The Buffer Effect of Different Wood Species and the Influence of Oak on Panel Composites Binders

Policardi, Franco; Thébault, Marion

doi:10.3390/polym12071540

Cited by 10 publications

(5 citation statements)

References 27 publications

(30 reference statements)

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“…An average of 97 kJ/mol was observed for all conversions from 10% to 90 % of SS, which is close to the 104 kJ/mol calculated from the Kissinger model (Table ). The curing kinetics of thermosets tend to be complex in the presence of wood due to the chemical components present and buffering capacity of wood, but the plots of E a at different α can provide an understanding of the energy changes within the system as temperature increases . With the addition of 50 wt % 40-mesh wood fiber, E a showed a significant increase from 28 kJ/mol (40% α) to 73 kJ/mol (90% α) (Figure e).…”

Section: Resultsmentioning

confidence: 99%

“…The curing kinetics of thermosets tend to be complex in the presence of wood due to the chemical components present and buffering capacity of wood, but the plots of E a at different α can provide an understanding of the energy changes within the system as temperature increases. 38 With the addition of 50 wt % 40-mesh wood fiber, E a showed a significant increase from 28 kJ/mol (40% α) to 73 kJ/mol (90% α) (Figure 2e). A similar increase in E a was observed with 60 wt % wood around 40% α.…”

Section: Modulated Dynamic Scanning Calorimetry (Mdsc)mentioning

confidence: 96%

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Carbonation Curing and Kinetics of Wood-Sodium Silicate Composites

Orji,

Maughan,

McDonald

2024

ACS Sustainable Resour. Manage.

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In this study, carbon dioxide (CO 2 ) was sequestered in the curing of wood-sodium silicate (SS) composites. The effect of carbonation curing pressure, reaction time, wood fiber particle size, and post curing temperature on the thermal and mechanical properties of wood-SS composites was investigated. A mixture of 50 wt % wood (40 and 200-mesh) and SS was used to fabricate composites that were considered for carbonation curing. Dynamic rheological behavior of the blends during isothermal curing showed a higher complex viscosity for CO 2 -treated samples. X-ray microcomputed tomography (micro-CT) scans showed an increased CO 2 penetration depth with carbonation time and pressure. The %CO 2 uptake for wood-SS samples increased with the CO 2 exposure time and pressure. Curing kinetics of neat SS and wood-SS composites of different wood contents (50−70 wt %), examined using modulated dynamic scanning calorimetry (MDSC), showed activation energies ranged from 85 to 125 kJ/mol. The flexural properties of the 200-mesh wood-SS composites were higher with flexural modulus between 0.8 to 11.2 GPa and flexural strength between 3.5 to 59.2 MPa. Statistical response surface methodology showed that the CO 2 pressure and exposure time had significant effects on the mechanical properties of carbonated cured wood-SS composites.

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Section: Resultsmentioning

confidence: 99%

Section: Modulated Dynamic Scanning Calorimetry (Mdsc)mentioning

confidence: 96%

Carbonation Curing and Kinetics of Wood-Sodium Silicate Composites

Orji,

Maughan,

McDonald

2024

ACS Sustainable Resour. Manage.

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“…Another potential factor that could lower the IB reading for LL is the fact that it has higher buffering. The buffering slows down curing, especially when using MUF as a binder (Policardi and Thebault 2020). The significant IB reduction once the LL had been added indicates the need to modify the resin cures time prior to bonding.…”

Section: Effects Of Species and Mixingmentioning

confidence: 99%

“…Additional properties of buffer capacity and chemical composition of the wood was also looked at. Buffering capacities but has been shown to impact resin behaviour during curing process (Policardi and Thebault 2020).…”

Section: Introductionmentioning

confidence: 99%

Performance of particleboard made with Neolamarckia cadamba, Leucaena leucocephala, and their 50:50 Admixtures

Rahman

Yatim

Manshor

et al. 2022

BioRes

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The performance of a particleboard seems to be related to the chemical constituents of the species and the size distribution the particles. Neolamarckia cadamba (NC) and Leucaena leucocephala (LL) are fast growing species and good potential resources for particleboard production. This study examined the chemical contents of both species, as well as the mechanical and physical performance of particleboard made with 100% NC, 100% LL, and their 50:50 admixtures. High moisture resistance boards were prepared using melamine urea formaldehyde (MUF) at a content of 10, 12, and 14 %. The 30% extra buffering of LL translated to its lower performance for both mechanical and physical properties. The 50:50 admixtures provided enticing results, as it counteracts the impact of lowered performance of 100% LL. All boards passed the mechanical requirements of the BS EN 312 (2003) standard, but they did not meet the requirement for thickness swelling. The internal bond for cyclic test only failed for 100% LL with 10% resin added. With use of wax, the potential of improvement in swelling properties is possible.

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“…Policardi and Thebault [ 17 ] evaluated the buffer capacities of eight wood species in particleboard production. It was found that the buffer capacity of oak wood was rather extreme and concluded that it is possible to affect the ability of both melamine-urea formaldehyde and pure formaldehyde resin in industrial operation.…”

mentioning

confidence: 99%