Preparation and laser sintering of a thermoplastic polyurethane carbon nanotube composite-based pressure sensor

Zhuang, Yu; Guo, Yanling; Li, Jian; Jiang, Kaiyi; Yu, Yueqiang; Zhang, Hui; Liu, Dakun

doi:10.1039/d0ra04479b

Cited by 34 publications

(21 citation statements)

References 28 publications

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“…60,61 For SLS 3D printing of polyurethane, the temperature of crystallization (T c ) and T g2 are the key parameters, and the temperature difference between T c and T g2 is usually defined as the sintering window. 62,63 For crystalline polymer, the sintering temperature should be higher than T c because the recrystallization behavior of the material during the cooling process after sintering will lead to the warping of the printed products and subsequently result in the stoppage of printing. On the other hand, the sintering temperature should be lower than T g2 ; otherwise, the movement of the molecular chain will cause the sticking and agglomeration of the powder, which affects the flow of the powder and the dimensional accuracy of the printed devices.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Selective Laser Sintering 4D Printing of Dynamic Cross-linked Polyurethane Containing Diels–Alder Bonds

Ouyang

et al. 2022

ACS Appl. Polym. Mater.

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Selective laser sintering (SLS) four-dimensional (4D) printing of smart materials remains a big challenge and largely unexplored due to the lack of suitable materials. Here, we developed one kind of polyurethane containing reversible Diels− Alder bond (PUDA) covalent adaptable network (CAN) with selfhealing and shape memory functions for SLS 4D printing. The dynamic mechanism of the Diels−Alder bonds was confirmed by 1 H NMR and in situ FTIR. Furthermore, the kg-scale PUDA materials as well as their carbon nanotube (CNT) composite powders were prepared by the freeze-grinding method. The SLS printed PUDA materials show nearly isotropic mechanical properties due to the improved interlayer interaction by dynamic cross-linking. The SLS printed PUDA/CNT composites possess NIR-triggered self-healing and shape memory functions. This study provides a paradigm for designing dynamic polymers/ composites for SLS 4D printing.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Selective Laser Sintering 4D Printing of Dynamic Cross-linked Polyurethane Containing Diels–Alder Bonds

Ouyang

et al. 2022

ACS Appl. Polym. Mater.

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“…To improve the conductivity of polyurethane, common electronic conductors of metals, 19 carbon-based materials, 20−23 2D materials, 24 and conductive polymers 25,26 have been introduced into the elastomer matrix. However, the darker conductive materials, for example, CNTs, 20,23 r-GO, 21 AgNWs, 19 and PPy, 26 limit its application in electronic and optical equipment. Worse still, the poor compatibility between such conductive matter and the polyurethane network is also a big problem, and it will lead to poor mechanical and electrical properties for the conductive compound.…”

Section: Introductionmentioning

confidence: 99%

A Novel Ionic Conductive Polyurethane Based on Deep Eutectic Solvent Continuing Traditional Merits

Cheng

Yang

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Artificial intelligence (AI) has become increasingly popular along with the development of the bionic neural system. Ionic conductors play an important role in the AI system due to the ability of bionic sensing and signal transporting. Traditional low-polarity elastomers possess outstanding mechanical strength and stability, such as polyurethane, which is difficult to be directly endowed with ionic conductivity without impairing its properties. Herein, we have first put forward a new approach to synthesize a liquid-free ionic conductive polyurethane (CPU) through one-step copolymerization between a green deep eutectic solvent (DES) and a prepolymer of polyurethane. The as-prepared CPU can retain the native properties of the traditional polyurethane (PU) such as the homogeneous phase, ease of molding, high transparency (about 93.3%), and excellent mechanical properties. By introducing the DES as the covalent cross-linking agent and ionic conductor at the same time, the CPU also has fine ionic conductivity (3.78 × 10–5 S cm–1), environmental resistance like anti-freezing (−20 °C), and solvent resistance. Based on the excellent conductivity and mechanical strength, the flexible CPU can be applied as a sensing element in pressure sensors. The CPU-based sensor has presented long-term stability, high sensitivity, and wide-ranging response (0.17–3.28 MPa) to the applied pressure, which will be suitable for the industrial demands for practical applications.

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“…Recently, novel resistive-type conductive polymer composite (CPC)-based strain sensors have attracted attention based on their merits of light weight, flexibility, stretchability, and easy processing, thus showing great potential applications in the fields of software robots [1], electronic skins [2], smart wearable devices [3], human movement detection [2,4,5], etc. Owing to the flexibility and stretchability of the polymer matrix, CPCs also have great potentials for the detection of various external stimuli (tensile, compression, organic vapor, temperature, etc.)…”

Section: Introductionmentioning

confidence: 99%

Study on the forming and sensing properties of laser-sintered TPU/CNT composites for plantar pressure sensors

Zhuang

Guo

et al. 2021

Int J Adv Manuf Technol

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Conductive polymer composites (CPCs) combining with specific microstructures (micropores, microcracks, etc.) can exhibit unique resistance response changes, which can be widely regarded as an effective way to improve sensing performance. This study takes advantage of the characteristics of the formation of tiny pores between crystal grains during selective laser sintering (SLS) processing to introduce a microporous structure into the thermoplastic polyurethane (TPU)/carbon nanotube (CNT) sensing element to prepare a three-dimensional porous conductive structure. The effect of the SLS process on sensing sensitivity, accuracy, and density was studied, and its sensing and forming mechanism were discussed. By adjusting SLS process parameters to control the performance of porous structure sensor elements, a final TPU/CNT sensor element with a wide pressure detection range, high sensitivity, a fast response time, and good stability and durability was developed. Finally, the optimal performance of the developed flexible pressure sensor was successfully used to detect the pressure distribution of the human foot. This study provided a simple and effective research method to develop high-performance flexible pressure sensors.

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Preparation and laser sintering of a thermoplastic polyurethane carbon nanotube composite-based pressure sensor

Abstract: Selective laser sintering (SLS) is a desirable method for fabricating human motion detecting sensors as it can produce a complex shape with different materials that are machinable to specific applications.

Cited by 34 publications

References 28 publications

Selective Laser Sintering 4D Printing of Dynamic Cross-linked Polyurethane Containing Diels–Alder Bonds

Selective Laser Sintering 4D Printing of Dynamic Cross-linked Polyurethane Containing Diels–Alder Bonds

A Novel Ionic Conductive Polyurethane Based on Deep Eutectic Solvent Continuing Traditional Merits

Study on the forming and sensing properties of laser-sintered TPU/CNT composites for plantar pressure sensors

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