Microscopic mechanism of reinforcement and conductivity in polymer nanocomposite materials

Microscopic mechanism of reinforcement and conductivity in polymer nanocomposite materials

Bibliographic Details
Main Author: Chang, Tae-Eun
Language:English
Published: University of Akron / OhioLINK 2007
Subjects:
SWNT
nanotubes
Raman
composites
annealed SWNT
CNT
PS
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=akron1176746415
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-akron11767464152021-08-03T05:25:17Z Microscopic mechanism of reinforcement and conductivity in polymer nanocomposite materials Chang, Tae-Eun SWNT nanotubes Raman composites annealed SWNT CNT PS Modification of polymers by adding various nano-particles is an important method to obtain effective enhancement of materials properties. Within this class of materials, carbon nanotubes (CNT) are among the most studied materials for polymer reinforcement due to their extraordinary mechanical properties, superior thermal and electronic properties, and high aspect ratio. However, to unlock the potential of CNTs for applications, CNTs must be well dispersed in a polymer matrix and the microscopic mechanism of polymer reinforcement by CNTs must be understood. In this study, single-wall carbon nanotube (SWNT) composites with polypropylene (PP)-SWNT and polystyrene (PS)-SWNT were prepared and analyzed. Microscopic study of the mechanism of reinforcement and conductivity by SWNT included Raman spectroscopy, wide-angle X-ray diffraction (WAXD) and dielectric measurement. For PP-SWNT composites, tensile tests show a three times increase in the Young’s modulus with addition of only 1 wt% SWNT, and much diminished increase of modulus with further increase in SWNT concentration. For PS-SWNT composites, well-dispersed SWNT/PS composite has been produced, using initial annealing of SWNT and optimum sonication conditions. The studies on the tangential mode in the Raman spectra and TEM indicated well-dispersed SWNTs in a PS matrix. We show that conductivity appears in composites already at very low concentrations, hinting at the formation of a ‘percolative’ network even below 0.5% of SWNT. The Raman studies for both composites show good transfer of the applied stress from the polymer matrices to SWNTs. However, no significant improvement of mechanical property is observed for PS-SWNT composites. The reason for only a slight increase of mechanical property remains unknown. 2007-10-02 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1176746415 http://rave.ohiolink.edu/etdc/view?acc_num=akron1176746415 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic SWNT
nanotubes
Raman
composites
annealed SWNT
CNT
PS
spellingShingle SWNT
nanotubes
Raman
composites
annealed SWNT
CNT
PS
Chang, Tae-Eun
Microscopic mechanism of reinforcement and conductivity in polymer nanocomposite materials
author Chang, Tae-Eun
author_facet Chang, Tae-Eun
author_sort Chang, Tae-Eun
title Microscopic mechanism of reinforcement and conductivity in polymer nanocomposite materials
title_short Microscopic mechanism of reinforcement and conductivity in polymer nanocomposite materials
title_full Microscopic mechanism of reinforcement and conductivity in polymer nanocomposite materials
title_fullStr Microscopic mechanism of reinforcement and conductivity in polymer nanocomposite materials
title_full_unstemmed Microscopic mechanism of reinforcement and conductivity in polymer nanocomposite materials
title_sort microscopic mechanism of reinforcement and conductivity in polymer nanocomposite materials
publisher University of Akron / OhioLINK
publishDate 2007
url http://rave.ohiolink.edu/etdc/view?acc_num=akron1176746415
work_keys_str_mv AT changtaeeun microscopicmechanismofreinforcementandconductivityinpolymernanocompositematerials
_version_ 1719419599856861184

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