Discoloration of poly(vinyl acetate) (PVAc) gluelines in wood assemblies

Chiozza, Fabio; Santoni, Ilaria; Pizzo, Benedetto

doi:10.1016/j.polymdegradstab.2018.10.003

Cited by 10 publications

(4 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason of such behavior was connected to the PVA phase present inside the polymer, and a role was also assigned to AlCl 3 , used as complexing agent of the polymeric protective colloid [30]. It is commonly believed that the addition of AlCl 3 has a dual effect: 1) it increases acidity, and thus promoting the crosslinking reaction with the specific comonomer usually added to the dispersion and 2) it interacts with the electron-donating groups of the polymer, such as the PVA chains and the PVAc chains containing grafted PVA, with the formation of structures like chelates [31] [32]. Isocyanate hardener in PVAc adhesive was used to enhance the performance of RF press wooden assembly.…”

Section: Rf Curing Of Pvac Adhesivementioning

confidence: 99%

Radio Frequency Gluing Technique for Wood-to-Wood Bonding: Review

Gadhave¹

2023

OJPChem

View full text Add to dashboard Cite

White glues, also referred to as polyvinyl acetate (PVAc) adhesives, are thermoplastics that soften when heated to a specific degree and re-harden when cooled. For general assembly tasks in the joinery business, such as edge gluing, wood veneer, and edge bonding, white glues have been used. White glue requires a prolonged setting time to achieve adequate handling strength as it solidifies through evaporation or absorption of water by the wood. Cold press and hot press techniques are used to bond wood substrates. Recently, white glue is frequently used as a wood adhesive with dielectric heating systems to prevent this and enhance production speeds. Radio frequency (RF) curing is merely a technique for heating glue lines in wood-to-wood joints. It considered a source of heat, like steam and electricity. In order to bond wood substrates with the least amount of clamping time, the RF produces a very rapid, uniform rise in temperature. In this review paper, we discussed the radio frequency curing technique, their mechanism and troubleshooting to achieve perfect wood bond in joinery segment.

show abstract

Section: Rf Curing Of Pvac Adhesivementioning

confidence: 99%

Radio Frequency Gluing Technique for Wood-to-Wood Bonding: Review

Gadhave¹

2023

OJPChem

View full text Add to dashboard Cite

show abstract

“…On the other hand, information on the long-term stability of the so-called white glues, based on PVAC emulsions, is rather limited [14,15], especially when used either during the restoration practice or directly during the process of creation of artworks. As a fact, the purpose of this work is to study the accelerated degradation of a commercial PVAC-based white glue used in contemporary artworks, intending to predict its durability and, more in general, give hints on their behavior in pieces of art in which this material may constitute the critical, more degradable, component.…”

Section: Introductionmentioning

confidence: 99%

Ageing of a Poly(vinyl Acetate)-Based White Glue and Its Durability in Contemporary Artworks

Lazzari,

López Morán

2024

Preprint

View full text Add to dashboard Cite

Poly(vinyl acetate) (PVAC) is a ubiquitous polymer in various industrial applications, including paints and adhesives. While extensive research has focused on understanding the degradation mechanisms of PVAC-based paint, under different environmental conditions, limited attention has been paid to the long-term stability of PVAC-based white glues, especially when used in artworks. This study investigates the accelerated degradation of a commercial PVAC-based white glue considered as representive of this class of materials as used in contemporary artworks, to predict its durability and assess its behavior in art objects. Through accelerated aging experiments and comparison with natural aging observed in artworks, the study reveals the formation of chromophores and the release of plasticizer as key degradation processes. Despite minimal structural modifications in PVAC, the loss of plasticizer leads to an increase in glass transition temperature, affecting the adhesive's cohesive strength and contributing to detachment of materials in artworks. The findings underscore the importance of preventive conservation measures to mitigate degradation issues in PVAC-based artworks.

show abstract

“…On the other hand, information on the long-term stability of the so-called white glues, based on PVAC emulsions, is rather limited [ 17 , 18 , 19 ], especially when used either during the restoration practice or directly during the process of the creation of artworks. PVAC adhesives exposed up to 5 years to light aging with 40 W fluorescent lamps showed a higher degree and faster yellowing than acrylic adhesives used as a comparison, and also a higher surface acidity due to acetic acid release.…”

Section: Introductionmentioning

confidence: 99%

Aging of a Poly(vinyl acetate)-Based White Glue and Its Durability in Contemporary Artworks

Lazzari,

López-Morán

2024

Polymers

View full text Add to dashboard Cite

While extensive research has focused on understanding the degradation mechanisms of Poly(vinyl acetate) (PVAC) paint under different environmental conditions, limited attention has been paid to the long-term stability of PVAC-based white glues, especially when used in artworks. This study investigates the accelerated degradation, under simulated photoaging, and isothermal treatment of a commercial PVAC-based white glue considered representative of this class of materials used in contemporary artworks to predict its durability and assess its behavior in art objects. Through accelerated aging experiments and comparison with natural aging observed in artworks, the study reveals the formation of chromophores and the release of plasticizers as key processes; in particular, the progressive darkening was considered an early indicator of degradation processes, before structural changes could be detected by FTIR or NMR spectroscopies. The plasticizer loss induces an increase in glass transition temperature, from 7 °C to temperatures higher than room temperature, affecting the adhesive’s cohesive strength and contributing to the detachment of materials in artworks. The findings underscore the importance of preventive conservation measures to mitigate degradation issues in PVAC-based artworks.

show abstract

Discoloration of poly(vinyl acetate) (PVAc) gluelines in wood assemblies

Cited by 10 publications

References 25 publications

Radio Frequency Gluing Technique for Wood-to-Wood Bonding: Review

Radio Frequency Gluing Technique for Wood-to-Wood Bonding: Review

Ageing of a Poly(vinyl Acetate)-Based White Glue and Its Durability in Contemporary Artworks

Aging of a Poly(vinyl acetate)-Based White Glue and Its Durability in Contemporary Artworks

Contact Info

Product

Resources

About