Photodegradation of acrylic resins used in the conservation of stone

Melo, Maria João; Bracci, Susanna; Camaiti, Mara; Chiantore, Oscar; Piacenti, Franco

doi:10.1016/s0141-3910(99)00048-8

Cited by 158 publications

(107 citation statements)

References 13 publications

Supporting

Mentioning

104

Contrasting

Unclassified

Order By: Relevance

“…A wide range of synthetic polymers has been extensively used in stone conservation treatments, but their long lasting efficacy and performance in preventing further deterioration has been recently drastically reconsidered as they frequently undergo chemical modifications induced both by environmental conditions and irreversibility of the treatment [8][9][10]. Traditional inorganic treatments, though usually more compatible with the carbonate matrices, suffer from low solubility and therefore a resulting low amount of applied product as well as from a scarcely cohesive effect.…”

Section: Introductionmentioning

confidence: 99%

Innovative consolidating products for stone materials: field exposure tests as a valid approach for assessing durability

et al. 2015

View full text Add to dashboard Cite

The impact of climate on cultural heritage surfaces leads to several damage processes and the protection and the preservation of works of art is a challenge for conservation scientists and restorers. Traditional and innovative products are used in consolidating treatments in order to reduce the effects of the interaction environment-materials. The EC NANOMATCH Project aims at the development of innovative consolidating agents for carbonate matrices, wood and glass whose features should result in high compatibility, efficiency and long-lasting effect. In this project, metal alkoxides, molecular precursors for the deposition of metal carbonate are synthesized, characterized, tested and proposed as an alternative to traditional consolidating agents as well as to calcium hydroxide nanoparticles. This paper gives an overall description of the methodological approach adopted for the in field evaluation of durability taking into account the environmental impact. Preliminary results of the analyses carried out on carbonate stones aimed at investigating the features of the consolidating treatment are here presented and discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Innovative consolidating products for stone materials: field exposure tests as a valid approach for assessing durability

et al. 2015

View full text Add to dashboard Cite

show abstract

“…(Forster & Kayan, 2009;Balaras et al, 2005). Like any material, aging and decay are the major factors in stone deterioration (Melo et al, 1999). Compounding this previous incorrect and inappropriate repair interventions have caused significant problems for those entrusted with the conservative repair of stone built structures and have led to widescale latent building defects.…”

Section: Introductionmentioning

confidence: 99%

Surface consolidation of natural stone materials using microbial induced calcite precipitation

et al. 2014

View full text Add to dashboard Cite

Purpose – Deterioration in natural stone is associated with many decay mechanisms and often the inherent composition of the materials themselves. Sandstone varies considerably but they all require a cementing matrix to bind amongst others, the silica (SiO2) particles together (Reading, 1989). In calcareous sandstones and limestones this binding matrix is principally calcium carbonate based (Muir, 2006; Reading, 1989; McMillan et al., 1999) in the form of calcite (CaCO3). Friable sandstone substrates and stones suffering from “surface dissolution” or disaggregation (Muir, 2006; Smith et al., 1992) have been traditionally consolidated utilising a host of chemical compounds that had, in many cases negative effects on their long-term performance (Muir, 2006). A principle issue amongst many was moisture entrapment and irreversibility of the consolidants adopted. The paper aims to discuss these issues. Design/methodology/approach – This paper investigates the effect of microbial induced calcite precipitation (MICP) as a natural treatment for the conservation of historic natural stone substrates. Sporosarcina pasteurii has been proven as a bacterium that can perform MICP effectively in extreme conditions making it the preferred bacterium for the MICP process within this study. Surface treatment experiments were analysed by measuring the mass increase and surface changes using scanning electron microscopy (SEM). Findings – The surface treatments showed a noticeable mass increase and observable deposition when viewed using a SEM microscope. Bio cementation of loose sand particles was observed and the degree of cementation was determined using a Moh's hardness test. Research limitations/implications – Recommendations for further work to improve this study are: use an increased Sporosarcina pasteurii cell optical density which would provide a greater calcite output. Carry out a paired comparison initial surface absorption test (BS 1881: Part 208, 1996 or ASTM C 1585-04, 2004). To be carried out on untreated control and MICP samples which would determine the pore blocking effect and surface repair capability of the treated samples. Practical implications – A method for obtaining optimal results in terms of surface treatment would involve reducing the time between mixing and application, this would require having the two reaction constituents mixed only seconds before use. Using a late mix spray application system has the potential to allow the two mixtures to combine in the spray nozzle whilst exiting the apparatus. Originality/value – This paper investigates a safe, natural process for stone repair.

show abstract

“…The neat polymer, being subjected to depolymerization after photolytic scission of main chains, shows the largest photodegradation [43]. Indeed, the highest ∆E* value due to an increase in the L* coordinate up to the value of the Spectralon reference ( Figure S1 and Table S1 in Supplementary Materials) could be a consequence of polymer loss that lead gradually to several uncoated areas [53]. No yellowing effect was detected, as proved by the negligible C variation.…”

Section: Accelerated Agingmentioning

confidence: 86%

“…Those effects may be attributed to a γ-lactone [43,[53][54][55] and to terminal C=C double bonds, respectively, produced by chain scission increasing the terminal carbon-carbon unsaturations during aging [53,54]. Furthermore, minor changes in band intensities were observed, evidencing chemical changes in the copolymer upon UV irradiation.…”

Section: Accelerated Agingmentioning

confidence: 98%

Waterborne Acrylate-Based Hybrid Coatings with Enhanced Resistance Properties on Stone Surfaces

et al. 2018

View full text Add to dashboard Cite

Abstract:The application of coating polymers to building materials is a simple and cheap way to preserve and protect surfaces from weathering phenomena. Due to its environmentally friendly character, waterborne coating is the most popular type of coating, and improving its performance is an important key of research. The study presents the results regarding the mechanical and photo-oxidation resistance of some water-based acrylic coatings containing SiO 2 nanoparticles obtained by batch miniemulsion polymerization. Coating materials have been characterized in terms of hydrophobic/hydrophilic behavior, mechanical resistance and surface morphology by means of water-contact angle, and scrub resistance and atomic force microscopy (AFM) measurements depending on silica-nanoparticle content. Moreover, accelerated weathering tests were performed to estimate the photo-oxidation resistance of the coatings. The chemical and color changes were assessed by Fourier-transform infrared spectroscopy (FTIR) and colorimetric measurements. Furthermore, the nanofilled coatings were applied on two different calcareous lithotypes (Lecce stone and Carrara Marble). Its properties, such as capillary water absorption and color modification, before and after accelerated aging tests, were assessed. The properties acquired by the addition of silica nanoparticles in the acrylic matrix can ensure good protection against weathering of stone-based materials.

show abstract

Photodegradation of acrylic resins used in the conservation of stone

Cited by 158 publications

References 13 publications

Innovative consolidating products for stone materials: field exposure tests as a valid approach for assessing durability

Innovative consolidating products for stone materials: field exposure tests as a valid approach for assessing durability

Surface consolidation of natural stone materials using microbial induced calcite precipitation

Waterborne Acrylate-Based Hybrid Coatings with Enhanced Resistance Properties on Stone Surfaces

Contact Info

Product

Resources

About