The effect of environmental humidity/water absorption on tribo-mechanical performance of polymers and polymer composites – a review
| Autor: | Ashwin D. Patel, Kawaljit Singh Randhawa |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Absorption of water Materials science Mechanical Engineering Environmental humidity Humidity 02 engineering and technology Polymer Tribology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films General Energy chemistry Polymer composites Composite material 0210 nano-technology Thermoplastic polymer |
| Zdroj: | Industrial Lubrication and Tribology. 73:1146-1158 |
| ISSN: | 0036-8792 |
| DOI: | 10.1108/ilt-02-2021-0045 |
| Popis: | Purpose The mechanical and tribological properties of polymers and polymer composites vary with different environmental conditions. This paper aims to review the influence of humidity/water conditions on various polymers and polymer composites' mechanical properties and tribological behaviors. Design/methodology/approach The influence of humidity and water absorption on mechanical and tribological properties of various polymers, fillers and composites has been discussed in this paper. Tensile strength, modulus, yield strength, impact strength, COF and wear rates of polymer composites are compared for different environmental conditions. The interaction between the water molecules and hydrophobic polymers is also represented. Findings Pure polymer matrices show somewhat mixed behavior in humid environments. Absorbed moisture generally plasticizes the epoxies and polyamides and lowers the tensile strength, yield strength and modulus. Wear rates of PVC generally decrease in humid environments, while for polyamides, it increases. Fillers like graphite and boron-based compounds exhibit low COF, while MoS2 particulate fillers exhibit higher COF at high humidity and water conditions. The mechanical properties of fiber-reinforced polymer composites tend to decrease as the rate of humidity increases while the wear rates of fiber-reinforced polymer composites show somewhat mixed behavior. Particulate fillers like metals and advanced ceramics reinforced polymer composites exhibit low COF and wear rates as the rate of humidity increases. Originality/value The mechanical and tribological properties of polymers and polymer composites vary with the humidity value present in the environment. In dry conditions, wear loss is determined by the hardness of the contacting surfaces, which may not effectively work for high humid environments. The tribological performance of composite constituents, i.e. matrix and fillers in humid environments, defines the overall performance of polymer composite in said environments. |
| Databáze: | OpenAIRE |
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