PET Fibers Modified with Cloisite Nanoclay

Area of Science:

• Materials Science
• Polymer Chemistry
• Textile Engineering

Background:

• Polyethylene terephthalate (PET) fibers are widely used but exhibit flammability.
• Developing effective flame-retardant treatments for PET is crucial for safety applications.
• Existing methods may have limitations in terms of efficiency or environmental impact.

Purpose of the Study:

• To investigate the flame-retardant properties of PET fibers modified with organophilic montmorillonite (Cloisite®15A).
• To assess the impact of this modification on the thermal stability and combustion behavior of PET fibers.
• To confirm the nanocomposite structure and evaluate the toxicity of degradation products.

Main Methods:

• Modification of PET fibers using a high-temperature bath method with Cloisite®15A.
• Flame retardancy assessment via Limiting Oxygen Index (LOI) measurements.
• Thermal stability analysis using Thermogravimetric Analysis (TGA).
• Evolved Gas Analysis (EGA) via Fourier-Transform Infrared Spectroscopy (FTIR) coupled with TGA.
• Structural characterization using Wide-Angle X-ray Scattering (WAXS) and Small-Angle X-ray Scattering (SAXS).

Main Results:

• The addition of Cloisite®15A significantly improved the flame-retardant properties of PET fibers, as indicated by LOI measurements.
• TGA revealed enhanced thermal stability of the modified PET fibers.
• EGA-FTIR confirmed that the combustion of modified fibers did not produce more toxic volatile degradation products.
• WAXS and SAXS analyses confirmed the formation of a nanocomposite structure within the PET fibers.

Conclusions:

• Organophilic montmorillonite (Cloisite®15A) is an effective flame retardant for PET fibers.
• The modification process enhances flame retardancy and thermal stability without increasing toxicity.
• The resulting modified fibers possess a confirmed nanocomposite structure.