Navid Tajaddod

Northeastern University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Marilyn L. Minus

Northeastern University

Kenan Song

Arizona State University

Jiangsha Meng

Northeastern University

Yiying Zhang

University of Science and Technology Beijing

Heng Li

Southern University of Science and Technology

Yiying Zhang

Chengdu Medical College

John P. Abdou

Ames Research Center

Yiying Zhang

Tianjin University of Science and Technology

V. Reguero

IMDEA Materials

Shanju Zhang

North China University of Water Resources and Electric Power

Cooperative Institutions

Northeastern University

California Polytechnic State University

Universidad del Noreste

Southern University of Science and Technology

Semiconductor Manufacturing International (China)

IMDEA Materials

Foundation for the Research Development and Application of Composite Materials

University of Cambridge

Purdue University West Lafayette

Massachusetts Institute of Technology

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Improving Multi-Functional Properties in Polymer Based Nano Composites by Interfacial

Navid Tajaddod

Source

Cite

Citations (0)

Structural Polymer-Based Carbon Nanotube Composite Fibers: Understanding the Processing–Structure–Performance Relationship

Materials (2013)

Kenan Song Yiying Zhang Jiangsha Meng Emily Green Navid Tajaddod

Among the many potential applications of carbon nanotubes (CNT), its usage to strengthen polymers has been paid considerable attention due to the exceptional stiffness, excellent strength, and the low density of CNT. This has provided numerous opportunities for the invention of new material systems for applications requiring high strength and high modulus. Precise control over processing factors, including preserving intact CNT structure, uniform dispersion of CNT within the polymer matrix, effective filler–matrix interfacial interactions, and alignment/orientation of polymer chains/CNT, contribute to the composite fibers’ superior properties. For this reason, fabrication methods play an important role in determining the composite fibers’ microstructure and ultimate mechanical behavior. The current state-of-the-art polymer/CNT high-performance composite fibers, especially in regards to processing–structure–performance, are reviewed in this contribution. Future needs for material by design approaches for processing these nano-composite systems are also discussed.

Specific strength

10.3390/ma6062543

Cite

Citations (242)

Polyethylene‐Assisted Exfoliation of Hexagonal Boron Nitride in Composite Fibers: A Combined Experimental and Computational Study

Macromolecular Chemistry and Physics (2015)

Jiangsha Meng Navid Tajaddod Steven W. Cranford Marilyn L. Minus

A joint experimental and computational approach is used to explore the exfoliation mechanism for hexagonal boron nitride (h‐BN) in polyethylene (PE)/h‐BN composite fibers during hot‐drawing. A shear‐flow gel‐spinning apparatus is utilized to fabricate PE/h‐BN composite fibers with 11 wt% h‐BN loading. Different exfoliation states of the h‐BN platelets before and after hot‐drawing are experimentally examined using wide‐angle X‐ray diffraction and Raman spectroscopy. Compared with the undrawn (as‐spun) fibers, both analyses show that the intensity of the major h‐BN peaks attributed to interlayer interaction significantly decreased for the drawn fibers, suggesting exfoliation of the h‐BN. A full atomistic steered molecular dynamics approach is used to obtain baseline force and work required for h‐BN layer separation, as well as to simulate the h‐BN exfoliation behavior as a result of the PE matrix shearing effect in the composite. Computational results indicate that a large interactive area between the polymer and the fillers is required to induce enough stress transfer to exceed the h‐BN exfoliation force/energy threshold. Once this threshold is achieved, complete exfoliation of the platelets to monolayer h‐BN is demonstrated. By understanding the relationship between interfacial area and interaction strength between polymer matrix and fillers, this work provides new insight toward use of polymers for producing mono‐ and few‐layered h‐BN. image

Exfoliation joint

10.1002/macp.201400585

Cite

Citations (22)

Exfoliation of Boron Nitride Platelets by Enhanced Interfacial Interaction with Polyethylene

Macromolecular Materials and Engineering (2016)

Navid Tajaddod Kenan Song Emily C. Green Yiying Zhang Marilyn L. Minus

Hexagonal boron nitride (BN) platelets are used for fabrication of ultrahigh molecular weight polyethylene (UHMWPE)/BN composite fibers using a flow‐crystallization process. As‐spun fibers are subsequently drawn near the UHMWPE melting temperature. Interfacial crystallization of UHMWPE is observed on the surfaces of the BN platelets. Both X‐ray and Raman spectroscopy analysis of the drawn composite fibers show a significant decrease in the intensity of the signature BN peaks associated with the platelet interlayer spacing, as compared to undrawn samples. This suggests exfoliation of the BN platelets occurs during the fiber hot‐drawing process. Exfoliation of BN platelets is induced due to interfacial stress transfer between both components (i.e., UHMPWE and BN) within the composites. This stress transfer is facilitated by molecular rearrangement of polymer matrix during drawing (i.e., unfolding of the polymer chain). The changes in micro‐ and nanoscale morphologies due to unfolding of the polymer chains as well as simultaneous exfoliation of the BN platelets are fully characterized and show that these structural changes provide insight for understanding the property trends of the fibers. image

Exfoliation joint

Polypropylene

10.1002/mame.201500284

Cite

Citations (27)

Low-temperature graphitic formation promoted by confined interphase structures in polyacrylonitrile/carbon nanotube materials

Polymer (2018)

Navid Tajaddod Heng Li Marilyn L. Minus

Polyacrylonitrile

Interphase

10.1016/j.polymer.2018.01.007

Cite

Citations (15)

Low temperature graphitization of interphase polyacrylonitrile (PAN)

Carbon (2015)

Yiying Zhang Navid Tajaddod Kenan Song Marilyn L. Minus

Polyacrylonitrile

Interphase

Carbon fibers

10.1016/j.carbon.2015.04.088

Cite

Citations (67)

Application of the Electron Density Correlation Function for Structural Analysis of X-ray Scattering/Diffraction Information from Polymer-based Nano-Composites

MRS Proceedings (2015)

Kenan Song Yiying Zhang Navid Tajaddod Marilyn L. Minus

10.1557/opl.2015.760

Cite

Citations (4)

Interfacial crystallization of isotactic polypropylene surrounding macroscopic carbon nanotube and graphene fibers

Polymer (2016)

John P. Abdou Karina J. Reynolds Michaela R. Pfau Justin van Staden Gregory A. Braggin

Tacticity

10.1016/j.polymer.2016.03.055

Cite

Citations (60)

Improving multi functional properties in polymer based nano composites by interfacial enhancement

Navid Tajaddod

Polymer nanocomposites (PNCs) have become an area of increasing interest for study in the field of polymer science and technology since the rise of nanotechnology research. Despite the significant amount of progress being made towards producing high quality PNC materials, improvement in the mechanical, electrical, thermal and other functional properties still remain a challenge. To date, these properties are only a fraction of the expected theoretical values predicted for these materials. Development of interfacial regions between the filler and matrix within the composite has been found to be an important focus in terms of processing. Proper interfacial control and development may ensure excellent interaction and property transfer between the filler and polymer matrix in addition to improvement of multi-functional properties of PNCs. The property-structure importance for the existence of the interfacial and interphase region within PNCs is discussed in this thesis work. Two specific PNC systems are selected for study as part of this dissertation in order to understand the effect of interfacial region development on influencing multi-functional property trends. Polyethylene (PE)/boron nitride (BN) and polyacrylonitrile (PAN)/carbon nanotube (CNT) composites were selected to investigate their mechanical performance and thermal and electrical conductivity properties, respectively. For these systems it was found that the interfacial region structure is directly related to the enhancement of the subsequent multi-functional properties.

Polyacrylonitrile

Polymer nanocomposite

Filler (materials)

10.17760/d20255890

Cite

Citations (0)

Understanding the effect of filler size in ultra-high molecular weight polyethylene composites with nano- and micron-size boron nitride

HAL (Le Centre pour la Communication Scientifique Directe) (2013)

Navid Tajaddod Marilyn L. Minus

Filler (materials)

Ultra-high-molecular-weight polyethylene

Source

Cite

Citations (0)