Preparation of PMMA/hBN composite coatings for metal surface protection

Coan, T. E.; Barroso, Gilvan; Motz, Günter; Bolzan, Ariovaldo; Machado, Ricardo Antônio Francisco

doi:10.1590/s1516-14392013005000140

Cited by 40 publications

(19 citation statements)

References 26 publications

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“…[ 42 ] As outlined in Section 1, one difference between more recent buildings and antique constructions (Figure 1) is that the more recent cements have a lower content of Ca‐carbonate/phosphate. In the present study, we applied PMMA, a proven coating material, [ 43 ] as a vehicle and introduced it together with a combination of amorphous Ca‐polyP nanoparticles, “Ca‐polyP‐NP”, and polyP‐stabilized amorphous Ca‐carbonate, “ACC‐NP”, as essential components for the coating of cement, providing this binder with self‐healing properties. A scheme, summarizing the function of the polyP‐stabilized ACC nanoparticles, “ACC‐NP”, present in “PMMA‐Ca‐polyP/ACC‐NP” formulation is sketched in Figure 12 .…”

Section: Discussionmentioning

confidence: 99%

Amorphous Polyphosphate and Ca‐Carbonate Nanoparticles Improve the Self‐Healing Properties of both Technical and Medical Cements

Tolba

Wang

et al. 2020

Biotechnology Journal

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Cement is used both as a construction material and for medical applications. Previously, it has been shown that the physiological polymer inorganic polyphosphate (polyP) is morphogenetically active in regeneration of skin, bone, and cartilage. The present study investigates the question if this polymer is also a suitable additive to improve the self-healing capacity not only of construction cement but also of inorganic bone void fillers. For the application in the cement, two different polyP-based amorphous nanoparticles (NP) are prepared, amorphous Ca-polyP NP and amorphous Ca-carbonate (ACC) NP. The particles are integrated into poly(methyl methacrylate) in a concentration ratio of 1:10. This material applied onto Portland cement blocks either by brush application or by blow spinning strongly accelerates the self-healing property of the cement after a 10 day incubation period. Most likely, this process depends on bacteria and their membrane-associated alkaline phosphatase, resulting in the formation of calcite from ACC. In a second approach, polyP is integrated into a calcium-silicate-based cement used in reconstitutive medicine. Subsequently, the cement becomes softer and more elastic. The data show that bioinspired polyP/ACC NP are suitable additives to improve the self-healing of construction cement and to biologize bone cement.

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Section: Discussionmentioning

confidence: 99%

Amorphous Polyphosphate and Ca‐Carbonate Nanoparticles Improve the Self‐Healing Properties of both Technical and Medical Cements

Tolba

Wang

et al. 2020

Biotechnology Journal

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“…It is generally used as a lightweight alternative to glass, but also for other various applications, such as inks and coatings, or for microfabrication processes as sacrificial layer. Coan et al [29] reported the development of composite coatings of PMMA with hexagonal boron nitride (hBN) as filler, for metal surface protection against corrosion.…”

Section: Introductionmentioning

confidence: 99%

Reliability of Protective Coatings for Flexible Piezoelectric Transducers in Aqueous Environments

et al. 2019

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Electronic devices used for marine applications suffer from several issues that can compromise their performance. In particular, water absorption and permeation can lead to the corrosion of metal parts or short-circuits. The added mass due to the absorbed water affects the inertia and durability of the devices, especially for flexible and very thin micro-systems. Furthermore, the employment of such delicate devices underwater is unavoidably subjected to the adhesion of microorganisms and formation of biofilms that limit their reliability. Thus, the demand of waterproofing solutions has increased in recent years, focusing on more conformal, flexible and insulating coatings. This work introduces an evaluation of different polymeric coatings (parylene-C, poly-dimethyl siloxane (PDMS), poly-methyl methacrylate (PMMA), and poly-(vinylidene fluoride) (PVDF)) aimed at increasing the reliability of piezoelectric flexible microdevices used for sensing water motions or for scavenging wave energy. Absorption and corrosion tests showed that Parylene-C, while susceptible to micro-cracking during prolonged oscillating cycles, exhibits the best anti-corrosive behavior. Parylene-C was then treated with oxygen plasma and UV/ozone for modifying the surface morphology in order to evaluate the biofilm formation with different surface conditions. A preliminary characterization through a laser Doppler vibrometer allowed us to detect a reduction in the biofilm mass surface density after 35 days of exposure to seawater.

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“…Nanocomposite are materials having at least one phases with dimensions equals to less than 100 nm materials and have very good performance. Nanocomposite coatings using dipping process one of successful method that was used in the previous years, the second phase can be nitride particles (BN) [3], or hard oxide (TiO2) [4], etc. Poly methyl methacrylate (PMMA) is an important thermoplastic polymer that is transparent to visible light with a glass transition temperature of ~100 ℃ [5].…”

Section: …………………………………………………………………………………………………… Introduction:-mentioning

confidence: 99%