Authors
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Böhme, F. ; Clausnitzer, C. ; Gruber, F. ; Grutke, S. ; Huber, T. ; Pötschke, P.; Voit, B.
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Title
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Hyperbranched poly (ether amide)s via nucleopholic ring opening reaction of oxazolines
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Date
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14.06.2001
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Number
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9438
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Abstract
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The nucleophilic ring opening addition reaction of phenol groups towards oxazoline units has been used for the preparation of hyperbranched poly(ether amide)s. For this the AB2 monomer 2-(3,5-bishydroxyphenyl)-1,3-oxazoline was synthesized and converted in a highly branched polymer in bulk or solution at temperatures above 190°C. The resulting hyperbranched polymers exhibit a degree of branching of 50%, as verified by high-resolution NMR spectroscopy, and are highly soluble in polar organic solvents, for example DMF and DMAc, with low solution viscosity. Their glass transition temperatures are in the region of 170°C and degradation does not start below 300°C. Melt rheology measurements revealed a predominantly elastic behaviour with a relatively high viscosity at low frequency. A lower melt viscosity was achieved by end group modification. Hyperbranched poly(ether amide)s with phenolic and acetate end groups are fully miscible with linear polyamide 6. When a small amount of the hyperbranched material is added to the PA6 matrix a significant reduction of the melt viscosity could be achieved without changing the mechanical properties of the matrix polymer.
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Publisher
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High Performance Polymers
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Wikidata
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Citation
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High Performance Polymers 13 (2001) 21-31
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DOI
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https://doi.org/2/303
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Tags
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thermal polymerization aromatic polyamide glass-transition graft-copolymers end-groups polymers blends polyesters terephthalate-co-oxybenzoate)s polycondensation
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