Graphene/polyurethane nanocomposite coatings – Enhancing the mechanical properties and environmental resistance of natural fibers for masonry retrofitting

Abbass, Ali; Paiva, Maria C.; Oliveira, Daniel V.; Lourénço, Paulo B.; Fangueiro, Raúl

doi:10.1016/j.compositesa.2022.107379

Cited by 14 publications

(4 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absorption peak at 3350 cm −1 is attributed to the NH stretching vibration and the tiny peak at 1575 cm −1 is caused by the NH bending vibration 49 . The absorption peak at 1370 cm −1 is due to the stretching vibration of CN 50,51 . In addition, there are slight differences between two types of PUEs, one PUEs are prepared with the participation of the alcoholysis products and the another are prepared directly with original polyester diols.…”

Section: Resultsmentioning

confidence: 99%

“…39,48 The absorption peak at 3350 cm À1 is attributed to the N H stretching vibration and the tiny peak at 1575 cm À1 is caused by the N H bending vibration. 49 The absorption peak at 1370 cm À1 is due to the stretching vibration of C N. 50,51 In addition, there are slight differences between two types of PUEs, one PUEs are prepared with the participation of the alcoholysis products and the another are prepared directly with original polyester diols. In the spectra of the PUE (BLOCK-PET), PUE (PCL-PET), PUE (PCDL-PET) and PUE (PBA-PET), the absorption peak at 1020 cm À1 is attributed to the in-plane bending vibration of C H in the benzene ring, besides, the absorption peak at 873 cm À1 is derived from the outof-plane bending vibration of C H in the benzene ring.…”

Section: The Characterization Of the Prepared Puesmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of high‐performance polyurethane elastomers via direct use of alcoholyzed waste PET by high molecular weight polyester diols

Liu

Hao

Zhang

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 99%

Section: The Characterization Of the Prepared Puesmentioning

confidence: 99%

Preparation of high‐performance polyurethane elastomers via direct use of alcoholyzed waste PET by high molecular weight polyester diols

Liu

Hao

Zhang

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Increased surface area leads to increased conductivity and, as a result, less resistance. Te efective conductivity in the axial direction, i.e., normal to the plane of the nanoscale RVE, is calculated by averaging of the local conductivities of the nanoscale RVE, assuming that the electron hopping pathways extend through the length of infnitely long CNTs [46][47][48].…”

Section: Electrical Analysis Of Rve Model Under Mechanicalmentioning

confidence: 99%

Study on Interfacial Interaction of Cement-Based Nanocomposite by Molecular Dynamic Analysis and an RVE Approach

Roopa,

Hunashyal,

Patil

et al. 2023

Advances in Civil Engineering

View full text Add to dashboard Cite

There is an increased demand for cement nanocomposites in the twenty-first century due to their composition, higher strength, high efficiency, and multiscale nature. As carbon nanotubes (CNTs) possess extremely high strength, resilience, and stiffness, inclusion of carbon nanotubes in small quantities to the concrete mix makes them a multifunctional material. A molecular level understanding is significant to capacitate the macrolevel properties of these composites. In the proposed work, molecular dynamics (MD) simulations are used to understand the behaviour of the composites at the atomic level and continuum mechanics with representative volume element (RVE) homogenization modelling is carried out for interfacial interaction study of composites. The mechanical properties such as Young’s modulus, shear modulus, and poisons are evaluated using previous methods of simulations for different compositions of nanomaterials in cement matrix. The FORCITE module of MD simulation and square RVE model is used to determine the mechanical, electrical properties, and elastic constants of the cement nanocomposite. The MD simulation describes the linking effect of CNT into cement matric, and the RVE modelling study reveals the pull-out effect of CNT from matrix. From experimental and analytical studies, it is found that increase in CNT till 0.5% weight fraction increases the mechanical properties about 12% and further increasing of CNT weight fraction causes a reduction in mechanical properties about 5% due to the agglomeration of nanotubes. The density of states method in MD simulation indicates that mobility of the electrons increases with an increase in carbon nanotube proportion in the composites. The experimental test results substantiate the analytical studies, and the error obtained from both approaches is less than 20%. From the analytical study, the average maximum Young’s modulus, shear modulus, and bulk modulus are obtained as 46 GPa, 31 GPa, and 32 GPa for 0.5% weight fraction of CNT in cement matrix. Hence, it is concluded that 0.5% weight fraction of CNT is considered as optimum dosage to obtain better electrical and mechanical properties.

show abstract

“…Furthermore, concerns are raised regarding the environmental impact of resin-based coatings. Recently, the use of tailored graphene/polyurethane nanocomposite coatings has been proposed [ 18 ]. This solution is promising as it can enhance the tensile properties and environmental resistance of yarns without compromising sustainability.…”

Section: Natural Fiber Reinforcementmentioning

confidence: 99%

Design of Strain-Hardening Natural TRM Composites: Current Challenges and Future Research Paths

2023

Self Cite

View full text Add to dashboard Cite

This paper discusses the challenges in using natural fibers for the development of textile-reinforced mortar (TRM) composites with pseudo-strain-hardening and multiple cracking behavior. The particular characteristics of natural vegetal fibers are analyzed with reference to data from the literature. It is concluded that the efficient use of these fibers as composite reinforcement requires the development of treatment or impregnation protocols for overcoming durability issues, eliminating crimping effects in tensile response and imparting dimensional stability. Relevant experimental research on the synthesis and performance of natural TRMs is reviewed, showing that the fabrication of such systems is, at present, largely based on empirical rather than engineering design. In order to set a framework regarding the properties that the constituents of natural TRM must meet, a comparative analysis is performed against inorganic matrix composites comprising synthetic, mineral and metallic reinforcement. This highlights the need for selecting matrix materials compatible with natural fibers in terms of stiffness and strength. Furthermore, a rational methodology for the theoretical design of natural TRM composites is proposed. First-order analysis tools based on rule-of-mixtures and fracture mechanics concepts are considered. Based on the findings of this study, paths for future research are discussed.

show abstract

Graphene/polyurethane nanocomposite coatings – Enhancing the mechanical properties and environmental resistance of natural fibers for masonry retrofitting

Cited by 14 publications

References 43 publications

Preparation of high‐performance polyurethane elastomers via direct use of alcoholyzed waste PET by high molecular weight polyester diols

Preparation of high‐performance polyurethane elastomers via direct use of alcoholyzed waste PET by high molecular weight polyester diols

Study on Interfacial Interaction of Cement-Based Nanocomposite by Molecular Dynamic Analysis and an RVE Approach

Design of Strain-Hardening Natural TRM Composites: Current Challenges and Future Research Paths

Contact Info

Product

Resources

About