Improved recovery stress in multi-walled-carbon-nanotubes reinforced polyurethane

Hashmi, S. A. R.; Prasad, Harish Chandra; Abishera, R.; Bhargaw, Hari Narayan; Naik, Ajay

doi:10.1016/j.matdes.2014.10.062

Cited by 44 publications

(34 citation statements)

References 28 publications

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“…There are two broad approaches to this issue as follows: polymer blending and using fillers. Previous studies show that the presence of only a small amount of carbon nanotubes (CNT) or graphene in a polymer matrix can significantly improve its mechanical properties and recovery stress . The uniform dispersion of CNTs in a matrix is a key factor that directly affects the mechanical properties of the nanocomposite.…”

Section: Introductionmentioning

confidence: 99%

Shape memory and mechanical properties of TPU/ABS blends: The role of pristine versus organo‐modified carbon nanotubes

et al. 2017

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Some shape‐memory materials were prepared based on TPU/ABS blends containing pristine and organo‐modified multiwalled carbon nanotubes (MWCNTs). The shape memory and mechanical properties of the samples were investigated. Scanning electron microscopy (SEM) analysis performed on the morphological features of the developed samples showed the presence of pristine MWCNTs and decreased diameter of ABS droplets which were uniformly distributed within TPU matrix. Unexpectedly, the ABS droplets in nanocomposites with organo‐modified MWCNTs were greater than ABS droplets in TPU/ABS/CNT nanocomposites. These differences were attributed to different degrees in interfacial interactions between the modified MWCNT and TPU matrix. The presence of modified MWCNT in TPU matrix could have increased the differences in surface energy and polarity of TPU and ABS and it has disturbed the compatibility of the blend fundamentally. Also, the mechanical and Izod impact properties of the shape memory samples containing pristine MWCNT are better than those samples containing MWCNT‐OH and MWCNT‐COOH. The results showed optimum tensile strength in all samples containing 2 wt% MWCNTs. The shape memory results showed that the shape recovery and fixity of TPU/ABS blend improved significantly with increases in MWCNTs. The pristine MWCNTs improved the shape recovery ratio from 93.88% for the neat TPU/ABS blend to 99.3% for TPU/ABS nanocomposite by just loading MWCNTs at 2 wt%. Surprisingly, the shape fixity changed from 92.98% for the neat blend to 100% by loading of 2 wt% of MWCNT‐OH and 1 wt% of MWCNT‐COOH. The results showed that the functionalized MWCNTs had better performance in shape fixity as compared to its pristine MWCNT counterpart. POLYM. COMPOS., 39:E984–E995, 2018. © 2017 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Shape memory and mechanical properties of TPU/ABS blends: The role of pristine versus organo‐modified carbon nanotubes

et al. 2017

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“…14 The strong band in the low wavenumber region around 600-500 cm À1 is due to characteristic Ce-O vibrations. 14 The strong band in the low wavenumber region around 600-500 cm À1 is due to characteristic Ce-O vibrations.…”

Section: Structural Characterizationmentioning

confidence: 99%

A promising nanocomposite from CNTs and nano-ceria: nanostructured fillers in polyurethane coatings for surface protection

2015

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The balanced combination of nanostructured carbon materials and metal oxide nanoparticles has been considered as an efficient reinforcement material in developing next-generation multifunctional coatings. Herein, we demonstrate a general approach to fabricate a CNT based nanocomposite with the inclusion of CeO 2 nanoparticles that can be effectively implemented as a reinforcement material in surface protective coatings. The synthesized CNT/CeO 2 nanocomposite was characterized by spectral and surface morphological analyses, which indicated that the CeO 2 nanoparticles were successfully deposited onto the surface of the CNTs. The XRD pattern shows the semi-crystalline nature of the CNTs and the face centered cubic structure of the CeO 2 nanoparticles. The prepared nanocomposite has subsequently been used as a nanofiller in polyurethane (PU) coatings for surface protection of steel substrates and a remarkable synergistic effect of nano-ceria and CNTs has been observed. The corrosion resistance of steel coated with a PU coating containing CNT/CeO 2 was pointedly higher than with a pure PU coating and a PU coating with CNTs alone. This result suggests a new prospect for solving the corrosion issues encountered on steel structures in industrial applications by using multifunctional hybrid coatings with nanostructured reinforcements. Fig. 1 (a) IR and (b) UV-vis absorbance curves of f-CNTs, synthesized CeO 2 nanoparticles and the CNT/CeO 2 nanocomposite.This journal is

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“…Shape memory material as a broad category of smart materials is receiving increasing attention due to their great scientific and technological significance . These stimuli‐responsive materials can hold a temporary shape before an exposure to an appropriate external stimulus; after that, their original permanent shape is retrieved .…”

Section: Introductionmentioning

confidence: 99%

“…It converts to a limiting parameter in some applications especially when the material must dominate a high resisting stress during shape recovery. Some solutions have been suggested here such as increasing the crosslinking density, incorporation of inorganic fillers to polymer matrix, changing polymer chemistry, or optimizing conditions of deformation which cause SMPs elastic modulus and therefore recovery stress to be enhanced . The most common method is to introduce inorganic fillers, especially nanoparticles with high elastic modulus to SMPs.…”

Section: Introductionmentioning

confidence: 99%

Experimental and modeling investigation of shape memory behavior of polyurethane/carbon nanotube nanocomposite

Moghim

Zebarjad

Eqra

2018

Polymers for Advanced Techs

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In the current study, mechanical, thermal, thermo‐mechanical, and shape memory behavior of polyurethane/carbon nanotube nanocomposites were investigated, and also a modified Halpin‐Tsai equation was used for the first time to model shape recovery stress of these smart composites. Results showed that strength enhanced with the addition of MWCNTs and improved to a maximum value of 130% for PU‐1wt%CNTs. SEM micrographs were also used to prove the presence of agglomerates at higher CNT contents. By investigating thermogravimetry curves, it was concluded that the incorporation of carbon nanotubes transferred thermal degradation to a higher temperature. Storage modulus improved for nanocomposite samples which showed the reinforcing effect of CNTs on polyurethane. Memory behavior showed that recovery stress was increased for PU‐CNTs samples to a maximum value of 100% and not any harmful effect on shape recoveries observed. Finally, modified Halpin‐Tsai equation was obtained with the correction factor of K = exp(−1.79‐152Vf).

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Improved recovery stress in multi-walled-carbon-nanotubes reinforced polyurethane

Cited by 44 publications

References 28 publications

Shape memory and mechanical properties of TPU/ABS blends: The role of pristine versus organo‐modified carbon nanotubes

Shape memory and mechanical properties of TPU/ABS blends: The role of pristine versus organo‐modified carbon nanotubes

A promising nanocomposite from CNTs and nano-ceria: nanostructured fillers in polyurethane coatings for surface protection

Experimental and modeling investigation of shape memory behavior of polyurethane/carbon nanotube nanocomposite

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