Characterization of deformation induced changes to conductivity in an electrically triggered shape memory polymer

Rogers, Nathaniel; Khan, Fazeel

doi:10.1016/j.polymertesting.2012.10.001

Cited by 22 publications

(18 citation statements)

References 27 publications

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“…We also tested the volume resistivity and conductivity of the composites. The results showed that the volume resistivity of composites decreased dramatically with the addition of CNTs, which changed from 7.10 × 10 15 to 6.60 × 10 . The conductivity of the composites with CNTs was indeed higher than that without CNTs.…”

Section: Resultsmentioning

confidence: 95%

“…Shape memory polymers (SMPs) are stimuli‐responsive materials that can change their shape from a temporary shape to a permanent shape under the appropriate stimulus, such as changes in pH, light, temperature, or the magnetic or electric field . As important smart materials, SMPs have received considerable attention in academic research and industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…KEYWORDS carbon nanotubes, low-density polyethylene, reinforce, shape memory, trans-1,4-polyisoprene 1 | INTRODUCTION Shape memory polymers (SMPs) are stimuli-responsive materials that can change their shape from a temporary shape to a permanent shape under the appropriate stimulus, 1 such as changes in pH, light, temperature, or the magnetic or electric field. [2][3][4][5][6][7][8][9] As important smart materials, SMPs have received considerable attention in academic research and industrial applications. SMPs have many merits over conventional shape memory alloys and ceramics, [10][11][12] such as easy processing, structural versatility, large shape deformability, and low manufacturing cost, 13,14 which has expanded their applications in self-healing, [15][16][17][18] intelligent textiles, 19 deployable aerospace structures, and biomedical treatments.…”

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confidence: 99%

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Shape memory behavior of carbon nanotube‐reinforced trans‐1,4‐polyisoprene and low‐density polyethylene composites

Xia

Gui-xue

2019

Polymers for Advanced Techs

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Shape memory composites of trans‐1,4‐polyisoprene (TPI) and low‐density polyethylene (LDPE) with easily achievable transition temperatures were prepared by a simple physical blending method. Carbon nanotubes (CNTs) were introduced to improve the mechanical properties of the TPI/LDPE composites. The mechanical, cure, thermal, and shape memory properties of the TPI/LDPE/CNTs composites were investigated in this study. In these composites, the cross‐linked network generated in both the TPI and LDPE portions acted as a fixed domain, while the crystalline regions of the TPI and LDPE portions acted as a domain of reversible shape memory behavior. We found that CNTs acted as not only reinforced fillers but also nucleation agents, which improved the crystalline degree of the TPI and LDPE portions of the composites. Compared with the properties at the other CNT doses, the mechanical properties of the TPI/LDPE composites when the CNT dose was 1 phr were improved significantly, showing excellent shape memory properties (Rf = 97.85%, Rr = 95.70%).

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Shape memory behavior of carbon nanotube‐reinforced trans‐1,4‐polyisoprene and low‐density polyethylene composites

Xia

Gui-xue

2019

Polymers for Advanced Techs

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“…Shape memory polymers (SMP) have been the subject of considerable research in the past decades [2][3][4], belonging to a class of smart materials that change their shape when exposed to an external stimulus, which can be UV light [5], temperature, solvent [6], magnetic field, or electricity [7]. Their high strain recovery behavior and low cost [8] made them ideal candidates for applications as varied as biomedical devices.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the papers focused on the preparation of novel functional materials, while direct heating is still the common method for triggering shape recovery [7]. Inspired by the idea above, in this article, we will focus on the preparation of a novel functional PCL based materials using Heptaphenyltricycloheptasiloxane Trihydroxy Silanol (T7-OH) as crosslinkers (Scheme 1), to enhance the thermal as well as mechanical properties and analyze the relationship between structure and properties of the materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of POSS-crosslinked PCL based hybrid materials

Yin

Zhang

2016

J Polym Res

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PCL based hybrid films exhibiting heat-responsive shape memory properties had been obtained by using Heptaphenyltricycloheptasiloxane Trihydroxy Silanol (T7-OH) as a cross-linker. The crystallization behaviors of the materials were studied in detail by DSC and XRD. The thermal properties of the materials were detected through TGA. The static mechanical properties, in vitro degradation and shape memory properties were also studied systematically. There was no remarkable T7-OH crystal plane diffraction peak according to XRD which indicated that T7-OH was well dispersed in the matrix. Meanwhile, according to the TGA, thermal degradation temperatures were increased significantly when T7-OH were added. It was worth noting that the materials possessed excellent shape memory properties with R f > 97 % and R r > 97 %.

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Electrothermally‐Driven Elongating‐Contracting Film Actuators Based on Two‐Way Shape Memory Carbon Nanotube/Ethylene‐Vinyl Acetate Composites

et al. 2021

Adv Materials Technologies

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Electrothermally‐driven shape‐memory composites (EDSMCs) are promising candidates in the field of actuators; however, they are still unable to deliver both substantial stretching strain and precise strain control, which limits their potential applications. A carbon nanotube (CNT) EDSMC composite made from ethylene‐vinyl acetate (EVA) is fabricated in this study using a novel hot‐pressing and xylene‐aided ultrasonic adsorption two‐step procedure to overcome this problem. Because of the outstanding electrical response of the CNT/EVA EDSMC, even at 50% tensile strain, it can accomplish electrothermally‐driven melting‐induced contraction (an extraordinary working limit for shape memory polymers‐based actuators). A large reversible strain and precise strain control can be integrated simultaneously with crystallization‐induced elongation at different cooling time. In addition, programmable actuation behaviors are made possible by the CNT/EVA EDSMC, which can generate predictable and diverse strain changes. Furthermore, the lightweight CNT/EVA EDSMC demonstrates good load capacity and can lift an object to 1000 times its weight. The CNT/EVA EDSMC shows durable performance under repeated elongation and contraction cycles tests over 100 times, without significant reduction of the strain precision, and had broad prospects for both engineering devices and robotics.

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Characterization of deformation induced changes to conductivity in an electrically triggered shape memory polymer

Cited by 22 publications

References 27 publications

Shape memory behavior of carbon nanotube‐reinforced trans‐1,4‐polyisoprene and low‐density polyethylene composites

Shape memory behavior of carbon nanotube‐reinforced trans‐1,4‐polyisoprene and low‐density polyethylene composites

Preparation and characterization of POSS-crosslinked PCL based hybrid materials

Electrothermally‐Driven Elongating‐Contracting Film Actuators Based on Two‐Way Shape Memory Carbon Nanotube/Ethylene‐Vinyl Acetate Composites

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