PVA/PEG/graphene shape memory composites responsive to multi-stimuli

Fahad H. Falqi; Osamah A. Bin-Dahman; Ahmed Khair; Mamdouh A. Al-Harthi

doi:10.1007/s00339-022-05484-2

PVA/PEG/graphene shape memory composites responsive to multi-stimuli

Fahad H. Falqi
, Osamah A. Bin-Dahman
, Ahmed Khair
, Mamdouh A. Al-Harthi^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Commercially available low-cost polyvinyl alcohol (PVA)/polyethylene glycol (PEG) were used to develop nanocomposites containing different amounts of graphene using the solution casting technique. The shape-memory performance of the developed films was investigated using multiple types of actuations, including thermal heating and microwave (MW) irradiation for triggering the shape-memory effects (SMEs). The bending test was used to quantitatively characterize SMEs of PVA/PEG nanocomposites. The results show that the developed PVA/PEG blend and its nanocomposites show shape recoverability under both thermal and MW irradiation actuation. The nanocomposite containing 0.2 wt% graphene exhibits the best shape-memory performance. The maximal recovery ratio (R_r) is nearly 100% within 8 s. However, for the specimens with higher graphene loadings of 0.5 and 1.0 wt%, the R_r values are significantly lower with incomplete recovery (R_r ≈ 45%). The scanning electron microscopy (SEM) image of PVA/PEG/0.2 shows good uniformity and dispersion of graphene, while at higher loadings graphene sheets agglomerate. The nanocomposites also show positive results when subjected to water-induced shape recovery tests. The recovery data were fit using a sigmoidal-logistic-1 model with correlation factors of 0.999. Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis were used to evaluate the SMEs. The nanocomposites show improved thermal stability compared to that of the blend without graphene as indicated by the increase (by 10–30 °C) in the values of the degradation temperature. This study identified novel and flexible graphene-based SMP materials with a potential for a range of applications, such as actuations, tissue regeneration, wearable sensors, and thermal management The highlight of this study is using graphene to introduce additional cross-linked points in PVA/PEG composites to improve the shape memory properties under multiple types of actuations.

Original language	English
Article number	427
Journal	Applied Physics A: Materials Science and Processing
Volume	128
Issue number	5
DOIs	https://doi.org/10.1007/s00339-022-05484-2
State	Published - May 2022

Bibliographical note

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.

Keywords

Microwave
Recovery process
Shape recovery ratio
Shape-memory polymers

ASJC Scopus subject areas

General Chemistry
General Materials Science

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10.1007/s00339-022-05484-2

Cite this

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title = "PVA/PEG/graphene shape memory composites responsive to multi-stimuli",

abstract = "Commercially available low-cost polyvinyl alcohol (PVA)/polyethylene glycol (PEG) were used to develop nanocomposites containing different amounts of graphene using the solution casting technique. The shape-memory performance of the developed films was investigated using multiple types of actuations, including thermal heating and microwave (MW) irradiation for triggering the shape-memory effects (SMEs). The bending test was used to quantitatively characterize SMEs of PVA/PEG nanocomposites. The results show that the developed PVA/PEG blend and its nanocomposites show shape recoverability under both thermal and MW irradiation actuation. The nanocomposite containing 0.2 wt\% graphene exhibits the best shape-memory performance. The maximal recovery ratio (Rr) is nearly 100\% within 8 s. However, for the specimens with higher graphene loadings of 0.5 and 1.0 wt\%, the Rr values are significantly lower with incomplete recovery (Rr ≈ 45\%). The scanning electron microscopy (SEM) image of PVA/PEG/0.2 shows good uniformity and dispersion of graphene, while at higher loadings graphene sheets agglomerate. The nanocomposites also show positive results when subjected to water-induced shape recovery tests. The recovery data were fit using a sigmoidal-logistic-1 model with correlation factors of 0.999. Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis were used to evaluate the SMEs. The nanocomposites show improved thermal stability compared to that of the blend without graphene as indicated by the increase (by 10–30 °C) in the values of the degradation temperature. This study identified novel and flexible graphene-based SMP materials with a potential for a range of applications, such as actuations, tissue regeneration, wearable sensors, and thermal management The highlight of this study is using graphene to introduce additional cross-linked points in PVA/PEG composites to improve the shape memory properties under multiple types of actuations.",

keywords = "Microwave, Recovery process, Shape recovery ratio, Shape-memory polymers",

author = "Falqi, \{Fahad H.\} and Bin-Dahman, \{Osamah A.\} and Ahmed Khair and Al-Harthi, \{Mamdouh A.\}",

note = "Publisher Copyright: {\textcopyright} 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.",

year = "2022",

month = may,

doi = "10.1007/s00339-022-05484-2",

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AU - Falqi, Fahad H.

AU - Bin-Dahman, Osamah A.

AU - Khair, Ahmed

AU - Al-Harthi, Mamdouh A.

PY - 2022/5

Y1 - 2022/5

N2 - Commercially available low-cost polyvinyl alcohol (PVA)/polyethylene glycol (PEG) were used to develop nanocomposites containing different amounts of graphene using the solution casting technique. The shape-memory performance of the developed films was investigated using multiple types of actuations, including thermal heating and microwave (MW) irradiation for triggering the shape-memory effects (SMEs). The bending test was used to quantitatively characterize SMEs of PVA/PEG nanocomposites. The results show that the developed PVA/PEG blend and its nanocomposites show shape recoverability under both thermal and MW irradiation actuation. The nanocomposite containing 0.2 wt% graphene exhibits the best shape-memory performance. The maximal recovery ratio (Rr) is nearly 100% within 8 s. However, for the specimens with higher graphene loadings of 0.5 and 1.0 wt%, the Rr values are significantly lower with incomplete recovery (Rr ≈ 45%). The scanning electron microscopy (SEM) image of PVA/PEG/0.2 shows good uniformity and dispersion of graphene, while at higher loadings graphene sheets agglomerate. The nanocomposites also show positive results when subjected to water-induced shape recovery tests. The recovery data were fit using a sigmoidal-logistic-1 model with correlation factors of 0.999. Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis were used to evaluate the SMEs. The nanocomposites show improved thermal stability compared to that of the blend without graphene as indicated by the increase (by 10–30 °C) in the values of the degradation temperature. This study identified novel and flexible graphene-based SMP materials with a potential for a range of applications, such as actuations, tissue regeneration, wearable sensors, and thermal management The highlight of this study is using graphene to introduce additional cross-linked points in PVA/PEG composites to improve the shape memory properties under multiple types of actuations.

AB - Commercially available low-cost polyvinyl alcohol (PVA)/polyethylene glycol (PEG) were used to develop nanocomposites containing different amounts of graphene using the solution casting technique. The shape-memory performance of the developed films was investigated using multiple types of actuations, including thermal heating and microwave (MW) irradiation for triggering the shape-memory effects (SMEs). The bending test was used to quantitatively characterize SMEs of PVA/PEG nanocomposites. The results show that the developed PVA/PEG blend and its nanocomposites show shape recoverability under both thermal and MW irradiation actuation. The nanocomposite containing 0.2 wt% graphene exhibits the best shape-memory performance. The maximal recovery ratio (Rr) is nearly 100% within 8 s. However, for the specimens with higher graphene loadings of 0.5 and 1.0 wt%, the Rr values are significantly lower with incomplete recovery (Rr ≈ 45%). The scanning electron microscopy (SEM) image of PVA/PEG/0.2 shows good uniformity and dispersion of graphene, while at higher loadings graphene sheets agglomerate. The nanocomposites also show positive results when subjected to water-induced shape recovery tests. The recovery data were fit using a sigmoidal-logistic-1 model with correlation factors of 0.999. Fourier transform infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis were used to evaluate the SMEs. The nanocomposites show improved thermal stability compared to that of the blend without graphene as indicated by the increase (by 10–30 °C) in the values of the degradation temperature. This study identified novel and flexible graphene-based SMP materials with a potential for a range of applications, such as actuations, tissue regeneration, wearable sensors, and thermal management The highlight of this study is using graphene to introduce additional cross-linked points in PVA/PEG composites to improve the shape memory properties under multiple types of actuations.

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KW - Recovery process

KW - Shape recovery ratio

KW - Shape-memory polymers

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DO - 10.1007/s00339-022-05484-2

M3 - Article

AN - SCOPUS:85128787711

SN - 0947-8396

VL - 128

JO - Applied Physics A: Materials Science and Processing

JF - Applied Physics A: Materials Science and Processing

IS - 5

M1 - 427

ER -

PVA/PEG/graphene shape memory composites responsive to multi-stimuli

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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