Theses and Dissertations

Date of Award

12-2021

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Advisor

Dr. Karen Lozano

Second Advisor

Dr. Horacio Vasquez

Third Advisor

Dr. Rogelio Benitez

Abstract

This study focuses on the development and characterization of fiber-based polymer composite structures with the goal of developing high performance, flexible, lightweight, and cost-effective materials for electromagnetic interference shielding and piezoelectricity. Polyvinylidene fluoride (PVDF) was used as the base fiber mat while polyaniline (PANI), polypyrrole (PPY), polyindole (PIN), polydiacetylene (PDA) and Zn2GeO4 (ZGO) were incorporated via solution mixing and in-situ polymerization. The PVDF fine fiber systems were produced using the Forcespinning® method. Morphology, structure, thermal stability, electrical properties, EMI shielding effectiveness and piezoelectric performance of the fiber mats were analyzed. The composite system containing 1.25 wt. % of ZGO-PVDF displayed the highest piezoelectric response of 172V. This fine fiber composite system has promising potential applications for energy harvesting and the powering of wearable and portable electronics. The PVDF/PANI-PDA multilayered composite consisting 5 layers showed the highest obtained value more than 40dB EMI SE in the frequency range at 500 MHz.

Comments

Copyright 2021 Fariha Rubaiya. All Rights Reserved.

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