Flame Inhibition and Charring Effect of Aromatic Polyimide and Aluminum Diethylphosphinate in Polyamide 6

An aromatic macromolecular polyimide (API) was synthesized and characterized, and used as a synergistic charring flame retardant in glass fiber reinforced polyamide 6 (GF/PA6). API and aluminum diethylphosphinate (ADP) exhibited better flame inhibition behavior and synergistic charring flame retardant behavior compared with ADP alone. The 5%API/7%ADP/GF/PA6 sample achieved the lower peak value of the heat release rate (pk-HRR) at 497 kW/m² and produced higher residue yields of 36.1 wt.%, verifying that API and ADP have an outstanding synergistic effect on the barrier effect. The API/ADP system facilitated the formation of a carbonaceous, phosphorus and aluminum-containing compact char layer with increased barrier effect. FTIR spectra of the residue and real-time TGA-FTIR analysis on the evolved gases from PA6 composites revealed that API interacted with ADP/PA6 and locked in more P⁻O⁻C and P⁻O⁻Ar content, which is the main mechanism for improving flame inhibition and charring ability. In addition, the API/ADP system improved the mechanical properties and corrosion resistance of GF/PA6 composites compared to ADP alone.

Functional Aromatic Polyamides

We describe herein the state of the art following the last 8 years of research into aromatic polyamides, wholly aromatic polyamides or aramids. These polymers belong to the family of high performance materials because of their exceptional thermal and mechanical behavior. Commercially, they have been transformed into fibers mainly for production of advanced composites, paper, and cut and fire protective garments. Huge research efforts have been carried out to take advantage of the mentioned characteristics in advanced fields related to transport applications, optically active materials, electroactive materials, smart materials, or materials with even better mechanical and thermal behavior.

Effects of a trans- or cis-cyclohexane unit on the thermal and rheological properties of semi-aromatic polyamides

Polyamides containing trans-formation cyclohexane unit was found to have better physical performance than that of sample with cis-formation such as mechanical, thermal and oxidation resistance properties etc.

Chitosan and imide-functional Fe3O4 nanoparticles to prepare new xanthene based poly(ether-imide) nanocomposites

In this work a new series of multifunctional nanocomposites were synthesized based on a soluble poly(ether-imide).

Preparation and properties of nylon 6/sulfonated graphene composites by an in situ polymerization process

Nylon 6/sulfonated graphene composites with high thermal conductivity, good mechanical properties and excellent processability were prepared using sulfonated graphene as a precursor by an in situ polymerization process.

Investigation of the synthesis and properties of isophorone and ether units based semi-aromatic polyamides

The resultant semi-aromatic polyamides showed excellent melt processability and mechanical, thermal and optical properties.

Development of one-step synthesized LDH reinforced multifunctional poly(amide–imide) matrix containing xanthene rings: study on thermal stability and flame retardancy

New exfoliated poly(amide–imide)/Zn–Al layered double hydroxide (LDH) nanocomposites were synthesized by solution intercalation using synthesized organo-modified LDH (OLDH) as nanofiller obtained by one-step method.

Synthesis and properties of star-branched nylon 6 with hexafunctional cyclotriphosphazene core

A novel star-branched nylon 6 was synthesized using hexa(4-carboxylphenoxy)cyclotriphosphazene as the core. Star-branching structure and molecular weight have great effects on its properties.

Semiaromatic polyamides containing ether and different numbers of methylene (2–10) units: synthesis and properties

The resultant semi-aromatic polyamides showed excellent mechanical, processability, thermal and retardant property.