Aramid regenerated short fibers, obtained from the production scrap of as-produced aramid yarns, were utilized as reinforcement in a commercial polyamide (PA12) at different contents, ranging from 10 wt% to 30 wt%, in order to evaluate the effect of the fiber loading on the mechanical and dynamic behaviour of the resulting materials. Differential scanning calorimetry tests revealed how the crystallinity slightly decreased with the fiber content, while quasi-static tensile tests evidenced that the introduction of aramid fibers provided an interesting stiffening effect on the resulting composites, proportionally to the filler content. On the other hand, the presence of agglomerated fibers led to an embrittlement of polyamide composites, with a progressive reduction of the deformation at break. Tensile dynamic tests confirmed the stabilizing effect provided by the recycled fibers, while the coefficient of linear thermal expansion was progressively reduced both under and above the glass transition temperature. Isothermal creep compliance of the material was substantially reduced upon fiber addition, especially at elevated testing temperatures. Accordingly, Vicat softening temperature was increased of 10-20 in dependence on the fiber content. Also, the thermal degradation stability was slightly improved upon fiber addition. Morphological analysis on the cryofractured surfaces revealed a quite good fiber-matrix interfacial adhesion

Effect of aramid regenerated fibers on thermo-mechanical behaviour of polyamide 12 composites

Dorigato, Andrea;Fambri, Luca
2013

Abstract

Aramid regenerated short fibers, obtained from the production scrap of as-produced aramid yarns, were utilized as reinforcement in a commercial polyamide (PA12) at different contents, ranging from 10 wt% to 30 wt%, in order to evaluate the effect of the fiber loading on the mechanical and dynamic behaviour of the resulting materials. Differential scanning calorimetry tests revealed how the crystallinity slightly decreased with the fiber content, while quasi-static tensile tests evidenced that the introduction of aramid fibers provided an interesting stiffening effect on the resulting composites, proportionally to the filler content. On the other hand, the presence of agglomerated fibers led to an embrittlement of polyamide composites, with a progressive reduction of the deformation at break. Tensile dynamic tests confirmed the stabilizing effect provided by the recycled fibers, while the coefficient of linear thermal expansion was progressively reduced both under and above the glass transition temperature. Isothermal creep compliance of the material was substantially reduced upon fiber addition, especially at elevated testing temperatures. Accordingly, Vicat softening temperature was increased of 10-20 in dependence on the fiber content. Also, the thermal degradation stability was slightly improved upon fiber addition. Morphological analysis on the cryofractured surfaces revealed a quite good fiber-matrix interfacial adhesion
17
Dorigato, Andrea; Fambri, Luca
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/35079
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 12
social impact