Epoxy–silica composites replicating wood cell structure

Daud, Norlinda; Shanks, Robert A.

doi:10.1016/j.compositesa.2014.03.013

Cited by 12 publications

(9 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The organic polymers often specified as impregnants (acrylic, polyurethanic, epoxy, etc.) usually block the pores decreasing the coefficient of capillary water absorption and the water vapor permeability; the latter limits the drying kinetics [11] [12].…”

Section: Introductionmentioning

confidence: 99%

Low Density Wood Impregnation with Water-Repellent Organosilicic Compounds

Canosa¹,

Alfieri²,

Giúdice³

2018

MSCE

View full text Add to dashboard Cite

Many protective treatments for low density wood are applied by impregnation to give water-repellency and to control pathologies that usually have this substrate. The properties of Araucaria angustifolia, chemically modified by impregnation with methyltriethoxysilane, n-octyltriethoxysilane and mixtures of both in several ratios, were investigated to achieve mainly high dimensional stability, low capillary water absorption as well as satisfactory water vapor permeability. The aforementioned impregnants produce the wood chemical modification, involving the reaction of hydroxyl groups of the wood with the hydrolysis products of alcoxysilanes. It is concluded that the organosilicon polymers allow improving important characteristics of wood: 1) the non-occlusive coating keeps the water vapor permeability unaltered; 2) the alkoxysilane type defines the hydrophobicity and the continuity of coating formed on the pore wall and finally; 3) the polymeric structure formed after finishing sol-gel process incises both on the capillary water absorption and the dimensional stability. In addition, the studied treatments have the advantage of allowing that the water vapor, which permeates through the organosilicon coating placed on cell wall, can exit by hydrophobic repulsion and thus, prevent faults appearance generated by the condensed water inside of wood.

show abstract

Section: Introductionmentioning

confidence: 99%

Low Density Wood Impregnation with Water-Repellent Organosilicic Compounds

Canosa¹,

Alfieri²,

Giúdice³

2018

MSCE

View full text Add to dashboard Cite

show abstract

“…Las fibras de celulosa garantizan la resistencia de la madera y la lignina estabiliza las fibras en la estructura del material [8,13,15]. Es además un material compuesto homogéneo a nivel macroscópico y heterogéneo a nivel microscópico.…”

Section: Introductionunclassified

“…Entre mayor es el tamaño del nudo, mayor será la pérdida de capacidad resistente de las vigas de madera maciza. Para aumentar la capacidad resistente de las vigas de madera y al mismo tiempo reducir el efecto de las alteraciones físicas tenemos la madera laminada Glulam y los refuerzos naturales y sintéticos [1,5,[6][7][8][9][10][11][12][13][14][15]. La madera laminada Glulam es una técnica que permite minimizar los efectos de los nudos, del ángulo de microfibrillas y de la heterogeneidad natural existente en las vigas de madera maciza.…”

Section: Introductionunclassified

Vigas de madera laminada Glulam reforzadas con pletinas metálicas dentadas

Cañola

Echavarría

2018

DYNA

View full text Add to dashboard Cite

This article presents an analysis of the mechanical properties of Glulam beams reinforced with punched metal plates. In this study, two groups of Glulam beams were fabricated and experimentally analyzed: 30 non reinforced Glulam beams and 30 Glulam beams reinforced with punched metal plates. All Glulam beams were made of Carbonero (Licania campestre) and an epoxy adhesive with high strength and durability. Four-point bending tests in the 60 full-scale beams were carried out. Then, a model based on linear elasticity theory was used to calculate the strength and verify the experimental results. It was determined that Glulam beams reinforced with punched metal plates show a better mechanical behavior than non reinforced Glulam beams. It was further established that the use of punched metal plates increases the homogeneity and the mechanical capacity of Glulam beams.Keywords: wood; Glulam; punched metal plates; bending test.Vigas de madera laminada Glulam reforzadas con pletinas metálicas dentadas ResumenEn este artículo se estudian las propiedades mecánicas de vigas de madera laminada Glulam reforzadas con pletinas metálicas dentadas. Se fabricaron y analizaron experimentalmente 2 grupos de vigas: 30 vigas de madera laminada no reforzadas y 30 vigas de madera laminada reforzadas con pletinas metálicas dentadas. Todas las vigas de madera laminada se fabricaron con planchas de Carbonero (Licania campestre) y un adhesivo epóxico de alta resistencia y durabilidad. Se ejecutaron ensayos de flexión de cuatro puntos en las 60 vigas a escala natural. Para determinar las tensiones, se usó un modelo teórico linealmente elástico y se verificaron los resultados experimentales. Se determinó que las vigas de madera laminada reforzadas presentan un mejor comportamiento mecánico que las vigas de madera laminada no reforzadas. Se estableció además que el uso de las pletinas metálicas dentadas aumenta la homogeneidad y la capacidad resistente de las vigas de madera laminada.Palabras clave: madera; Glulam; pletinas metálicas dentadas; ensayo de flexión.

show abstract

“…Grafting is a well‐established method for the chemical modification of surfaces, which means there are many possible applications of great interest. The method has been recently applied to: production of antifungal cellulose by grafting of capsaicin ; textiles with biocidal activity by introducing insecticide into cotton via grafted glycidyl methacrylate ; composites replicating wood by grafting of epoxy‐silica onto the wood cell wall ; composites of glycidyl methacrylate (GMA) and water hyacinth fibers for application as adsorbents of metals or organic compounds ; starch grafted with epoxy polymer for use as a drug release ; and also to prepare composites of wood pulp cellulose fibers and poly(ethyl acrylate) for new synthetic‐natural hybrid materials for usage in paper products .…”

Section: Introductionmentioning

confidence: 99%

Pinewood Composite Prepared byIn SituGraft Polymerization of Epoxy Monomer

Mattos

Missio

Cademartori³

et al. 2015

Polym. Compos.

View full text Add to dashboard Cite

Composites were prepared by graft polymerization of glycidyl methacrylate (GMA) into low-quality Brazilian pinewood. Oven-dried pinewood samples were impregnated with GMA (1.5 wt% of benzoyl peroxide as catalyst), polymerized by heat at 908C for 10 h, and washed with acetone to leach the unreacted chemicals. The characterization was performed by treatability parameters, scanning electron microscopy images, ATR-IR spectroscopy, TGA, differential scanning calorimetry (DSC), mechanical properties, water uptake and dimensional stability measurements, and decay resistance tests. The main results showed that the conversion of monomers into grafted polymers was high-up to 85%. The graft polymerization was confirmed by reduction (~158C lower) in the temperature of the main thermal event via DrTG and DSC. A decrease in OH band and an increase of peaks corresponding to C@O and CAO bonds in ATR-IR also confirmed the grafting. The hygroscopicity and wetting were reduced 10 times, dimensional stability improved about 70%, and mechanical properties improved between 55 and 85% after the graft polymerization. Decay resistance also increased both against brown and white rot fungi.

show abstract

Epoxy–silica composites replicating wood cell structure

Cited by 12 publications

References 11 publications

Low Density Wood Impregnation with Water-Repellent Organosilicic Compounds

Low Density Wood Impregnation with Water-Repellent Organosilicic Compounds

Vigas de madera laminada Glulam reforzadas con pletinas metálicas dentadas

Pinewood Composite Prepared byIn SituGraft Polymerization of Epoxy Monomer

Contact Info

Product

Resources

About