Improved self-healing performance of polymeric nanocomposites reinforced with talc nanoparticles (TNPs) and urea-formaldehyde microcapsules (UFMCs)

Habib, Sehrish; Fayyed, Eman; Shakoor, Abdul; Kahraman, Ramazan; Abdullah, Aboubakr M.

doi:10.1016/j.arabjc.2020.102926

Cited by 29 publications

(16 citation statements)

References 52 publications

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“…Moreover, in the DLPC equivalent circuit shown in Figure B, the top layer offered an extra time constant connected in series with the SLPC equivalent circuit, which has R po1 and CPE L1 as pore resistance improvises capacitance. It is worth mentioning that the CPE admittance, which is related to the surface roughness, surface inhomogeneity of the coating, and/or the nonuniform spreading of the current over the coating surface can be designed using the below eq where Y 0 is the constant of CPE that equals to the (1/| Z |) at ω = 1 rad/s, ω is the angular frequency for the AC signal (1/rad), j is the imaginary number, and n is the CPE exponent. As n extends to 1, the CPE displays the ideal capacitor behavior.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Moreover, in the DLPC equivalent circuit shown in Figure 9B, the top layer offered an extra time constant connected in series with the SLPC equivalent circuit, which has R po1 and CPE L1 as pore resistance improvises capacitance. It is worth mentioning that the CPE admittance, which is related to the surface roughness, surface inhomogeneity of the coating, and/or the nonuniform spreading of the current over the coating surface 70 can be designed using the below eq 8 71…”

Section: Resultsmentioning

confidence: 99%

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Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Hassanein

Khan

Fayyad

et al. 2021

ACS Appl. Mater. Interfaces

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Smart polymeric composite coatings demonstrating multilevel self-healing characteristics were developed and characterized. The pHresponsive smart carriers were synthesized by loading halloysite nanotubes (HNTs) with the benzotriazole corrosion inhibitor (BTA) using the vacuum cycling method, referred to as (BTA-loaded HNTs). Similarly, mechanically triggered melamine urea-formaldehyde microcapsules encapsulated with the boiled linseed oil-self-healing agent (LO) denoted as (MUFMCs) having an average size of a ∼120 μm diameter with a wall thickness of ∼1.84 μm were synthesized by the in situ polymerization technique. The newly designed double-layered smart polymeric composite coatings (DLPCs) were developed by mixing 3 wt % BTA-loaded HNTs with epoxy and applying it on the clean steel substrate to form a primer layer. After its complete curing, a top layer of epoxy containing 5 wt % of MUFMCs was deposited on it. For an exact comparison, single-layer polymeric composite coatings (SLPCs) containing 3 wt % BTA-loaded HNTs were also developed. The Fourier transform infrared radiation spectra of MUFMCs and BTA-loaded HNTs indicate the existence of all desired functional groups, confirming the presence of loaded chemical species such as LO and BTA into the smart carriers. Thermogravimetric analysis (TGA) indicates that ∼18% BTA is successfully loaded into HNTs. Quantitative UV-spectroscopic analysis indicates a pH-responsive release of BTA from BTA-loaded HNTs, which is time-dependent, attaining its maximum value of ∼ 90% in an acidic medium after 30 h. Electrochemical impedance spectroscopy analysis conducted in 3.5 wt % NaCl solution at room temperature for different immersion times reveals that SLPC exhibits the maximum chargetransfer resistance (R ct ) of 55.47 GΩ cm 2 after the 7th day of immersion, and then, a declining trend is observed, reaching 26.6 GΩ cm 2 after the 9th day. However, in the case of DLPC, the R ct values show a continuous increment, attaining a maximum value of 82.11 GΩ cm 2 after the 9th day of immersion. The improved performance of DLPC can be ascribed to the efficient triggering of the individual carriers in the isolated matrices, resulting in the release of LO and BTA to form individual protective films at the damaged area due to the oxidative polymerization process and triazoles' ability of passive film formation on the substrate, respectively. The tempting self-healing properties of DLPCs justify their decent role for long-term corrosion protection in many industrial applications.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Hassanein

Khan

Fayyad

et al. 2021

ACS Appl. Mater. Interfaces

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“…Furthermore, the relationships between leaders and nurses also have significant impact on their task performance. Habib et al (2021) point out the importance of keeping an effective communication and a harmonious relationship between leader and nurse in the hospital. The positive relationships between interpersonal leadership, engagement and task performance also are highlighted in this research.…”

Section: Task Performancementioning

confidence: 99%

The development of k-worker's task performance: an empirical research based on the Chinese context

Che

Fakhrorazi

Loke

et al. 2021

JOCM

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PurposeThis study examines the effect of knowledge workers' (k-workers') leader-member exchange (LMX) on task performance and the mediation effect of affective commitment and organizational citizenship behavior (OCB) in China.Design/methodology/approachIn this study, 384 qualified questionnaires will be collected from k-workers in China by using a self-administered survey, and the partial least square structural equation modeling (PLS-SEM) technique was employed for data analysis.FindingsThis finding showed that LMX has positive relationship on affective commitment, organizational citizenship behavior and task performance. The result also confirmed the mediation effect of organizational citizenship behavior on the relationship between LMX and task performance.Originality/valueThis research provide some implement to manage, motivate and inspire the k-workers and finally promote the organizational performance.

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“…At this stage, the adhesion of the coating to the substrate plays a crucial role in avoiding delamination and consequent corrosion expansion [27]. After water/electrolytes permeate the structural flaws of the coatings and/or reaches the metal interface, smart coatings that contain corrosion inhibitors or self-healing agents can affect the interface in terms of charge transfer and the formation of a passive film or by restoring the barrier properties, thus extending the protection and the coatings' service life [33][34][35][36]. The characterization of passive and active coatings includes in-depth knowledge of structure, morphology, and composition, along with the barrier properties assessed by conventional and localized electrochemical testing.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Characterization of Polymeric Coatings for Corrosion Protection: A Review of Advances and Perspectives

et al. 2022

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The development of anti-corrosion polymeric coatings has grown exponentially in the fields of material science, chemistry, engineering, and nanotechnology during the last century and has prompted the evolution of efficient characterization techniques. Nowadays, polymeric coatings represent a well-established protection system that provides a barrier between a metallic substrate and the environment. However, the increase in complexity and functionality of these coatings requires high-precision techniques capable of predicting failures and providing smart protection. This review summarizes the state of the art for the main electrochemical techniques, emphasizing devices that track the anti-corrosion properties of polymeric coatings from the macroscale to the nanoscale. An overview of the advances in accelerated corrosion testing and the electrochemical characterization of coatings is explored, including insights into their advantages and limitations. In addition, the challenges and potential applications of the theoretical approaches are summarized based on current knowledge. Finally, this work provides the reader with the trends and challenges of designing future technologies and models capable of tracking corrosion and predicting failures.

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Improved self-healing performance of polymeric nanocomposites reinforced with talc nanoparticles (TNPs) and urea-formaldehyde microcapsules (UFMCs)

Cited by 29 publications

References 52 publications

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

The development of k-worker's task performance: an empirical research based on the Chinese context

Electrochemical Characterization of Polymeric Coatings for Corrosion Protection: A Review of Advances and Perspectives

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