(azepan-2-one) (Si(ε-CL) 4 ), 6-aminocaproic acid (ε-ACA) and ε-caprolactam (ε-CL) within one process. Si(ε-CL) 4 together with ε-ACA has been found suitable as a precursor monomer for the silica and PA6 components. The accurate adjustment of the molar ratio of both components, as well as the combination of the overall process for producing the polyamide 6/SiO 2 hybrid material with the hydrolytic ring opening polymerization of ε-caprolactam is of great importance to achieve homogeneous products with a low extractable content. Water in comparison with ε-ACA has been found unsuitable as an oxygen source to produce uniformly distributed silica. The procedure was carried out in a commercial laboratory autoclave at 8 bar initial pressure. The molecular structure and morphology of the hybrid materials have been investigated by solid state 29 Si and 13 C NMR spectroscopy, DSC and FTIR spectroscopy and electron microscopy measurements.
ISSN:1759-9954
1759-9962
DOI:10.1039/C5PY00815H