The interfacial interaction between isocyanate and stainless steel

Tardio, Sabrina; Abel, Marie‐Laure; Carr, R. H.; Watts, John F.

doi:10.1016/j.ijadhadh.2018.10.008

Cited by 38 publications

(44 citation statements)

References 14 publications

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“…The rise in the concentration of the N δ+ component in Ta‐02 originates from acid–base interactions between the nitrogen in pMDI and the tantalum of the substrate. Similar interactions have been proposed previously between pMDI and 316L stainless steel 9 . This interaction is between the nitrogen atom of one of the isocyanate reaction products described in Figure 1 and a tantalum atom in the substrate.…”

Section: Resultssupporting

confidence: 80%

“…Ta‐03 and Ta‐04 N1s spectra show surfaces typical of pMDI, mainly composed of the isocyanate component at 400.1 eV and were in keeping with previous studies of pMDI 3,9 . FWHM were restrained to 1.5 eV for all components.…”

Section: Resultssupporting

confidence: 76%

“…The negative spectrum shows several tantalum oxide fragments of varying oxidation state across the whole mass spectrum and all possess deviations assessed by the Δ parameter of less than 60 ppm, confirming the fidelity of all their assignments. The D parameter (in units of % ppm) is the standard method to assess the fidelity of mass assignment in mass spectrometry and is defined by Tardio et al 9 Their presence will be used to confirm the interfacial region that is being sampled in the ToF‐SIMS analysis of the interface samples as well as aiding in identifying fragments specific to the interface or the substrate.…”

Section: Resultsmentioning

confidence: 99%

“…C1s assignments and BE were in keeping with previous studies of pMDI (Figure 5). 3,9 FWHM were restricted to 1.4 eV for all carbon components bar the CC/H at 1.3 eV and the shake‐up structures, which were 2.1 and 2.8 eV for Ta‐03 and Ta‐04, respectively. O1s assignments were made to be in keeping with the identified C1s components and their FWHM restrained to 1.6 eV (Figure 6).…”

Section: Resultsmentioning

confidence: 99%

“…Multiple studies have identified similar bonding structures on steel surfaces with fourier‐transform infrared spectroscopy, 7 X‐ray photoelectron spectroscopy (XPS) and ToF‐SIMS 8–10 . A carbamate bond with steel surfaces was first identified by Chehimi and Watts.…”

Section: Introductionmentioning

confidence: 99%

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An interfacial chemistry study of methylene diphenyl diisocyanate and tantalum for heat exchanger applications

Bevas

Abel

Jacobs³

et al. 2020

Surface & Interface Analysis

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The interactions between oxidised tantalum and methylene diphenyl diisocyanate (MDI) have been investigated by X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (ToF-SIMS). Thin (approximately 2 nm) and thick layers of polymeric MDI were deposited on tantalum; one set was cured at 200 C, the other dried at ambient temperature (20 C). The thick layers serve as a characteristic pMDI layer, and thin layers contain information relating to the nature of interfacial bonding. By careful fitting of the N1s region contributions relating to interfacial bonding have been established. All spectra show an N δ+ contribution indicative of acid-base bonding; in the case of the thick films, this is of an intermolecular nature whereas in the thin films, the more intense contribution is a result of such forces between pMDI and substrate. This is confirmed by ToF-SIMS. A lower binding energy component at ca 396 eV on the air-dried thin layer of pMDI is the result of a formal reaction between pMDI and tantalum yielding a nitride-like species in the N1s spectrum.

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Section: Resultssupporting

confidence: 80%

Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An interfacial chemistry study of methylene diphenyl diisocyanate and tantalum for heat exchanger applications

Bevas

Abel

Jacobs³

et al. 2020

Surface & Interface Analysis

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Industrial scale fouling of heat exchangers in isocyanate production

Bevas,

Abel,

Jacobs

et al. 2024

Surface & Interface Analysis

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The fouling of a commercial stainless steel (AISI 316L) during the manufacture of polymeric methylene diphenyl diisocyanate (pMDI) has been studied using laboratory‐based fouling apparatus that simulates commercial production conditions. The goal of the work is to understand the mechanisms behind the corrosion and fouling during isocyanate production with a view to improving process efficiency, not only in this process, but also others using similar plant and processes. Steel coupons were exposed to a solution of pMDI and solid amine hydrochloride, with hydrogen chloride gas being bubbled through the reaction cell. A number of different conditions were investigated, the variables being pMDI concentration, HCl gas flow duration, immersion time and temperature. Following the fouling experiments the coupons were removed from the fouling rig, photographed, and examined by XPS and ToF‐SIMS; principal component analysis was used to extend the ToF‐SIMS analysis to identify organic fouling products. The extent of fouling is shown to be relatively insensitive to pMDI concentration, but significantly influenced by continual HCl flow and increased temperature, features which increase the extent of substrate corrosion thought to be a precursor to the fouling process itself. Both XPS and ToF‐SIMS confirm the formation of various nickel chlorides in the corrosion process. Urea and metal corrosion products are found to co‐exist on certain (random) areas of the coupon surface.

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Supramolecular/Dynamic Covalent Design of High‐Performance Pressure‐Sensitive Adhesive from Natural Low‐Molecular‐Weight Compounds

Luo,

Wang,

Pan

et al. 2024

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Adhesive materials have played an essential role in the history of humanity. Natural adhesives composed of low‐molecular‐weight monomers have been overshadowed by modern petroleum‐based glues. With the development of green economy, the demand for eco‐friendly materials has increased. Herein, two natural biocompatible compounds, namely thioctic acid (TA) and malic acid (MA), are selected to prepare a high‐performance pressure‐sensitive adhesive poly[TA‐MA]. This adhesive can be quantitatively obtained via a simple mixing and heating process. Poly[TA‐MA] shows interesting and useful properties, including reversible flexibility, high elongation, and good self‐healing, owing to its dynamic polymerization pattern and reversible cross‐linking behavior. Poly[TA‐MA] exhibits excellent adhesion performance under various extreme conditions, such as at low temperatures and in hot water. High values of shear strength (3.86 MPa), peel strength (7.90 N cm−1), loop tack (10.60 N cm−1), tensile strength (1.02 MPa), and shear resistance (1628 h) demonstrate the strong adhesive effect of poly[TA‐MA]. Additionally, TA can be regenerated in the monomer forms from poly[TA‐MA] with high recovery rate (>90%). Meanwhile, strong anti‐bacterial behavior of poly[TA‐MA] is recorded. This study not only reported a new pressure‐sensitive adhesive but also fully displayed the feasibility of using natural small molecules to achieve robust surface adhesion.

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The interfacial interaction between isocyanate and stainless steel

Cited by 38 publications

References 14 publications

An interfacial chemistry study of methylene diphenyl diisocyanate and tantalum for heat exchanger applications

An interfacial chemistry study of methylene diphenyl diisocyanate and tantalum for heat exchanger applications

Industrial scale fouling of heat exchangers in isocyanate production

Supramolecular/Dynamic Covalent Design of High‐Performance Pressure‐Sensitive Adhesive from Natural Low‐Molecular‐Weight Compounds

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