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Understanding the effect of moisture variation on the hygromechanical properties of porosity-controlled nonwoven biocomposites
- Source :
- Polymer Testing, Polymer Testing, Elsevier, 2019, 78, pp.105944-. ⟨10.1016/j.polymertesting.2019.105944⟩
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- This study investigates the evolution of hygromechanical properties of flax/PP nonwoven composites in a wide range of environmental Relative Humidity (RH) conditions from 10 to 98% RH. The influence of microstructure with various porosity content ( Φ = 5, 30, 50%) on the mechanical and hygroscopic behaviours is studied and compared to glass/PP composites as a baseline. No significant changes in the moisture content and mechanical properties of glass-fibre reinforced composites are observed. For flax fibre nonwoven composites, the porosity greatly impacts the kinetic of sorption with moisture saturation varying from 9 h to 15 days with decreasing voids. Hygroscopic expansion is hardly modified by the porosity content while anisotropic expansion is always observed. Tensile behaviour and properties are slightly changed over a range of 10–75%RH but negatively impacted between 75% and 98% RH. Interestingly, unlike the tangent tensile modulus and strain at rupture of flax/PP composites, the yield strength exhibits a non-monotonic trend with an optimal value over 50% RH; compressive stresses at the fibre/matrix interface induced by flax fibres hygroexpansion are proposed to explain this trend.
- Subjects :
- Materials science
Polymers and Plastics
Moisture
Organic Chemistry
Young's modulus
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
0104 chemical sciences
symbols.namesake
[SPI]Engineering Sciences [physics]
Ultimate tensile strength
symbols
Relative humidity
Composite material
0210 nano-technology
Saturation (chemistry)
Porosity
Water content
Subjects
Details
- Language :
- English
- ISSN :
- 01429418
- Database :
- OpenAIRE
- Journal :
- Polymer Testing, Polymer Testing, Elsevier, 2019, 78, pp.105944-. ⟨10.1016/j.polymertesting.2019.105944⟩
- Accession number :
- edsair.doi.dedup.....136722bcfb414188d49096c0f7249196