TPU NANOCOMPOSITES WITH 1D AND 2D CARBONEOUS FILLERS

TPU NANOCOMPOSITES WITH 1D AND 2D CARBONEOUS FILLERS

Bibliographic Details
Main Author: Yuan, Dian
Language:English
Published: Case Western Reserve University School of Graduate Studies / OhioLINK 2015
Subjects:
Polymers
Thermoplastic polyurethane
Graphene
Carbon nanotubes
Hybrid
Mechanical properties
Viscoelastic behavior
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=case1427896892
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-case14278968922021-08-03T06:29:33Z TPU NANOCOMPOSITES WITH 1D AND 2D CARBONEOUS FILLERS Yuan, Dian Polymers Thermoplastic polyurethane Graphene Carbon nanotubes Hybrid Mechanical properties Viscoelastic behavior In this work thermoplastic polyurethane (TPUs) nanocomposites incorporating carbon nanotubes (CNTs) were prepared via melt blending and compression molding and their physical and mechanical properties were characterized. TPU-CNTs systems exhibited extensive filler agglomeration, which resulted in a significant decrease in strength and ductility. Since shear mixing was not effective enough to disentangle CNTs, surfactant was combined with the CNTs via sonication. TPU-CNT surfactant nanocomposites exhibited significantly higher tensile mechanical and dynamic mechanical properties comparing with nanocomposites prepared without surfactant, thanks to the better filler dispersion, as indicated by scanning electron microscopy (SEM) morphological studies. Thermogravimetric analyses (TGA) shed some light on a second mechanism of improvement in the mechanical properties: the well-dispersed nanofillers can also favor higher phase separation in TPUs, leading to a better microstructure which is able to enhance the load transfer effects and maximize the mechanical properties of the material. Synergistic effects were observed when 1D CNTs were combined with 2D graphene nanoplatelets in TPU hybrid composites. Higher tensile mechanical and dynamic mechanical properties were observed with respect to the systems incorporating individual CNT and graphene, especially when combining graphene and CNTs at a ratio of 6:4. The synergistic mechanism was hypothesized to occur due to the combination of two fillers with different shape and aspect ratio, with the long tortuous CNTs limiting graphene aggregation and bridging adjacent graphene platelets in order to form a more efficient network. Hybrid (6:4) nanocomposites showed the highest creep resistance and recovery ability since the network formed by 1D CNT and 2D graphene can hinder the movement of TPU chains, leading to a decrease in viscoelastic and viscous deformation.The TPUs developed in this study exhibit remarkably improved tensile and viscoelastic properties, which are highly demanded for this type of TPUs. Additional multifunctional properties can be potentially displayed, including electrical and thermal conductivity, self-healing mechanisms and shape-memory form effects, in order to extend the TPU use to many other technological applications. 2015-06-03 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1427896892 http://rave.ohiolink.edu/etdc/view?acc_num=case1427896892 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection NDLTD
language English
sources NDLTD
topic Polymers
Thermoplastic polyurethane
Graphene
Carbon nanotubes
Hybrid
Mechanical properties
Viscoelastic behavior
spellingShingle Polymers
Thermoplastic polyurethane
Graphene
Carbon nanotubes
Hybrid
Mechanical properties
Viscoelastic behavior
Yuan, Dian
TPU NANOCOMPOSITES WITH 1D AND 2D CARBONEOUS FILLERS
author Yuan, Dian
author_facet Yuan, Dian
author_sort Yuan, Dian
title TPU NANOCOMPOSITES WITH 1D AND 2D CARBONEOUS FILLERS
title_short TPU NANOCOMPOSITES WITH 1D AND 2D CARBONEOUS FILLERS
title_full TPU NANOCOMPOSITES WITH 1D AND 2D CARBONEOUS FILLERS
title_fullStr TPU NANOCOMPOSITES WITH 1D AND 2D CARBONEOUS FILLERS
title_full_unstemmed TPU NANOCOMPOSITES WITH 1D AND 2D CARBONEOUS FILLERS
title_sort tpu nanocomposites with 1d and 2d carboneous fillers
publisher Case Western Reserve University School of Graduate Studies / OhioLINK
publishDate 2015
url http://rave.ohiolink.edu/etdc/view?acc_num=case1427896892
work_keys_str_mv AT yuandian tpunanocompositeswith1dand2dcarboneousfillers
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