Mehrad Amirkhosravi

Mehrad Amirkhosravi
Case Western Reserve University | CWRU · Department of Macromolecular Science and Engineering

Doctor of Philosophy

About

32
Publications
10,861
Reads
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424
Citations
Additional affiliations
August 2019 - present
Case Western Reserve University
Position
  • Research Associate
January 2014 - May 2019
University of Oklahoma
Position
  • Research Assistant
September 2008 - May 2011
Sharif University of Technology
Position
  • PhD Student

Publications

Publications (32)
Article
Full-text available
In recently developed magnet assisted composite manufacturing (MACM) processes, a magnetic consolidation pressure is applied on composite laminates by a set of permanent magnets during fabrication. This magnetic pressure was shown to provide considerable benefits such as increased fiber volume fraction, improved mechanical properties, and reduced v...
Article
Improving the electrical conductivity of elastomer composites while maintaining their favorable mechanical properties is crucial in a wide range of applications such as strain sensors for wearable devices and electronic skins. Herein, a facile and scalable strategy, i.e., dusting technology, is proposed to fabricate conductive elastomer composites...
Article
Epoxy/anhydride cured thermosets are widely used in aerospace and wind energy structures. Recycling the enormous amounts of epoxy thermoset waste remains a global challenge. Vitrimerization, a practical, low-cost, eco-friendly and scalable method was developed for closed-loop recycling of the crosslinked epoxy by converting the permanent network in...
Article
The use of thermoplastic polyurethane (TPU) films as a lightweight elastomer has grown continuously over the years due to their good mechanical properties and excellent chemical and corrosion resistance. Yet, the high-temperature mechanical performance of TPU elastomers needs to be improved for extending their application as metal counterparts. In...
Article
The novel vitrimerization concept of converting permanently cross-linked networks of thermoset polymers into dynamic exchangeable networks often relies on transesterification reactions. Transesterification exchange reactions, for example, in epoxy vitrimers, are usually contingent on equivalent ratios of hydroxyl to ester groups and large amounts o...
Article
Full-text available
Unsaturated polyester resins (UPRs) are expansively used in different applications and recycling the significant amounts of UPR waste is still a universal problem. Vitrimerization is a feasible, environmental‐friendly, cost effective, and operative method, which can be used for recycling the crosslinked UPRs. In this method, the thermoset permanent...
Article
Mechanochemical vitrimerization, as a method to recycle cross-linked thermosets by converting the permanent network into a recyclable and reprocessable vitrimer network, inevitably requires a catalyst to accelerate the bond exchange reactions. Here, we demonstrate a catalyst-free approach to achieve the recycling of a cross-linked biobased epoxy in...
Article
A network of poly(tetrafluoroethylene) (PTFE) microfibers in a thermoplastic polyurethane (TPU) was prepared by melt mixing the TPU with solid PTFE particles. The effect of rotor speed on the fiber dimensions was investigated. Higher shear stress was found to be the critical parameter for producing thinner PTFE fibers, rather than the shear rate im...
Article
A network of poly(tetrafluoroethylene) (PTFE) microfibers in a thermoplastic polyurethane (TPU) was prepared by melt mixing the TPU with solid PTFE particles. The effect of rotor speed on the fiber dimensions was investigated. Higher shear stress was found to be the critical parameter for producing thinner PTFE fibers, rather than the shear rate im...
Article
Full-text available
The controlled orientation of short fibers on the surface of structural laminates while obtaining good dispersion and uniform spatial distribution is highly desirable. In this paper, a new magnetic field assisted fabrication method is proposed to align nickel coated carbon (NiC) fibers on the surface of ternary NiC/glass/epoxy laminates. Excellent...
Conference Paper
Full-text available
This paper proposes a simple and accurate technique to quantify both fiber and void volume fractions of natural fiber composites. This technique involves the separate pyrolysis of natural fibers, polymer resin, and natural fiber/polymer composite in a pure nitrogen atmosphere. The remained fractional residuals of these materials are used for the de...
Article
Full-text available
Fabrication of multifunctional materials via incorporation of the third component into structural composite laminates is of great interest, especially for manipulating surface properties. However, achieving a uniform, well‐dispersed surface microstructure in ternary composites is quite challenging by using the traditional fabrication processes. In...
Conference Paper
Full-text available
Short carbon fibers have excellent mechanical properties and high electrical conductivity which make them a suitable reinforcement for polymer composites. It is well-known that the mechanical and electrical properties of polymeric composites can be tailored by controlling the orientation of these fibers. There are different methods to produce compo...
Conference Paper
Full-text available
During manufacturing of high-quality composite laminates, an elevated pressure is often applied over the laminate to increase the fiber content, reduce process-induced defects, and achieve enhanced interlaminar consolidation. In processes involving a vacuum bag, such as wet lay-up and vacuum assisted resin transfer molding, the consolidation pressu...
Article
Full-text available
With growing environmental awareness, natural fibers have recently received significant interest as reinforcement in polymer composites. Among natural fibers, silk can potentially be a natural alternative to glass fibers, as it possesses comparable specific mechanical properties. In order to investigate the processability and properties of silk rei...
Article
Vacuum-assisted resin transfer molding (VARTM) has several inherent shortcomings such as long mold filling times, low fiber volume fraction, and high void content in fabricated laminates. These problems in VARTM mainly arise from the limited compaction of the laminate and low resin pressure. Pressurized infusion (PI) molding introduced in this pape...
Article
Full-text available
This study presents a novel method to fabricate high-quality, large composite parts which can be used in a wet lay-up/vacuum bag (WLVB) process. The new method utilizes a commercial lifting magnet, which is commonly used for transporting ferrous plates, to apply a magnetic consolidation pressure on the WLVB composite lay-up. The pressure is applied...
Conference Paper
Full-text available
Carbon fibers are widely used as reinforcement in polymer-matrix composites due to their excellent mechanical properties combined with their lightweight. Coating of short carbon fibers with nickel not only preserves the desired specific mechanical properties of both the fiber and the resulting composite but also improves their electrical conductivi...
Article
Full-text available
Voids are the most common process-induced defects in composite laminates fabricated by vacuum assisted resin transfer molding (VARTM). Reduction or total elimination of these defects is essential for the improved performance and long-term durability of the structural composites. This study introduces a novel method that reduces the void content in...
Conference Paper
Full-text available
Application of natural fibers in polymer composites has been gaining popularity in several industries pursuing environmentally friendly products. Among the natural fibers with proven potential applications, silk fibers have recently received considerable attention from researchers. Silk fibers provide higher mechanical properties compared to other...
Article
Full-text available
This work demonstrates a protocol to improve the quality of composite laminates fabricated by wet lay-up vacuum bag processes using the recently developed magnet assisted composite manufacturing (MACM) technique. In this technique, permanent magnets are utilized to apply a sufficiently high consolidation pressure during the curing stage. To enhance...
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Conference Paper
Full-text available
This paper demonstrates the feasibility of using high-power, permanent magnets in developing high consolidation pressure during a variety of fabrication methods for composite laminates. First, the salient features of this new manufacturing method, expected enhancement of the mechanical properties, and possible improvements in part quality are discu...
Conference Paper
This paper presents the application of a new technique, Magnet Assisted Composite Manufacturing (MACM), to enhance the quality of composite laminates fabricated by wet lay-up/vacuum bag (WLVB) and vacuum assisted resin transfer molding (VARTM). Towards this goal, a set of high-power, Neodymium permanent magnets, which are placed on a magnetic tool...
Article
Full-text available
A novel fabrication method, Magnet Assisted Composite Manufacturing (MACM), is developed to produce high-quality composite laminates out of an autoclave. This technique involves the placement of high-temperature Neodymium permanent magnets on a vacuum bag to generate sufficiently high consolidation pressure during cure, thus eliminating the necessi...
Article
Full-text available
A novel method, Magnet Assisted Composite Manufacturing (MACM), which utilizes a magnetic compressive pressure, is proposed to improve laminate quality in wet lay-up/vacuum bag (WLVB) processes. This paper first describes the salient features of MACM/WLVB process, and then demonstrates the effectiveness of this process by investigating the void con...
Article
Full-text available
This study describes a multidimensional 3D/lumped parameter (LP) model which contains appropriate inflow/outflow boundary conditions in order to model the entire human arterial trees. A new extensive LP model of the entire arterial network (48 arteries) was developed including the effect of vessel diameter tapering and the parameterization of resis...

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