A hygro-thermo-mechanical constitutive model for shape memory polymers filled with nano-carbon powder

Gu, Jianping; Zhang, Xiaopeng; Duan, Hao; Wan, Mengqi; Sun, Huiyu

doi:10.1080/19475411.2021.1958089

Cited by 19 publications

(6 citation statements)

References 39 publications

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“…where Z is the parameter that indicates the width of the glass transition zone, and θ m is the reference temperature during glass transition. Note that the majority of the constitutive model developed in this paper and that in Gu et al (2021) is similar. Therefore, the values of relevant parameters can be directly adopted from Gu et al (2021), due to the reason that the same SMPC is studied in this paper.…”

Section: Resultsmentioning

confidence: 95%

“…Therefore, the values of relevant parameters can be directly adopted from Gu et al (2021), due to the reason that the same SMPC is studied in this paper. With reference to Gu et al (2021), all the relevant parameters are listed in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…In the last step, the shape recovery can be triggered by temperature, moisture, and electrical current. In Gu et al (2021), a similar constitutive model was developed to predict the thermally induced and moisture-induced SMEs of these SMPCs. In nature, the thermally, moisture, and electrically induced SMEs share the same driving mechanism.…”

Section: Model Verificationmentioning

confidence: 99%

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Electro-thermo-mechanical modeling of shape memory polymers filled with nano-carbon powder

Zhao

Duan

et al. 2021

Journal of Intelligent Material Systems and Structures

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Generally, adding the electroconductive fillers into the polymer matrix is a popular approach to endow the shape memory polymers (SMPs) with electroconductivity. Therefore, the shape memory effects (SMEs) of thermally induced SMPs can also be triggered by the electrical current. In essence, both the thermally activated and electrically activated SMEs share the same driving mechanism without considering the effect of heat conduction. In the paper, the constitutive model for the thermally induced SMPs filled with nano-carbon powder is briefly introduced. Then, a modified model is developed to characterize the effects of filler, deformation, and moisture on the electrical conductivity for the first time. After developing the correlation of electric field with Joule heat, the simulation is executed to display the free recovery of the shape memory polymer composites (SMPCs) with different filler content. It is found that the recovery ratio decreases with the increase of carbon powders for the SMPCs with filler content above the percolation threshold. Besides, a good recovery ratio can also be achieved through the application of a lower voltage.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Model Verificationmentioning

confidence: 99%

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Electro-thermo-mechanical modeling of shape memory polymers filled with nano-carbon powder

Zhao

Duan

et al. 2021

Journal of Intelligent Material Systems and Structures

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“…Gu et al [21] also proposed a hygro-thermo-mechanical finite deformation constitutive model incorporated with structural relaxation and moisture diffusion. They further developed a hygro-thermo-mechanical constitutive model for the SMPs by incorporating the variable moisture into the framework of a thermo-mechanical model [22]. Hsu et al [23] developed a thermo-hygro-mechanical model to obtain overall moisture distribution, hygroscopic induced strains and stress in multiphase materials.…”

Section: Introductionmentioning

confidence: 99%

A bridging model of a water-triggered shape-memory effect in an amorphous polymer undergoing multiple glass transitions

Shi

2023

J. Phys. D: Appl. Phys.

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Hydrothermally-driven shape memory polymers (SMPs) have been extensively studied due to their advantages of multiple response capabilities. In these SMPs, the bound water reduces their glass transition temperatures (Tg) by plasticizing the soft segments to achieve water-triggered shape-memory effect (SME). However, effect of bound water on hard segments, which has a synergistic effect on the Tg and water-triggered SME of the soft ones, is remained largely unexplored. In this study, we proposed a new model to explore working principles and hydrothermally-driven shape memory behaviors of the amorphous SMPs. The bound water molecules are firstly divided into the bridge and non-bridge ones, and then have a bridging effect is proposed to convert hard segments into soft ones, thus affecting the Tg and water-triggered shape memory behavior in SMPs. An extended Gordon-Taylor model is formulated to identify effects of bound water weight fraction and Tg. Furthermore, a constitutive relationship between strain and relaxation time has been developed to describe effects of temperature and bound water weight fraction on the hydrothermally-driven shape memory behaviors. Finally, effectiveness of the proposed models is verified using the experimental results of amorphous SMPs reported in literature.

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“…[14] Compared to traditional materials used in medical technology, shape memory polymer (SMP) and shape memory polymer composite (SMPC) have unique functional properties such as self-recovery performance and self-adaptation ability, etc. [15][16][17][18][19][20] It plays an important role in meeting the requirements of special properties of materials for new surgical and medical instruments. [6,14,16] SMP-based medical devices have the characteristics of low cost and excellent biocompatibility, which have great application prospects in the biomedical field.…”

Section: Introductionmentioning

confidence: 99%

Research Progress of Shape Memory Polymer and 4D Printing in Biomedical Application

Zhao

Yue

Liu

et al. 2022

Adv Healthcare Materials

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As a kind of smart material, shape memory polymer (SMP) shows great application potential in the biomedical field. Compared with traditional metal-based medical devices, SMP-based devices have the following characteristics: 1) The adaptive ability allows the biomedical device to better match the surrounding tissue after being implanted into the body by minimally invasive implantation; 2) it has better biocompatibility and adjustable biodegradability; 3) mechanical properties can be regulated in a large range to better match with the surrounding tissue. 4D printing technology is a comprehensive technology based on smart materials and 3D printing, which has great application value in the biomedical field. 4D printing technology breaks through the technical bottleneck of personalized customization and provides a new opportunity for the further development of the biomedical field. This paper summarizes the application of SMP and 4D printing technology in the field of bone tissue scaffolds, tracheal scaffolds, and drug release, etc. Moreover, this paper analyzes the existing problems and prospects, hoping to provide a preliminary discussion and useful reference for the application of SMP in biomedical engineering.

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A hygro-thermo-mechanical constitutive model for shape memory polymers filled with nano-carbon powder

Cited by 19 publications

References 39 publications

Electro-thermo-mechanical modeling of shape memory polymers filled with nano-carbon powder

Electro-thermo-mechanical modeling of shape memory polymers filled with nano-carbon powder

A bridging model of a water-triggered shape-memory effect in an amorphous polymer undergoing multiple glass transitions

Research Progress of Shape Memory Polymer and 4D Printing in Biomedical Application

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