Ali Vaziri

Islamic Azad University, Science and Research Branch

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Amir Heydarinasab

Islamic Azad University, Science and Research Branch

Mehdi Ardjmand

Islamic Azad University South Tehran Branch

Eric J. Beckman

University of Pittsburgh

Ali Akbar Safekordi

Islamic Azad University, Science and Research Branch

Gholam Hossain Varshouee

Islamic Azad University, Science and Research Branch

Shadab Shahsavari

Islamic Azad University of Varamin

B. Warburton

University of London

Seyed Mehdi Ghafelebashi Zarand

Elham Moniri

Islamic Azad University of Varamin

Mehrdad Seifali Abbas‐Abadi

Ghent University

Cooperative Institutions

Islamic Azad University, Science and Research Branch

Islamic Azad University, Tehran

Amirkabir University of Technology

Sharif University of Technology

University of Tehran

Iran Polymer and Petrochemical Institute

University of Pittsburgh

Tehran University of Medical Sciences

Kerman University of Medical Sciences

Islamic Azad University, Shahr-e-Qods Branch

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Manipulation of mechanical and thermal properties of graphene oxide/nanoclay/unsaturated polyester hybrid nanocomposites by the surface chemistry and nanofiller composition

Polymer Testing (2023)

Ali Farshidfar Saeed Bazgir Ali Asghar Katbab Ali Vaziri

Dispersion of platelet-like nanominerals in low-viscous resins is a serious challenge; which arises from the strong interactions among the large surface area of the layers. Herein, we improved the dispersion of graphene oxide (GO) within unsaturated polyester (UP) resin and synergistically enhanced the mechanical and thermal properties of the resulting nanocomposites. In a multi-stage manner, GO was incorporated into a novel hybrid structure before adding to the polymer matrix alongside with benefited from the advantage of surface functionalization. Functional hybrid nanofiller skeletons comprising GO and nanoclay (NC) were designed and prepared at different composition ratios (25:75, 50:50 and 75:25) and different surface chemistries via modification with two thermal-resistant silane coupling agents, namely (3-Aminopropyl) triethoxysilane (APTES) and 3-(trimethoxysilyl) propyl methacrylate (MPS). The optimal loading of different hybrid structures into UP has been examined by applying three loading levels (0.25, 0.50 and 1.00 wt%). The results indicated the synergistic effects of GO and NC on the mechanical properties of UP, where the composition ratio of the hybrid constituents played a key role. Moreover, it was demonstrated that the range of composition ratio for the realization of synergistic reinforcement is strongly affected by the surface chemistry of the GO and NC. For UP matrix reinforced with APTES-modified hybrid nanofillers of GD:CD at 50:50 w/w composition, a higher tensile modulus compared to blank UP (≈+21.5%) was obtained due to boosted dispersion of nanoplatelets in UP matrix. The results of DMTA and TGA analyses suggested that there are two different UP/GO and UP/NC interfacial interactions in the composites containing unmodified hybrid nanofillers. However, after modification of hybrid nanofillers, the homogeneous dispersion of nanoplatelets boosted the interfacial interactions between nanofillers and polymer, such that higher properties were obtained.

Triethoxysilane

Surface Modification

Hybrid material

10.1016/j.polymertesting.2023.107951

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Citations (12)

Rheological and morphological behaviors of polyamide 6/acrylonitrile–butadiene–styrene/nanoclay nanocomposites

Journal of Thermoplastic Composite Materials (2013)

Azim Mojarrad Ahmad Ramazani Ismaeel Ghasemi Ali Vaziri

In this study, the effect of nanoclay on the rheological and morphological properties of polyamide 6 (PA6)/acrylonitrile–butadiene–styrene (ABS) blends was investigated. The scanning electron microscopy micrographs showed that with increment in the nanoclay content, the dispersed phase droplets size and their polydispersity index decreased, and the finer and more uniform dispersed phase was obtained. The transmission electron microscopy micrographs of nanocomposites indicated well-dispersed nanoclay tactoids in the polymer matrix produced by exfoliation of the nanoclay in the polymeric blends. Dynamic strain sweep experiments showed that the extent of the linear viscoelastic region is sensitive to the nanoclay content and compatibilizer. With increasing nanoclay content in the blend, the extent of the linear viscoelastic region decreased. On the other hand, the rheological measurements revealed that the nanoclay content has a significant effect on the moduli and complex viscosity of the blends. These results have indicated that with increasing nanoclay content the storage modulus ( G′), loss modulus ( G′′) and complex viscosity ( η*) increased. In addition, the results of creep experiments revealed that with the addition of compatibilizer (polyethylene octene elastomer grafted with maleic anhydride) and nanoclay to PA6/ABS blends, creep and recovery strain, over time, decreased remarkably and the recovery percentage increased. It was concluded that there is a good conformity between the results obtained from morphological and rheological investigations.

Maleic anhydride

Rheometry

Acrylonitrile butadiene styrene

10.1177/0892705712473626

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Citations (9)

OPTIMIZATION OF DEMULSIFIER FORMULATION FOR SEPARATION OF WATER FROM CRUDE OIL EMULSIONS

Brazilian Journal of Chemical Engineering (2015)

Pegah Hajivand Ali Vaziri

In this study, various water-soluble and oil-soluble demulsifiers were selected for separation of water from crude oil emulsions and their productivity measured using the Bottle-test method at 70 °C and 10 ppm concentration. The best ones among 23 demulsifiers examined through the screening process were fatty alcohol ethoxylate, triethanol amine and urea from the water-soluble group and Basororol E2032, Basorol PDB 9935 and TOMAC from the oil-soluble category. Furthermore, the present study investigated the factors effective for demulsification such as temperature, concentration, pH, salinity and modifiers. It was found that the separation improves with increasing demulsifier concentration, increasing salt content, increasing temperature up to 80 °C, keeping the pH values between 5-9. Adding solvent modifiers proved unnecessary. Two formulations were prepared based on suggested optimal concentrations of demulsifier content by experimental design using Qualitec 4 and these proved to be highly effective in treating real and synthetic emulsions.

Demulsifier

10.1590/0104-6632.20150321s00002755

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Citations (102)

Improvement of PAN separator properties using PVA/malonic acid by electrospinning in lithium ion‐batteries

Journal of Applied Polymer Science (2020)

Fartash Khodaverdi Ali Vaziri Mehran Javanbakht Mehdi Jahanfar

Abstract The prominent objective of this study is to improve the thermal shrinkage and wettability of lithium‐ion battery membrane separators based on Polyacrylonitrile (PAN) formed using an electrospinning technique. To achieve this goal, a PAN blended with highly hydrophilic Polyvinylalcohol (PVA) is formed, using malonic acid (MA) as a cross‐linker. Due to the excellent hydrophilic properties of PVA and the network formation inside the separators (because of the MA crosslinker presence), the results show significant improvement in the separator properties. For this reason, at the optimum concentrations of 5 wt.% PVA and 5 wt.% MA (sample F4), an increase of wettability (contact angle from 85° for pure PAN to 42° for the F4 separator) is able to be seen. The electrolyte uptake was significantly increased, as for the F4 sample is increased to 1,150%, which is 2.67 times higher than the PAN with 430%. The improved separators showed higher porosity, better tensile strength, lower thermal shrinkage, and better electrochemical performance than the pure PAN separator. It showed an ion conductivity of 3.03 mS/cm, a wide electrochemical stability window of 5.2 V and an initial discharge capacity of 156.4 mAh/g.

Separator (oil production)

Electrospinning

Polyacrylonitrile

Thermal Stability

Shrinkage

10.1002/app.50088

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Citations (18)

Synthesis of chitosan-zirconium magnetic nanofibers and its application for arsenic adsorption from wastewater: Kinetics and isotherms studies

DOAJ (DOAJ: Directory of Open Access Journals) (2020)

Azadeh Modiri Shadab Shahsavari Ali Vaziri Ali Akbar Seifkordi

Source

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Fabrication and characterization of antimicrobial starch‐based nanocomposite films and modeling the process parameters via the RSM

Polymer Composites (2018)

Sanaz Mohammadpour Velni Hossein Baniasadi Ali Vaziri

The main aim of this study is the design and fabrication of degradable nanocomposite films composed of starch/gelatin (S/G)/SiO 2 suitable for food packaging applications. Response surface methodology (RSM) was applied to design the fabrication process and to investigate the effect of S/G weight ratio and SiO 2 weight percent (wt.%) on the mechanical and barrier properties of the prepared samples. The results revealed that tensile strength and modulus were increased with increasing S/G wt. ratio and introducing SiO 2 into the polymer matrix, while elongation at break and water vapor permeability (VWP) decreased. The process optimization was done and various properties of the optimized films such as morphological properties, thermal properties, VWP, degradability, and antibacterial properties were investigated. It was found that the thermal stability of the optimized sample as well as its barrier property against water vapor were improved dramatically as SiO 2 presented into the matrix due to proper dispersion and interaction of nanoparticles with the polymer matrix as also confirmed via scanning electron microscopy images. Furthermore, SiO 2 has brought significant antibacterial properties for the S/G matrix that is a notable feature for food packaging films. Overall, the results of the current study confirm the S/G/SiO 2 compounding could be proper candidate for fabrication of antibacterial degradable food packaging films. POLYM. COMPOS., 39:E584–E591, 2018. © 2018 Society of Plastics Engineers

Compounding

Thermal Stability

10.1002/pc.24733

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Citations (14)

Estimation of pressure drop of single-phase flow in horizontal long pipes using artificial neural network

Iranian Journal of Chemistry & Chemical Engineering-international English Edition (2021)

Fahime Gharekhani Mehdi Ardjmand Ali Vaziri

Large- pressure drop and drag along the pipe route is one of the problems with fluid transfer lines. For many years, various methods have been employed to reduce the drag in fluid transmission lines. One of the best ways for this purpose is reducing friction coefficients by utilizing drag lowering materials. Experimentally by adding minimal amounts of this material at the ppm scale to the lines and reducing the drag of the flow, fluid can be pumped without the need to change the size of the pipe. In this study, the effect of carboxymethylcellulose biopolymer on the water flow reduction in a 12.7- and 25.4-mm galvanized pipe was investigated. In order to have a comprehensive analysis of process conditions, experiments were carried out with three different levels of concentrations, flow rate and temperature. Also, as a new innovation in this investigation, the outputs of the experimental data were evaluated and analyzed using the Taguchi method and neural network system, and optimized through a genetic algorithm. In this study, the highest rate of drag reduction will be achieved at 39 ° C and at a concentration of 991.6 ppm and flow rate of 1441.1L/h was 59.83% at 12.7-mm diameter.

10.30492/ijcce.2021.141676.4450

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Adsorption of Phenol in Wastewater Using Nano Grapheme Oxide-Chitosan-Bentonite Absorbent

Depiction of Health (2020)

Alireza Jadid Shadab Shahsavari Seifkordi Aliakbar Ali Vaziri

Background and Objectives: Contamination of surface and groundwater sources with aromatic compounds such as phenolic compounds is one of the newest environmental problems that humans encountered it today. One of the ways to remove these pollutants is the use of polymeric adsorbents. In this study, chitosan-bentonite-nano-graphene oxide nanosorbent was synthesized to investigate the phenol adsorption. Material and Methods: In this research, experimental design was performed using Design-Expert 7.0 software to investigate the effect of independent variables including nano graphene oxide, chitosan and bentonite on the dependent variable (phenol removal rate). Moreover, phenol absorption isotherm, kinetics and thermodynamics, were also examined. Results: Eventually, the optimum formulation of nano-adsorbent with specifications of 0.1 g of chitosan, 0.18 g of bentonite and 0.07 g of nano-graphene oxide was investigated. Optimal adsorption conditions were also obtained at a concentration of 100 ppm, pH=5 and 45 minutes of absorption time. Conclusion: Finally, it was found that the synthesized nanosorbent follows the Langmuir isotherm, which represents physical adsorption, and also the kinetics of the adsorption process is the diffusion between particles. As a result, it was found that the optimal application of this nano-adsrbent is in wastewaters with a temperature of less than 400 °C.

Bentonite

Langmuir adsorption model

10.34172/doh.2020.44

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Citations (1)

A Mathematical Model for Investigating the Effect of Reaction Temperature and Hydrogen Amount on the Catalyst Yield during Propylene Polymerization

Kemija u industriji (2019)

Gholam Hossain Varshouee Amir Heydarinasab Ali Vaziri Seyed Mehdi Ghafelebashi Zarand

In this study, the effect of reaction temperature and hydrogen amount, as the most effective process variables on the Ziegler-Natta catalysts yield during propylene polymerization, was investigated with the aid of a validated mathematical model. The approach applied in this modelling was the polymer moment balance technique (population balance approach) derived from the statistics expected value. The model was coded in MATLAB® & Simulink®, and then validated by experimental data coming from a laboratory-scale reactor. The main target of this study was to gain considerable insight into Ziegler-Natta catalyst performance against variables change. The model might be applicable for catalyst makers to evaluate and improve their catalysts, and could also be useful for process chemical engineers to easily operate the plant, replace new catalyst, optimise process conditions, generate new formulation for a new grade, and use maximum catalytic potential. Accordingly, the model could be applied in basic and applied research in this field.

10.15255/kui.2018.048

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Citations (4)

Kinetic study of the synthesis of expandable polystyrene via “multi-stage initiator dosing” method

Journal of Polymer Research (2015)

Fahimeh Derakhshanfard Naghmeh Fazeli Ali Vaziri Amir Heydarinasab

Polystyrene

Bulk polymerization

Suspension polymerization

Precipitation polymerization

10.1007/s10965-015-0766-7

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Citations (2)