Structural characterization of sepiolite/polyamide6,6 nanocomposites by means of static and dynamic thermal methods

Clay Polymer Nanocomposites (CPN) are hybrid materials with improved technical characteristics with respect to the counterparts. Polyamide6,6 (PA66) is one of the most widely used as matrix. The α structure (triclinic) undergoes into the γ structure (pseudohexagonal) in a solid-to-solid transition w...

Full description

Saved in:
Bibliographic Details
Published in:Applied clay science 2018-03, Vol.153, p.154-160
Main Authors: Fernandez-Barranco, Cristina, Kozioł, Anna E., Drewniak, Marek, Yebra-Rodriguez, Africa
Format: Article
Language:English
Subjects:
Clay polymer nanocomposites
Microstructural analysis
Polyamide
Sepiolite
Thermal analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Clay Polymer Nanocomposites (CPN) are hybrid materials with improved technical characteristics with respect to the counterparts. Polyamide6,6 (PA66) is one of the most widely used as matrix. The α structure (triclinic) undergoes into the γ structure (pseudohexagonal) in a solid-to-solid transition when exposed to high temperatures. In recent years, sepiolite (Sep) has been used as reinforcing agent in polymer matrix as it enhances thermal properties of the nanocomposites without modification in the hydrogen bonds between PA66 chains. In this work we provide information about the structural changes occurring in neat PA66 and Sep/PA66 nanocomposites after the degradation process through a thermo-dynamic study combined with X-ray diffraction methods. In injection molded Sep/PA66 nanocomposites the sepiolite fibres locate between the polymer lamellae in a sloping suitable position, without involving large distortions in the lattice of PA66. Due to organophilization, no changes are induced by the sepiolite in the nanocomposite structure. The PA66…Sep contact promotes the occurrence of the CH…O hydrogen bonds in the typical reticulated structure between the sepiolite fibres and the polyamide chains, which renders thermal sability to the polymer crystals up to 150°C. [Display omitted] •The sepiolite…polyamide6,6 contact promotes the occurrence of the CH…O hydrogen bonds.•In Sep/PA66 CPN the fibres locate between the polymer lamellae in a sloping suitable position.•The sepiolite fibres do not involve large distortions in the lattice of polyamide6,6.
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2017.12.025