Polyurethane coatings used in twentieth century outdoor painted sculptures. Part I: comparative study of various systems by means of ATR-FTIR spectroscopy

Defeyt, Catherine; Langenbacher, Julia; Rivenc, Rachel

doi:10.1186/s40494-017-0124-7

Cited by 39 publications

(28 citation statements)

References 16 publications

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“…The characteristic peaks appeared at 2850 and 2920 cm −1 correspond to the stretching band of CH 3 and CH 2 , respectively . The absorbance band at 1680 cm −1 can be assigned to the amide groups of the untreated PU film, while the peak appeared at 1745 cm −1 can be attributed to the ester groups in the castor oil structure . In the ATR‐FTIR spectrum of the grafted PU film with acrylic acid, with the wide peak ranging from 3750 to 2500 cm −1 , confirms the presence of acrylic acid on the PU film .…”

Section: Resultsmentioning

confidence: 71%

Low‐pressure plasma surface modification of polyurethane films with chitosan and collagen biomolecules

Bahrami

Khorasani

Mahdavi

et al. 2019

J of Applied Polymer Sci

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Polyurethane (PU) was synthesized using castor oil and a trade grade of hexamethylene diisocyanate, and then PU films were prepared for wound dressing applications. The PU films were then plasma treated with the low-pressure nitrogen plasma to functionalize with peroxide and hydroperoxide groups in order to attach with acrylic acid monomers. Therefore, the polyacrylic acid polymer branches were formed on the film surfaces. Carboxylic acid groups were activated by N-(3-dimethylaminopropyl)-N 0 -ethyl carbodiimide hydrochloride/N-hydroxysuccinimide and bonded with chitosan and collagen biomolecules. Untreated, nitrogen plasma treated, polyacrylic acid grafted, and finally chitosan and collagen-immobilized PU films were characterized by several tests. The tests included the attenuated total reflectance Fourier transform infrared spectroscopy, static contact angle, atomic force microscopy, scanning electron microscopy, fibroblast L929 cell culture, and antibacterial activity assay to evaluate their in vitro cytocompatibility. The results confirmed that chitosan and collagen were immobilized successfully on the PU surfaces. The chitosan-immobilized PU and collagen-immobilized PU improved the adhesion and proliferation of fibroblast cells compared to untreated PU films. The chitosanmodified PU films exhibit the best antibacterial properties.

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Section: Resultsmentioning

confidence: 71%

Low‐pressure plasma surface modification of polyurethane films with chitosan and collagen biomolecules

Bahrami

Khorasani

Mahdavi

et al. 2019

J of Applied Polymer Sci

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“…Furthermore, majority of isocyanate groups of HMDI seem to be involved in the reaction with cellulose. This conclusion follows from the disappearance of vibrational mode at 2270 cm −1 which is associated with the stretching vibration of the functional group NCO in the initial monomer …”

Section: Resultsmentioning

confidence: 88%

Dimensionally Stable Cellulose Aerogel Strengthened by Polyurethane Synthesized In Situ

Verdolotti

Stanzione

Khlebnikov

et al. 2018

Macro Chemistry & Physics

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Fibrillary cellulose and nanocellulose are widely applied as fillers for the improvement of the mechanical properties, thermostability, and biodegradability of polymers. Here, an opposite concept is suggested which is to use cellulose for structure‐forming and directing the scaffold, whereas polymers serve for its modification. Cellulose possesses excellent properties, but they are badly affected by water; its mechanical strength drops sharply, cellulosic materials swell, become dimensionally unstable, and susceptible to fungal degradation. The deterioration of properties gives no way of using methods of wet chemistry for cellulose treatment. To obviate this problem, dimensionally stable aerogels are prepared from microfibrillated cellulose. Their stability allows them to be treated in solutions of isocyanate. Polyurethane synthesized in situ is attached covalently to cellulose through hydroxyl groups. Polymer coating further stabilizes the 3D microfibrillar network, Young's modulus increases by more than two orders of magnitude and differences in the properties of aerogels in the dried and wetted states are minimized. Improvement of the mechanical strength makes cellulose aerogels better suitable for various applications than present cellulosic materials.

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“…The presence of the urethane group can be assessed by several peaks, such as the one at 1541 cm −1 due to the coupling of N H bending vibration with C N stretching vibration in the C NH group (amide II band), which can be seen in Fig. 1 sample 3 [35,38,39]. Extenders, or fillers, are inorganic minerals whose refractive index approximately is equal to that of the binder.…”

Section: Characterization Of the Spray-can Paintsmentioning

confidence: 99%

Nanostructured fluids for the removal of graffiti – A survey on 17 commercial spray-can paints

Baglioni

Poggi

Benavides

et al. 2018

Journal of Cultural Heritage

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Graffiti removal from monuments, such as statues or architecture, is becoming a priority for conservators and restorers. This operation is further complicated when the vandalism is carried out on surfaces that should be preserved, as in the case of writings or tags on historical wall paintings, or even on modern or contemporary pieces of street art. Several methods exist for graffiti removal, which include chemical, physical or biological approaches. However, traditional methodologies, such as the use of neat organic solvents, are often unsuitable. Moreover, due to the great variability of brands and formulation of commercial paints, a thorough study of materials used for graffiti and a deep knowledge of their behavior when exposed to cleaning media is currently lacking. In this contribution, we report a systematic laboratory survey on 17 different spray-can paints available on the market and commonly used for graffiti and vandalism in the Mexican area. These paints were analyzed by means of ATR FT-IR spectroscopy to characterize their composition. Several solvents, having different nature and polarity, were then used to remove the paints from glass slides. On the basis of these results, two different amphiphile-based nanostructured fluids, which present several advantages with respect to traditional cleaning methodologies, were formulated and tested on the same paint samples. Finally, the two nanostructured cleaning systems were used for the removal of vandalistic graffiti from stones decorated with red pre-Hispanic paintings in the archeological site of Ba' Cuana, Asunciòn Ixtalpetec, Oaxaca, Mexico.

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Polyurethane coatings used in twentieth century outdoor painted sculptures. Part I: comparative study of various systems by means of ATR-FTIR spectroscopy

Cited by 39 publications

References 16 publications

Low‐pressure plasma surface modification of polyurethane films with chitosan and collagen biomolecules

Low‐pressure plasma surface modification of polyurethane films with chitosan and collagen biomolecules

Dimensionally Stable Cellulose Aerogel Strengthened by Polyurethane Synthesized In Situ

Nanostructured fluids for the removal of graffiti – A survey on 17 commercial spray-can paints

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