Fluorinated Polyurethanes: XPS and AFM Characterization

Penoff, Marcela Elisabeth; Schreiner, W. H.; Oyanguren, Patricia Angelica; Montemartini, Pablo E.

doi:10.1002/masy.201251133

Cited by 8 publications

(10 citation statements)

References 11 publications

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“…We use X‐ray photoelectron spectrometer (XPS) spectrum to confirm the chemical composition and explain the lubrication mechanism of gel lubricant . As shown in Figure , the XPS peak of Fe 2p appears at 710.9 and 724.3 eV and the O1s peak appears at 529.9 eV, which may ascribe to Fe 2 O 3 , FeOOH, etc.…”

Section: Resultsmentioning

confidence: 99%

Physicochemical and Tribological Performance of Bi‐Component Supramolecular Gel Lubricants

Zhang

Bai

et al. 2018

Adv Materials Inter

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problems in the process of their application. For example, the lubricating oils have leakage, climbing, and volatilization loss in the process of mechanical operation, which not only produce pollution and waste, but also cause lubrication failure. The use of grease can partially solve the leakage and climbing of lubricating oil, but itself also has some problems, such as poor lubrication performance due to introduction of thickener, poor cooling effect, and the high viscosity leading to the limited running speed of the mechanical bearing. It is exciting that the recently developed supramolecular gel lubricants are expected to solve these problems of lubricants and greases. [2] The gel lubricant looks like a semisolid grease, but it presents the characteristics of the lubricating oil due to the shear force and temperature rise making them turn into liquid in the sliding process. These characteristics can maintain good lubrication without affecting the speed of the mechanical and heat dissipation. At present, there are few reports on gel lubricants in the world. Mori and co-workers reported a thermally reversible gel lubricant, and found that the lubricating ability of the gel lubricant was related to the structure and concentration of the gelator. The tribological results show that the gel has a good lubrication performance mainly because the lubricant is easy to form an effective protective film on the contact surface. [3][4][5] Our group has designed and prepared a class of low molecular weight gelators that can gelate a variety of lubricating oils. [6][7][8][9] The experimental results show that the prepared new type of gel lubricant can effectively avoid the creep of lubricating oils and have better antifriction and antiwear properties than that of the lubricating oil and grease. [10] However, the above reported gel lubricants also have some defects, such as the complicated synthesis steps of the gelator, and the high cost of the raw materials. Therefore, designing and preparing highperformance, low-cost, and easy prepared gel lubricants is still one of the research hotspots in this field.In addition to the individual component geltors, a variety of two components can also form a complex by intermolecular noncovalent interaction, [11][12][13][14] and then gelate solvent to form a gel. For this complex, a single component in the solvent Here, reported is a new, simple, and nonsynthetic way of in situ preparation of bi-component supramolecular gel lubricants, which are formed by supramolecular self-assembly of bis(2-ethylhexyl) sulfosuccinate (AOT) and aromatic acid derivatives via the noncovalent interaction in the base lubricating oil. The formation mechanism of the gel lubricant was investigated by experimental and theoretical calculations. The results of 1 H nuclear magnetic resonance, ultraviolet, and molecular dynamics simulations show that they formed a network structure through intermolecular hydrogen bonding and π-π stacking, thereby solidifying the base oil to form gel. The rheological and thermal anal...

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Section: Resultsmentioning

confidence: 99%

Physicochemical and Tribological Performance of Bi‐Component Supramolecular Gel Lubricants

Zhang

Bai

et al. 2018

Adv Materials Inter

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“…Reaction of a perfluorinated epoxy (2,2,3,3,4,4,5,5,6,6,7,7,8,9,9,9-hexadecafluoro-8-trifluoromethyl nonyloxirane, FED3, Sigma-Aldrich) with a known excess of a di-amine (propyleneoxidediamine, Jeff, Huntsman). The reaction was performed in sealed tubes immersed in an oil bath, whose temperature was kept at 1008C for 120 min.…”

Section: Methodsmentioning

confidence: 99%

“…1,2,5,7,8 Among these polymers, epoxy resin based materials exhibit outstanding properties which make them a standard option for many applications such as adhesives, coatings, and structural composites. One of their most attractive features is the flexibility in the election of their monomers and co-monomers, which in turn leads to a wide variety of products, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the low surface free energy of a component provides a thermodynamic driving force for migration to interfaces. [1][2][3][4][5][6][7] Due to this natural migration it is possible to design materials with controlled surface properties by employing a low content of the expensive modifier and, at the same time, by discarding processing problems related to high fluorine concentrations.…”

Section: Introductionmentioning

confidence: 99%

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Fluorinated networks dynamics studied by means of broadband dielectric spectroscopy

Miccio

Otegui

Penoff

et al. 2015

J of Applied Polymer Sci

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The influence of the surface chemical modification on the bulk behavior of epoxy based networks has been studied. In particular, the bulk dynamics of epoxy-amine networks modified with fluorinated side chains has been characterized by means of broadband dielectric spectroscopy (BDS), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy. The fluorination effect on the structure and dynamics of the materials has been related with the observed changes in both segmental and secondary relaxations. An acceleration of the segmental dynamics as the fluorination degree increases has been clearly observed. As a result, a compromise between fluorine surface enrichment and bulk modification has been proposed for these materials.

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“…[13][14][15][16][17] In the existing research, most of commercially available fluorinated polymers usually present a high fluorine content as high as 50-70 wt % which represents an obstacle for their application, such as difficulties for process ability and high costs. 18 In addition to the introduction of fluorine into PU chain, many researchers also tried to modify neat PU with nanofillers, such as Pal, montmorillonoid, carbon nanotube, et al With the aim of overcoming these application restricts of FPU, the only way is to keep fluorine's content at a relative suitable value. And the most commonly and easy way is to add certain nanoparticles to modify FPU to compensate for the lack of fluorite element.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and thermal properties of organically modified palygorskite/fluorinated polyurethane nanocomposites

Zhu

Wang

2017

J of Applied Polymer Sci

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In this article, fluorinated polyurethane (FPU) nanocomposites filled with organic modified palygorskite (Pal) were synthesized and characterized by Fourier transform infrared, X‐ray diffraction, thermogravimetric analysis (TGA), and scanning electron microscope individually. The Pal nanorods were modified with 4,4′‐methylene (MDI) by chemical bond. TGA results showed that there are almost 27 wt % of 4,4′‐methylene grafting or absorbing on Pal nanorods’ surface. Compared with neat FPU, FPU nanocomposites exhibited somewhat increase in the soft segment glass transition temperature and decrease in the hard segment glass transition temperature. It means the compatibility between soft segment and hard segment becomes better than neat FPU. TGA results also showed that the thermal stability of FPU nanocomposites improved with increasing modified Pal loadings. Pal showed good compatibility with the FPU matrix through scanning electron microscope test results. And, the introduction of Pal into FPU matrix will not affect migration of fluoride side chain. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45460.

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Fluorinated Polyurethanes: XPS and AFM Characterization

Cited by 8 publications

References 11 publications

Physicochemical and Tribological Performance of Bi‐Component Supramolecular Gel Lubricants

Physicochemical and Tribological Performance of Bi‐Component Supramolecular Gel Lubricants

Fluorinated networks dynamics studied by means of broadband dielectric spectroscopy

Synthesis and thermal properties of organically modified palygorskite/fluorinated polyurethane nanocomposites

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