Effect of sea water on water absorption and flexural properties of wood-polypropylene composites

Najafi, Saeed Kazemi; Kordkheili, Hamed Younesi

doi:10.1007/s00107-010-0518-7

Cited by 25 publications

(7 citation statements)

References 11 publications

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“…Compared with pure rice straw-plastic composite, the creep property of rice straw-plastic composite decreased by 25%. The addition of carbon fiber can reduce the deformation of rice straw-plastic composite (Park and Balatinecz 1998;LabVIEW User Manual 2000;Lee and Kim 2008;Yang et al 2007;Najafi and Kordkheili 2011;Tang et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Study on the effect of carbon fiber addition on the properties of rice straw-plastic composites

Xuesong

Zhou

Pan

et al. 2021

BioRes

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Short carbon fiber (SCF), rice straw powder, and high-density polyethylene (HDPE) were melted, mixed, and compounded into composites by compression molding. The effects of carbon fiber content on the mechanical properties of rice straw-high density polyethylene composites (RHCs) were studied. The carbon fibers were characterized by a universal capability test machine (UCTM), scanning electron microscope (SEM), DMA dynamic mechanical analyzer, and a Fourier infrared spectrometer. The results showed that the addition of carbon fiber was beneficial to reduce the creep of RHCs. Meanwhile, the carbon fibers were broken after strength testing. The functional group types of rice straw WPC composites did not change, and the skeleton structure of WPC materials was still retained. When the content of carbon fibers was 9%, a large number of carbon fibers were surrounded by the HDPE matrix; the fibers were broken and rarely pulled out. The results showed that good interfacial bonding took place between the carbon fibers and the composites. The maximum tensile strength of the RHC/S9 was 15.15 MPa, which was 20.7% higher than that of default RHC, and the modulus of elasticity was 52.5% higher than that of default RHC. However, due to the large content of carbon fiber, the distribution of the carbon fibers was uneven in the matrix, and the toughness was reduced.

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Section: Discussionmentioning

confidence: 99%

Study on the effect of carbon fiber addition on the properties of rice straw-plastic composites

Xuesong

Zhou

Pan

et al. 2021

BioRes

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“…There exists some literature on the behaviour of NFRP composites in marine environment. [30][31][32][33][34] Fragassa et al 35 studied the effect of seawater absorption on the flexural properties of flax reinforced vinylester composites. They concluded that due to seawater aging, the flexural strength and modulus were reduced with an increase in flexural strain due to the reduction in the brittle nature of composites.…”

Section: Introductionmentioning

confidence: 99%

Effect of ocean water absorption on flexural properties of Cannabis sativa L. hemp fibre reinforced polymer composites for marine applications

Jasti

Biswas

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Hemp is one of the strongest and most durable commercially available natural fibre. Its biodegradability, low density, high fibre length, availability, low weight-to-strength ratio and more yield per acre makes it an ideal fibre for marine applications. Water absorption behaviour of any material is very important which mainly limits their use specifically in marine applications. The present work aims to study the absorption of ocean water, its kinetics and effects on the flexural properties of hemp reinforced composites. Absorption effects for epoxy and unsaturated polyester (UPE) reinforced with short hemp fibre, unidirectional and bidirectional hemp fabric were investigated by immersing samples in ocean and distilled water. The absorption of all composites followed Fickian diffusion with slight deviation due to swelling of fibres and formation of microcracks. It is observed that the water uptake of samples increased with increasing weight fraction. The flexural strength and modulus of composites degraded by approximately 10% and 20% for epoxy and UPE composites respectively, due to water absorption. The results indicated that hemp fibre based composites could be used for many lightweight components in marine applications.

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“…The effect of moisture on the physicochemical properties of wood‐based composites has been studied by researchers. [ 13,14 ] The mechanical properties of wood‐based composites, such as strength, tensile modulus, flexural modulus, and hardness, decrease with increasing water immersion time. Hence, wet treatment can be used to assess the durability of wood‐based composites.…”

Section: Introductionmentioning

confidence: 99%

Effects of wet treatment on bonding strength and electrothermal performance of electrothermal plywood bonded with emulsion polymer‐isocyanate adhesive

et al. 2022

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To create a green, safe, and aldehyde-free indoor heating environment, an eco-friendly emulsion polymer-isocyanate (EPI) adhesive was applied to the preparation of electrothermal plywood with built-in carbon fiber paper. The optimized process parameters of electrothermal plywood were 0.9 MPa, 120 C, 6 min, and 200 g/m 2 for hot-pressing pressure, temperature, time, and glue spread amount, respectively. After water immersion for 24 h, the bonding strength of wet-treated electrothermal plywood decreased to 0.89 MPa. The pull-out cracks of the carbon fiber paper were the main fracture form of the wet-treated electrothermal plywood, and the wood failure percentage was 0%-10% under the tensile load. Hydrolysis of the adhesive layer of the wettreated electrothermal plywood occurred. The relative C and N contents in the wet-treated electrothermal plywood decreased by 6.1% and 25.3%, respectively.Moreover, the resistance of the wet-treated electrothermal plywood increased by 273.4% because the internal conductive path was interrupted during the intrusion of the water molecules. The highest electric-to-radiant transfer efficiency of the electrothermal plywood was 72.4%, with a power density of 200 W/m 2 . In conclusion, wet treatment has a significant effect on the bonding strength and electrothermal performance of the electrothermal plywood bonded with EPI adhesive.

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Effect of sea water on water absorption and flexural properties of wood-polypropylene composites

Cited by 25 publications

References 11 publications

Study on the effect of carbon fiber addition on the properties of rice straw-plastic composites

Study on the effect of carbon fiber addition on the properties of rice straw-plastic composites

Effect of ocean water absorption on flexural properties of Cannabis sativa L. hemp fibre reinforced polymer composites for marine applications

Effects of wet treatment on bonding strength and electrothermal performance of electrothermal plywood bonded with emulsion polymer‐isocyanate adhesive

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