A comparative study of resins for the consolidation of wooden objects

Nakhla, Sam

doi:10.1179/sic.1986.31.1.38

Cited by 23 publications

(7 citation statements)

References 2 publications

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“…From the FTIR results, one would infer that the higher the concentration of the PVBVA solution, the thicker the coating, and when the treatment method was brushing, thicker polymeric coatings were also obtained, at least when solutions of 5% and 10% of PVBVA were used. The band at 1240 cm −1 associated with the vibration mode of the acetate group [ 9 , 10 ] also appeared after the treatment, as expected, taking into account that this group formed part of the PVBVA structure ( Figure 1 ). Finally, in the modified samples, the absorption band at 1377 cm −1 , which corresponded to the CH 3 bending mode of the PVBVA [ 44 ], was also observed, evidencing the presence of PVBVA after the surface treatments.…”

Section: Resultssupporting

confidence: 75%

“…Polymers have been extensively used on wooden surfaces [ 1 , 5 , 6 ], including epoxy and polyester resins [ 5 ], polyurethanes [ 7 ], cellulose derivatives [ 8 ], and a wide range of thermoplastic polymers [ 9 , 10 ]. Within these, two of the most widely used due to their good optical properties are acrylate-based polymers, such as Paraloid B72 [ 11 , 12 , 13 , 14 , 15 ], and those derived from polyvinyl butyral (PVB) [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Consolidation of Fir Wood by Poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) Treatment: Study of Surface and Mechanical Characteristics

2020

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The ability of poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) (PVBVA) to consolidate Fir wood was studied in terms of the surface and mechanical properties’ changes. Two variables were considered to treat the wood: (i) the concentration (5 and 10 wt.%) of PVBVA solutions and (ii) the method of application (brushing and immersion). The presence of PVBVA on the wood surfaces was confirmed by infrared spectroscopy. Surface roughness measured by optical profilometry did not reveal changes in the topography of the samples, and appropriate visual appearance was confirmed. Contact angle measurements showed that a droplet of the 10%-PVBVA solution needed ~50 s to reach the same contact angle decreasing rate as that measured for the 5%-PVBVA solution, suggesting there was some kind of induction time till the spreading process was no longer controlled by the viscosity, but by the solution-wood interactions. Water contact angle (WCA) measurements proved a more hydrophobic surface of the PVBVA-treated samples, compared to untreated wood. Mechanical characterization of the samples was done macroscopically by a three-point bending test and locally by the Shore D and Martens hardness (MH). Only results from MH experiments provided comparative results, indicating that treatment with PVBVA solutions increased wood hardness locally, being enhanced with solution concentration. The best surface mechanical properties were obtained for the samples immersed in the 10%-PVBVA solution.

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Section: Resultssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Consolidation of Fir Wood by Poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) Treatment: Study of Surface and Mechanical Characteristics

2020

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“…In these cases, it is important to choose consolidating treatments on the basis of different degrees of penetration, morphological characteristics, and locations within the timber to be consolidated [13][14]. A recent study examined the consolidating properties of two commercial products (Paroloid B72 and Regalrez 1126) applied to wood, used to achieve a synergic effect according to their different levels of penetration [15].…”

Section: Research Aimsmentioning

confidence: 98%

Protective action against fungal growth of two consolidating products applied to wood

Clausi

Crisci

Russa

et al. 2011

Journal of Cultural Heritage

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“…In such cases, it is convenient to use a biocide to stop fungal activity and then consolidate the degraded elements so that the timber keeps on fulfilling its structural and decorative functions. In 1986, Nakhla recommended that a fungicide should be applied whenever the use of synthetic resins was required in wooden works of art [7], and application of biocides became a routine practice in the conservation of art works [8], even though studies about compatibility of different products are scarce.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Evaluation of Timber Conservation Processes by Bending Tests

Henriques

Nunes

Brito

2013

AMR

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This paper presents the laboratory work performed with the purpose of understanding the mechanical performance of 340x20x20 mm maritime pine wood samples degraded by rot fungi when treated with a biocide product followed by consolidation through impregnation with a polymeric product.Four commercially available products were used: a water-based biocide, BC, a solvent-based biocide, X, an acrylic consolidant, PB (PB 72), and an epoxy-based consolidant, E.Seven sets of specimens each one having a varied range of fungal degradation were prepared. Then the product combinations were applied by brush to six sets of specimens (E, X-E, BC-E, PB, X-PB, BC-PB) of which one was left untreated for control, 0-0. Finally all sets were subjected to static bending strength test until rupture.Results showed that the acrylic and epoxy-based products lead to increased mechanical capacity of the consolidated wood up to 100% in some cases in specimens with 70% of MOE loss. The results presented the same order of magnitude for both wood consolidants. The previous application of biocide did not have a significant impact in the behavioral pattern of the consolidant: a marked improvement of the bending strength of the degraded specimens after treatment and consolidation. These results demonstrated the feasibility of combining biocide/consolidation products, and provide indications of interest to the application of this technique to extend the lifespan of wood elements moderately degraded by fungi in old buildings.

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A comparative study of resins for the consolidation of wooden objects

Cited by 23 publications

References 2 publications

Consolidation of Fir Wood by Poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) Treatment: Study of Surface and Mechanical Characteristics

Consolidation of Fir Wood by Poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate) Treatment: Study of Surface and Mechanical Characteristics

Protective action against fungal growth of two consolidating products applied to wood

Mechanical Evaluation of Timber Conservation Processes by Bending Tests

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