Dielectric studies of hyperbranched aromatic polyamide and polyamide-6,6 blends

The objective of this work was to study the interactions between polyamide‐6,6 (PA‐6,6) and hyperbranched (HB) polyamide with different functional end groups. The investigation focused on the thermal, dielectric, and viscoelastic properties of two kinds of HB polyamides, with amine and alkyl end gro...

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Bibliographic Details
Published in:Journal of applied polymer science 2005-08, Vol.97 (4), p.1522-1537
Main Authors: Hakme, C., Stevenson, I., Fulchiron, R., Seytre, G., Clement, F., Odoni, L., Rochat, S., Varlet, J.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed Matter
dielectric properties
Electrical, magnetic and optical properties
Exact sciences and technology
hyperbranched
Materials Science
Organic polymers
Physicochemistry of polymers
Physics
polyamides
Properties and characterization
relaxation
viscoelastic properties
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Summary:The objective of this work was to study the interactions between polyamide‐6,6 (PA‐6,6) and hyperbranched (HB) polyamide with different functional end groups. The investigation focused on the thermal, dielectric, and viscoelastic properties of two kinds of HB polyamides, with amine and alkyl end groups, prepared by a one‐pot process, in a polyamide‐6,6 matrix. Thermal analysis (by TGA and DSC) allowed us to observe decomposition and glass‐transition temperatures of these polymers. The melting point, crystallization temperature, and crystallinity ratio remained practically independent of HB content. Dielectric relaxation spectroscopy (DRS) showed two secondary relaxation (γ and β) and one primary (α) relaxation in the HB polymers and in the blends similar to those observed in polyamide‐6,6 with comparable activation energies and distribution parameters. An increase of the glass‐transition temperature was observed, showing a reinforcement of the polymer matrix and a decrease of the molecular mobility of the polyamide chains when the percentage of amine‐terminated HB polyamide increased in the matrix. DRS results found on the alkyl‐terminated HB polymer blend were indistinct from those of the polyamide‐6,6 matrix. Viscoelastic experiments confirmed the results observed in DRS. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 1522–1537, 2005
ISSN:0021-8995
1097-4628
DOI:10.1002/app.21907