Improvement of Water Resistance of Hemp Woody Substrates through Deposition of Functionalized Silica Hydrophobic Coating, While Retaining Excellent Moisture Buffering Properties

Jiang, Yunhong; Bourebrab, Marion A.; Sid, Nadia; Taylor, Alan R.; Collet, Florence; Prétot, Sylvie; Hussain, Atif; Ansell, Martin P.; Lawrence, Michael B.

doi:10.1021/acssuschemeng.8b01475

Cited by 21 publications

(6 citation statements)

References 168 publications

(261 reference statements)

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“…Therefore, there is a need to develop new hemp based composites to address the existing issues as well as to retain the maximum insulating and moisture buffering properties of the bio-based aggregate. The use of silica based coatings on hemp shiv has proven to be successful in enhancing its hydrophobicity [19,20]. Application of silica based coatings have successfully shown to lower the water absorption capacity of hemp shiv yet retaining its moisture buffering ability due to presence of small pores that are not blocked by the coating [21,22].…”

mentioning

confidence: 99%

Hygrothermal and mechanical characterisation of novel hemp shiv based thermal insulation composites

Hussain

Calabria-Holley

Lawrence

et al. 2019

Construction and Building Materials

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mentioning

confidence: 99%

Hygrothermal and mechanical characterisation of novel hemp shiv based thermal insulation composites

Hussain

Calabria-Holley

Lawrence

et al. 2019

Construction and Building Materials

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“…Silica and TEOS are coating material compositions, applied to the surface treatment of hemp fiber composites. Then the result of this study found that the water contact angle is 120℃ [11] . This study aims to determine the physical and mechanical properties of rice straw hydrophobic composites and the effect of volume fraction and alkalization treatment on fiber.…”

Section: Introductionmentioning

confidence: 81%

“…While the surface that has been coated with a hydrophobic layer has little contact between water and the substrate. Water droplets on the surface of the straw epoxy hydrophobic composite have a water contact angle more than 90 o C which is the minimum contact angle value for a hydrophobic surface [11] . In the roll coating method, it seems to be able to hold water droplets and no droplets seep.…”

Section: Cellulose Contentmentioning

confidence: 96%

The Effect of Volume Fraction and Alkalization Treatment on Characteristic of Straw-Epoxy Hydrophobic Composites with Coating Method

Prastuti,

Martak,

Kurniati

et al. 2024

MSF

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The rapid development of the timber industry has caused the total capacity of the Indonesian timber industry to exceed the ability of production forests to provide raw materials sustainably. One of the industries that require a supply of wood as its main raw material is the furniture industry. The raw materials for furniture that are commonly used are logs and planks. In recent years, there has been the development of new materials that use natural fibers as polymer reinforcement, which can be used to replace wood materials. The material is a natural fiber composite. Composite materials reinforced with natural fibers are widely used in aerospace, automotive, circuit boards and other applications. One of the natural fibers that can be used as a composite is straw fiber. This high proportion of cellulose in straw fiber can be used for several things, one of which is composite materials. The utilization of rice straw fiber and epoxy as raw materials for making composites is an alternative to overcoming the increasing demand for wood. The purpose of this study was to determine and analyze the effect of volume fraction and alkalization treatment on the physical and mechanical characteristics of straw fiber composites, also to determine and analyze the effect of adding a coating of PE/SiO2 on the hydrophobic characteristics of straw fiber composites. The physical and mechanical properties of the composites were evaluated based on the SNI 03-2059-2006 and SNI-01-4449-2006 standard. The volume fractions used are 40%, 50%, and 60%. The length of the fiber used is 5 mm. And the alkalization variables used were 5% and 10% NaOH with 4 and 8 hours of immersion. The compressive strength decreased by adding fiber volume fraction and increased by higher treatment alkalization. The coating method can produce composite with the contact angle value of more than 90o.

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“…The readings were taken at frequent intervals for 24 hours, in which the sample was taken out of water using a tweezer, shaken off to remove any visible surface water and then weighed within 30s. Mass readings were recorded to the nearest 0.1 mg and an average of three readings from different samples was reported as the final measurement [24,25].…”

Section: Water Absorption Testmentioning

confidence: 99%

Resilient hemp shiv aggregates with engineered hygroscopic properties for the building industry

Hussain

Calabria-Holley

Lawrence

et al. 2019

Construction and Building Materials

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This study focuses on the surface treatment of an extremely hydrophilic natural plant material, hemp shiv, using a functionalised silica based coating to provide hydrophobicity while retaining its moisture buffering ability. The chemical composition and physical structure of bio-based materials results in their extremely hydrophilic behaviour. In this work, a simple one step coating process was used to enhance the water-repellence of hemp shiv without compromising its ability to adsorb and release moisture. The coating modified the morphology and surface roughness of hemp shiv providing a hydrophobic surface having a water contact angle of 118° and reduced the bulk water absorption by 250% over 24 hours. Mercury intrusion porosimetry (MIP) showed that the treatment refined the pore size distribution of hemp shiv, reducing the size of larger pores but not completely blocking the smaller pores thereby allowing hemp shiv to buffer moisture. Fourier-transform infrared spectroscopy (FTIR) revealed the chemical composition was modified by the coating, reducing the hydroxyl groups. Hemp shiv aggregates treated with functionalised silica based coating show potential for the development of robust lightweight building materials with enhanced hydrophobicity.

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Improvement of Water Resistance of Hemp Woody Substrates through Deposition of Functionalized Silica Hydrophobic Coating, While Retaining Excellent Moisture Buffering Properties

Abstract: degree qualification. I confirm that the work is my own, and where some work was carried out as part of a collaborative project, contributors are explicitly mentioned and acknowledged.

Cited by 21 publications

References 168 publications

Hygrothermal and mechanical characterisation of novel hemp shiv based thermal insulation composites

Hygrothermal and mechanical characterisation of novel hemp shiv based thermal insulation composites

The Effect of Volume Fraction and Alkalization Treatment on Characteristic of Straw-Epoxy Hydrophobic Composites with Coating Method

Resilient hemp shiv aggregates with engineered hygroscopic properties for the building industry

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