Effect of the addition of hydroxyl-terminated polydimethylsiloxane to TEOS-based stone consolidants

Ramón Zárraga, Jorge Cervantes, Carmen Salazar-Hernandez, George Wheeler

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Hybrid stone consolidants prepared from tetraethoxysilane (TEOS) and α,ω-hydroxyl-terminated polydimethylsiloxane (PDMS-OH) have been considered as one of the most promising approaches to improve the effectiveness of traditional alkoxysilane-based formulations. They have emerged as response to the negative reports commonly found in the literature: the resulting silica gel phase (SiO2) tends to develop fractures and fissures inside the stone as the gel shrinks during the drying stage. In this work, we employed SEM, solid-state29Si NMR spectroscopy and compressive tests to characterize SiO2-PDMS hybrid gels. We report the morphological characteristics exhibited by gels prepared in vitro and in situ. It was found an appreciable reduction of gel fracture for hybrids prepared from 5% w/w of PDMS. As TEOS polycondenses, PDMS-OH is chemically incorporated into the gel matrix via Si-O-Si bonds. The inclusion of these elastic chains provides the necessary flexibility to resist the stress imposed by capillary pressure. Additionally, an important hydrophobic character is imparted to the stone. © 2009 Elsevier Masson SAS. All rights reserved.
Original languageAmerican English
Pages (from-to)138-144
Number of pages7
JournalJournal of Cultural Heritage
DOIs
StatePublished - 1 Jan 2010
Externally publishedYes

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Polydimethylsiloxane
Hydroxyl Radical
Gels
Polymers
Capillarity
Silica Gel
Silica gel
Nuclear magnetic resonance spectroscopy
Drying
baysilon
tetraethoxysilane
Consolidants
Scanning electron microscopy

Cite this

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title = "Effect of the addition of hydroxyl-terminated polydimethylsiloxane to TEOS-based stone consolidants",
abstract = "Hybrid stone consolidants prepared from tetraethoxysilane (TEOS) and α,ω-hydroxyl-terminated polydimethylsiloxane (PDMS-OH) have been considered as one of the most promising approaches to improve the effectiveness of traditional alkoxysilane-based formulations. They have emerged as response to the negative reports commonly found in the literature: the resulting silica gel phase (SiO2) tends to develop fractures and fissures inside the stone as the gel shrinks during the drying stage. In this work, we employed SEM, solid-state29Si NMR spectroscopy and compressive tests to characterize SiO2-PDMS hybrid gels. We report the morphological characteristics exhibited by gels prepared in vitro and in situ. It was found an appreciable reduction of gel fracture for hybrids prepared from 5{\%} w/w of PDMS. As TEOS polycondenses, PDMS-OH is chemically incorporated into the gel matrix via Si-O-Si bonds. The inclusion of these elastic chains provides the necessary flexibility to resist the stress imposed by capillary pressure. Additionally, an important hydrophobic character is imparted to the stone. {\circledC} 2009 Elsevier Masson SAS. All rights reserved.",
author = "Ram{\'o}n Z{\'a}rraga and Jorge Cervantes and Carmen Salazar-Hernandez and George Wheeler",
year = "2010",
month = "1",
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doi = "10.1016/j.culher.2009.07.002",
language = "American English",
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Effect of the addition of hydroxyl-terminated polydimethylsiloxane to TEOS-based stone consolidants. / Zárraga, Ramón; Cervantes, Jorge; Salazar-Hernandez, Carmen; Wheeler, George.

In: Journal of Cultural Heritage, 01.01.2010, p. 138-144.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of the addition of hydroxyl-terminated polydimethylsiloxane to TEOS-based stone consolidants

AU - Zárraga, Ramón

AU - Cervantes, Jorge

AU - Salazar-Hernandez, Carmen

AU - Wheeler, George

PY - 2010/1/1

Y1 - 2010/1/1

N2 - Hybrid stone consolidants prepared from tetraethoxysilane (TEOS) and α,ω-hydroxyl-terminated polydimethylsiloxane (PDMS-OH) have been considered as one of the most promising approaches to improve the effectiveness of traditional alkoxysilane-based formulations. They have emerged as response to the negative reports commonly found in the literature: the resulting silica gel phase (SiO2) tends to develop fractures and fissures inside the stone as the gel shrinks during the drying stage. In this work, we employed SEM, solid-state29Si NMR spectroscopy and compressive tests to characterize SiO2-PDMS hybrid gels. We report the morphological characteristics exhibited by gels prepared in vitro and in situ. It was found an appreciable reduction of gel fracture for hybrids prepared from 5% w/w of PDMS. As TEOS polycondenses, PDMS-OH is chemically incorporated into the gel matrix via Si-O-Si bonds. The inclusion of these elastic chains provides the necessary flexibility to resist the stress imposed by capillary pressure. Additionally, an important hydrophobic character is imparted to the stone. © 2009 Elsevier Masson SAS. All rights reserved.

AB - Hybrid stone consolidants prepared from tetraethoxysilane (TEOS) and α,ω-hydroxyl-terminated polydimethylsiloxane (PDMS-OH) have been considered as one of the most promising approaches to improve the effectiveness of traditional alkoxysilane-based formulations. They have emerged as response to the negative reports commonly found in the literature: the resulting silica gel phase (SiO2) tends to develop fractures and fissures inside the stone as the gel shrinks during the drying stage. In this work, we employed SEM, solid-state29Si NMR spectroscopy and compressive tests to characterize SiO2-PDMS hybrid gels. We report the morphological characteristics exhibited by gels prepared in vitro and in situ. It was found an appreciable reduction of gel fracture for hybrids prepared from 5% w/w of PDMS. As TEOS polycondenses, PDMS-OH is chemically incorporated into the gel matrix via Si-O-Si bonds. The inclusion of these elastic chains provides the necessary flexibility to resist the stress imposed by capillary pressure. Additionally, an important hydrophobic character is imparted to the stone. © 2009 Elsevier Masson SAS. All rights reserved.

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DO - 10.1016/j.culher.2009.07.002

M3 - Article

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EP - 144

JO - Journal of Cultural Heritage

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