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

Abstract

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.

Novel electroactive polyamide 12 based nanocomposites filled with reduced graphene oxide

“…It is evident that both the melting and the crystallization temperatures ( T m , T c ) of the materials are not significantly affected by the presence of nanofillers, while the crystallinity degree is slightly impaired by rGO addition. Contrarily to what observed in our paper on PA12 based nanocomposites and on PBT/organoclay nanocomposites , in the present case nanofiller addition does not play nucleating role for the crystallization processes.…”

“…An interesting industrial perspective is represented by the possibility to utilize non‐woven polyamide 12 fabrics produced through spunbond or meltblown technology as air/liquid filters in automotive applications . A similar operation has been already conducted by our group in the preparation of melt‐blown filters based on organo‐modified clay (OMC)‐PA6 nanocomposites . On the basis of these considerations, in this work innovative PA12 based nanocomposites filled with different amounts of reduced graphene oxide were investigated.…”

Multifunctional glass fiber/polyamide composites with thermal energy storage/release capability

“…Interestingly, the crystallization temperature of PA12 matrix is increased of about 5°C in the ParCNT based blends. As already observed in our previous papers on polyamide 6-clay nanocomposites [62], this is probably due to the nucleating effect played by CNTs within the matrix. The paraffin leakage/degradation effect is visible also in the TGA results, reported in Figure 3 and in Table 4.…”

Structure and Properties of Polyamide 11 Nanocomposites Filled with Fibrous Palygorskite Clay

“…In fact, both the crystallization temperature (Tc) and the crystallinity degree (Xc) are slightly increased upon nanofiller addition. A similar result was already detected by Dorigato et al on PA6 nanocomposites [34]. TGA in nitrogen atmosphere was carried out in order to investigate the thermal stability of the PA11 nanocomposites filled with different PLG loadings.…”