The use of green materials such as natural fiber-reinforced composites represents an increasingly stringent prerogative in the future planning of industrial and non-industrial production. The optimization of these materials is the main aim of the current research, focused on the evaluation of the behavior of flax fiber reinforced composites exposed to isothermal adsorption and desorption cycles, at varying the partial pressure of water vapor (P/P0). For this purpose, the moisture uptake and the morphology changes of the composite material and their constituents were in situ monitored through a measurement protocol, by using a dynamic vapor sorption (DVS) analysis, coupled with an environmental scanning electron microscopy (ESEM) visual investigation. A dependence of moisture uptake and diffusivity on the composite morphology was clearly detected. In particular, no significant variation in the morphology of the specimen is noticed at low water vapor partial pressure (i.e., P/P0 up to 5.4%) due to the limited absorption capacity (i.e., lower than 1%). On the other hand, fibers morphology changes at increasing the partial pressure up to 25.1%, showing a sensitive increase in volume. This phenomenon becomes much more relevant for high relative humidity values (i.e., ~90%), reaching more than 6% of absorption capacity.

Calabrese L., Fiore V., Piperopoulos E., Badagliacco D., Palamara D., Valenza A., et al. (2022). In situ monitoring of moisture uptake of flax fiber reinforced composites under humid/dry conditions. JOURNAL OF APPLIED POLYMER SCIENCE, 139(16), 1-10 [10.1002/app.51969].

In situ monitoring of moisture uptake of flax fiber reinforced composites under humid/dry conditions

Fiore V.;Badagliacco D.;Valenza A.;
2022-04

Abstract

The use of green materials such as natural fiber-reinforced composites represents an increasingly stringent prerogative in the future planning of industrial and non-industrial production. The optimization of these materials is the main aim of the current research, focused on the evaluation of the behavior of flax fiber reinforced composites exposed to isothermal adsorption and desorption cycles, at varying the partial pressure of water vapor (P/P0). For this purpose, the moisture uptake and the morphology changes of the composite material and their constituents were in situ monitored through a measurement protocol, by using a dynamic vapor sorption (DVS) analysis, coupled with an environmental scanning electron microscopy (ESEM) visual investigation. A dependence of moisture uptake and diffusivity on the composite morphology was clearly detected. In particular, no significant variation in the morphology of the specimen is noticed at low water vapor partial pressure (i.e., P/P0 up to 5.4%) due to the limited absorption capacity (i.e., lower than 1%). On the other hand, fibers morphology changes at increasing the partial pressure up to 25.1%, showing a sensitive increase in volume. This phenomenon becomes much more relevant for high relative humidity values (i.e., ~90%), reaching more than 6% of absorption capacity.
Settore ING-IND/22 - Scienza E Tecnologia Dei Materiali
https://onlinelibrary.wiley.com/doi/10.1002/app.51969
Calabrese L., Fiore V., Piperopoulos E., Badagliacco D., Palamara D., Valenza A., et al. (2022). In situ monitoring of moisture uptake of flax fiber reinforced composites under humid/dry conditions. JOURNAL OF APPLIED POLYMER SCIENCE, 139(16), 1-10 [10.1002/app.51969].
File in questo prodotto:
File Dimensione Formato  
2022_In situ monitoring of moisture uptake of flax fiber reinforced composites under humid-dry conditions.pdf

accesso aperto

Tipologia: Versione Editoriale
Dimensione 2.14 MB
Formato Adobe PDF
2.14 MB Adobe PDF Visualizza/Apri

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: http://hdl.handle.net/10447/525916
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 0
social impact