Synthesis and characterization of novel organosoluble and thermally stable polyamides bearing triptycene in their backbones

A commercial organo-modified clay (OMC) was added to a polyamide 6 (PA6) matrix at various concentrations during the polymerization stage or by melt compounding in a twin-screw extruder, and the resulting pellets were used for the production of depth filters in the shape of cylindrical nonwoven webs through a melt-blown process. The processability of the investigated materials was significantly affected by nanofiller introduction. Differential scanning calorimetry revealed that OMCs play a nucleating effect on the crystallization of the polyamide matrix, with a remarkable increase in the crystallization temperature on cooling from the melt. Consequently, a parameter related to the filtering performances of the web, such as the pressure drop (ÁP) evaluated on cylindrical filters, decreased with the increase in die-to-collector distance in a more pronounced way for nanocomposite nonwovens. This behavior was related to the significant decrease of the connecting points in the networks due to the rapid cooling of the filaments on the collecting mandrel. Compressive mechanical tests evidenced how organoclay addition led to a remarkable increase of the rigidity of the web, when the data were compared at the same ÁP value, irrespectively from the preparation technique.

show abstract

“…[3]. Nowadays, polyamides (PAs) are widely utilized in fiber, film, packaging, and molding applications [4].…”

Section: Introductionmentioning

confidence: 99%

Thermal and mechanical behavior of innovative melt-blown fabrics based on polyamide nanocomposites

Dorigato

Brugnara

Giacomelli³

et al. 2014

Journal of Industrial Textiles

View full text Add to dashboard Cite

show abstract

“…Polyamides (PAs), also known as Nylon, are one of the most important commercial engineering plastics . From a chemical point of view, Polyamide 6 (PA6) is a linear polymer constituted by amide (—CONH—) repeating units, polymerized by the ring opening polymerization (ROP) of caprolactam (CPL).…”

Section: Introductionmentioning

confidence: 99%

Chain extension behavior and thermo-mechanical properties of polyamide 6 chemically modified with 1,1′-carbonyl-bis-caprolactam

Buccella

Dorigato

Pasqualini³

et al. 2013

Polym Eng Sci

View full text Add to dashboard Cite

A chain-extender based on 1,1 0 -Carbonyl-Bis-Caprolactam (CBC) was melt compounded with a commercial Polyamide 6 (PA6) by using a twin screw extruder. Rheological, thermal, and mechanical tests were performed on the resulting materials to evaluate the chain extension capability of CBC. Rheological tests on the compounded pellets and relative viscosity measurements on solubilized samples evidenced an increase of the viscosity values with the chain-extender amount, while the opposite trend was determined increasing the high temperature residence time. Terminal group analysis confirmed the increase of the molecular weight with the CBC content and highlighted a preferential reactivity of the chain-extender with aminic end groups. Differential scanning calorimetry (DSC) tests showed how both melting and relative crystallinity of the up-graded samples decreased with the CBC amount. Elastic and yield properties of chain-extended PA6 were similar to those of neat PA6 grades at different molecular weight, while crystallinity drop due to chain extension was responsible of an increase of the strain at break values. POLYM. ENG. SCI., 54:158-165, 2014. ª

show abstract

“…Hsiao et al [ 141 , 142 ], prepared a series of triptycene-based poly(amide-imide)s reacting 1,4-bis(4-trimellitimidophenoxy)triptycene, 1,4-bis(4-carboxyphenoxy)triptycene, and 1,4-bis(4-aminophenoxy)triptycene with aromatic diamines or dicarboxylic acids. Comparing structurally similar poly(amide-imide)s without triptycene motifs, enhanced solubility and film-forming ability, and lower crystallization were observed.…”

Section: Aromatic Polyamides With Selected Properties and Applicatmentioning

confidence: 99%

Functional Aromatic Polyamides

et al. 2017

View full text Add to dashboard Cite

Abstract: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.

show abstract

Synthesis and characterization of novel organosoluble and thermally stable polyamides bearing triptycene in their backbones

Cited by 32 publications

References 35 publications

Thermal and mechanical behavior of innovative melt-blown fabrics based on polyamide nanocomposites

Thermal and mechanical behavior of innovative melt-blown fabrics based on polyamide nanocomposites

Chain extension behavior and thermo-mechanical properties of polyamide 6 chemically modified with 1,1′-carbonyl-bis-caprolactam

Functional Aromatic Polyamides

Contact Info

Product

Resources

About