Durability of Polymer Metal Multilayer: Focus on the Adhesive Chemical Degradation

Dubelley, Florence; Bas, Corine; Planès, Émilie; Pons, Emmanuelle; Yrieix, Bernard; Flandin, Lionel

doi:10.3389/fchem.2018.00459

Cited by 5 publications

(2 citation statements)

References 33 publications

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“…The absorbance bands are comparable to those reported for the mask samples, which determine its composition as a PUR ether-based adhesive. Further bands are at 3294 cm −1 (stretching vibration of N-H), 1534 cm −1 (amide II band) and at 1224 cm −1 (amide III) [19,37,63]. Moreover, the main absorption bands for phthalate were also identified at the glue's surface.…”

Section: Atr-ftirmentioning

confidence: 93%

Plastics in robots: a degradation study of a humanoid skin mask made of soft urethane elastomer

et al. 2022

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Understanding the degradation of plastic materials is a big challenge for curators, conservators and conservation scientists in museums worldwide aiming to preserve their collections due to the variety of formulations of synthetic polymers and pigments. The conservation of polyurethane (PUR) based objects is challenging because they can suffer from extensive degradation. Particularly PUR elastomers can degrade shortly after their production, as occurred to the mask of the Japanese robot SAYA, which within 8 years suffered from two large tears, discoloration and stickiness. This research aims at studying the degradation phenomena of the androids’ synthetic skin. Better knowledge of the chemical composition of the mask and the chemical and physical decay will contribute to planning a suitable stabilization treatment. Within a multi-analytical approach, colorimetric and microscopic investigations highlighted discolored areas, which showed further color changes within a five months monitoring campaign, confirming the instability of the material likely due to ongoing degradation. Raman microscopy allowed the identification of Pigment White 6 (titanium dioxide TiO2) in the anatase form, known to promote the photosensitivity of PUR substrates towards ultraviolet (UV) light. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy identified the PUR composition of the mask, the presence of phthalates as plasticizers and suggested the formation of quinone chromophores in the polymer structure as a result of photo-oxidation, possibly responsible for the mask yellowing. Evolved gas analysis-mass spectrometry (EGA-MS) and double-shot-gas chromatography/mass spectrometry (TD/Py–GC/MS) analyses support the characterization of the formulation of the mask as being made of methylene diphenyl diisocyanate (MDI) PUR ether elastomer. Plasticizers in high concentration, mainly diisononyl phthalate (DINP) and bis(2-ethylhexyl)phthalate (DEHP), and the UV stabilizer Tinuvin 328 were also detected. In addition, the presence of styrene-acrylonitrile (SAN) could also contribute to the mask’s chemical instability. More amount of UV stabilizer and phthalates were detected at the surface (contributing to its stickiness) than in the inner core. The degradation of the mask results from the light susceptibility of MDI PUR ether and SAN, as well as the higher photochemical activity of anatase. The mask was transferred on to a mannequin and placed in the storage area to prevent light exposure and photo-oxidation. As loose edges had to be stabilized, tests were conducted and adhesive stripes glued with a PUR dispersion were selected for keeping the head’s shape. The novelty of this study is the implementation of conservation science on the study of androids with PUR elastomeric components in robotic collections, which are becoming increasingly popular in technical museums, however still seldomly studied.

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Section: Atr-ftirmentioning

confidence: 93%

Plastics in robots: a degradation study of a humanoid skin mask made of soft urethane elastomer

et al. 2022

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“…The accelerated ageing cycles were chosen based on the likelihood that PURs would be subjected to hygrothermal stress under in-service conditions. It is known that under conditions of elevated temperature and moisture, the constituent polyol and urethane chemical entities may be hydrolysed (Dubelley et al, 2018). The susceptibility to and extent of degradation of individual PURs is highly dependant on composition.…”

Section: Introductionmentioning

confidence: 99%

Durability Studies of Polyurethane-Based Structural Adhesives Used in Engineered Wood Products in New Zealand

Nicholson¹

2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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The New Zealand Building Code is unique in the world in requiring evidence of a minimum durability of 50 years for all structural building elements. This prescriptive durability requirement equally applies to the adhesives used in structural applications such as engineered wood products (EWPs), including glulam, CLT and LVL. Conventional resorcinol-based structural adhesives have a long history of use in New Zealand, providing evidence of their ability to meet stringent durability requirements. Structural adhesives based on polyurethanes (PURs) are used extensively in other parts of the world and are rapidly gaining increasing interest in New Zealand due to their perceived environmental and production advantages. However, without a sufficiently long history of use, and a lack of data around their performance in the preservative treated pine EWPs typically manufactured in New Zealand, it is difficult to provide evidence of long-term durability for PURs in our domestic building industry. In this work, attenuated total reflectance Fourier transform infrared (ATR FTIR) spectroscopy in conjunction with multi-component analysis (chemometrics) was used to understand the changes that accelerated ageing cause in the chemistry of five PUR-based adhesives. The effect of hygrothermal stress was investigated through exposure of samples to accelerated ageing cycles of varying temperatures and humidities for up to 3 years' duration. Different samples were affected to different extents by each cycle. Spectroscopic data were also used to build predictive models which have the potential to be used in long-term durability assessment. Spectroscopic investigation in conjunction with mechanical testing offers the opportunity to provide a robust, fit-for-purpose test methodology for assessing the long-term durability of PUR-based structural adhesives.

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A Review of Waterborne Polyurethane Coatings and Adhesives with Polyester Polyol from Poly(Ethylene Terephthalate) Waste

2023

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Durability of Polymer Metal Multilayer: Focus on the Adhesive Chemical Degradation

Cited by 5 publications

References 33 publications

Plastics in robots: a degradation study of a humanoid skin mask made of soft urethane elastomer

Plastics in robots: a degradation study of a humanoid skin mask made of soft urethane elastomer

Durability Studies of Polyurethane-Based Structural Adhesives Used in Engineered Wood Products in New Zealand

A Review of Waterborne Polyurethane Coatings and Adhesives with Polyester Polyol from Poly(Ethylene Terephthalate) Waste

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