Preparation and characterization of waterborne polyurethane containing PET waste/PPG as soft segment

Fang, Changqing; Lei, Wanqing; Zhou, Xing; Yu, Qian; Cheng, Youliang

doi:10.1002/app.42757

Cited by 14 publications

(7 citation statements)

References 41 publications

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“…Figure a illustrates the X‐ray diffraction (XRD) patterns of TPUEM, TPUEM/CNTs, and TPUEM/CNTs/AgNPs from 5° to 90° (2θ). A main diffraction peak can be clearly observed at about 19.9° in XRD spectrum of pure TPUEM, which is consistent with reported literatures . The TPUEM/CNTs showed an additional sharp peak at 2θ = 26.1° along with weak peaks at around 43.2° and 44.6°, which attributed to the (002), (100), and (101) crystalline planes of CNTs .…”

Section: Resultssupporting

confidence: 90%

Highly Sensitive and Stretchable CNT‐Bridged AgNP Strain Sensor Based on TPU Electrospun Membrane for Human Motion Detection

Huang

Zhao

et al. 2019

Adv Elect Materials

113

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simplicity of design. [10,11] Several requirements such as high stretchability, flexibility, a wide working strain range from a subtle region to a large region, durability, lightweight, and low energy consumption should be fulfilled for wearable devices. [12] To achieve the stretchable flexible devices, studies on stretchable elastomeric substrates consisting of highly conductive fillers have been reported. [13,14] Ding et al. demonstrated a scalable and facile preparation of the electrospun polyurethane (PU) nonwoven dip-coated with the conducting polymer poly(3,4-ethylened ioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), which possessed adjustable electrical conductivity in the range of 30-200 S m −1 and large stretchability of 400%. [15] Lu et al. reported a sandwich-structured strain sensor with a gauge factor (GF) of 12.9 (at 20% strain) and a sensing range of 0-50% based on attaching the silver nanowires (AgNWs) on the thermoplastic polyurethane electrospun membrane (TPUEM) by filtration, followed by spin-coating using the liquid polydimethylsiloxane (PDMS). [16] Recently, electrospinning has become an effective, facile, and scalable technique for preparation of micro/nanofibers applied in wide applications. [17][18][19] The electrospun fibers own numerous advantages such as large specific surface area, high porosity, fine diameter, and commendable mechanical flexibility, which is an ideal base material for functional composites. [20,21] Especially, thermoplastic polyurethane (TPU) was easily electrospun into fibrous membrane which displayed outstanding stretchability, flexibility, and mechanical strength. [22,23] However, the pristine TPUEM has no conductivity and cannot be serving as sensing materials solely. Diverse conductive fillers incorporate into TPUEM to be developed as stretchable strain sensors. Yan et al. fabricated electrospun TPU fiber yarns successively decorated with multiwalled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) for wearable strain sensors. [24] Wang et al. developed a novel strain sensor with an excellent 3D conductive network based on reduced graphene oxide (RGO)-decorated TPU mats. [25] Tian fabricated electrospun PU/polyaniline nanofibrous mat by in situ chemical polymerization of aniline monomers on the surface of electrospun PU nanofiber substrate for wearable device. [26] However, it is quite difficult to Highly stretchable, conductive, and sensitive strain-sensing materials have aroused wide interest owing to their potential in wearable devices. A facile and scalable method to fabricate a carbon-nanotube-(CNT-) bridged silver nanoparticles (AgNPs) strain sensor based on thermoplastic polyurethane electrospun membrane (TPUEM), which exhibits a large strain range with a high gauge factor simultaneously, is demonstrated. It exhibits a high stretchability with large workable strain range of up to 550%, high gauge factor of 7066, good durability over 1000 cycles, and comparable stability under various strains. Importantly, it can be used for human mo...

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Section: Resultssupporting

confidence: 90%

Highly Sensitive and Stretchable CNT‐Bridged AgNP Strain Sensor Based on TPU Electrospun Membrane for Human Motion Detection

Huang

Zhao

et al. 2019

Adv Elect Materials

113

View full text Add to dashboard Cite

show abstract

“…Besides that, the diffraction peak at 2θ = 37.95°, 44.19°, 64.39°, and 77.24° corresponded to the characterized diffraction peaks of (111), (200), (220), and (311) for silver (JCPD NO. 99-0094), respectively [41][42][43][44]. The formation of an oxide film on the surface of silver by water molecules will reduce its conductivity and subsequently deteriorate the performance of the device.…”

Section: Morphology and Properties Of Tpu Enms And Agnw/tpu Enmsmentioning

confidence: 99%

Highly Sensitive, Breathable, and Flexible Pressure Sensor Based on Electrospun Membrane with Assistance of AgNW/TPU as Composite Dielectric Layer

Wang

Lou

Wang

et al. 2020

Sensors

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Pressure sensors have been widely used in electronic wearable devices and medical devices to detect tiny physical movements and mechanical deformation. However, it remains a challenge to fabricate desirable, comfortable wearing, and highly sensitive as well as fast responsive sensors to capture human body physiological signs. Here, a new capacitive flexible pressure sensor that is likely to solve this problem was constructed using thermoplastic polyurethane elastomer rubber (TPU) electrospinning nanofiber membranes as a stretchable substrate with the incorporation of silver nanowires (AgNWs) to build a composite dielectric layer. In addition, carbon nanotubes (CNTs) were painted on the TPU membranes as flexible electrodes by screen printing to maintain the flexibility and breathability of the sensors. The flexible pressure sensor could detect tiny body signs; fairly small physical presses and mechanical deformation based on the variation in capacitance due to the synergistic effects of microstructure and easily altered composite permittivity of AgNW/TPU composite dielectric layers. The resultant sensors exhibited high sensitivity (7.24 kPa−1 within the range of 9.0 × 10−3 ~ 0.98 kPa), low detection limit (9.24 Pa), and remarkable breathability as well as fast responsiveness (<55 ms). Moreover, both continuously pressing/releasing cycle over 1000 s and bending over 1000 times did not impair the sensitivity, stability, and durability of this flexible pressure sensor. This proposed strategy combining the elastomer nanofiber membrane and AgNW dopant demonstrates a cost-effective and scalable fabrication of capacitive pressure sensors as a promising application in electronic skins and wearable devices.

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“…As shown in Fig. B, two broad diffraction peaks, at about 2θ = 19.9° and 41.6°, respectively, could be observed in XRD pattern of all samples, which corresponds to the characteristic diffraction pattern soft segments of segmented PU , suggesting all samples are of amorphous structure and the introduction of MWCNTs does not change the crystallographic structure of the WPU matrix. No characteristic diffraction peak of MWMWCNTs was observed in PUC samples.…”

Section: Resultsmentioning

confidence: 75%

Dispersion of multiwalled carbon nanotubes in waterborne polyurethane emulsions derived from alcoholysis products of waste PET and its effect on properties

Fang

Yang

2018

Polymer Engineering & Sci

Self Cite

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Composite emulsions of waterborne polyurethane (WPU) with multiwalled carbon nanotube (MWCNTs) have been synthesized successfully. Waterborne polyurethane emulsions were synthesized from the alcoholysis products of waste poly(ethylene terephthalate) (PET). Carbon nanotubes were treated with concentrated acid, to have better compatibility in waterborne polyurethane. Thermal properties show that the introduction of carbon nanotubes enhances the thermal stability of WPU matrix. However, a further increment of the content of MWCNTs from 0.3 to 0.5% causes a reduction. When the content of MWCNTs increases from 0.5% to 2%, the thermal stability of waterborne polyurethane samples enhances, which is related to the steric hindrance effect of MWCNTs. The dispersion of MWCNTs is the best for waterborne polyurethane with 0.3% MWCNTs. X‐ray diffraction tests show the introduction of MWCNTs does not change the crystallographic structure of the WPU matrix. Visual examination, TEM images, and UV/Vis absorption spectrum prove that partial carbon nanotubes have been dispersed homogenously in the waterborne polyurethane matrix. The dispersion of MWCNTs is the worst for waterborne polyurethane sample with 2% MWCNTs in three samples. Water absorption tests show that carbon nanotubes can decrease the water absorption. POLYM. ENG. SCI., 58:2149–2155, 2018. © 2018 Society of Plastics Engineers

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Preparation and characterization of waterborne polyurethane containing PET waste/PPG as soft segment

Cited by 14 publications

References 41 publications

Highly Sensitive and Stretchable CNT‐Bridged AgNP Strain Sensor Based on TPU Electrospun Membrane for Human Motion Detection

Highly Sensitive and Stretchable CNT‐Bridged AgNP Strain Sensor Based on TPU Electrospun Membrane for Human Motion Detection

Highly Sensitive, Breathable, and Flexible Pressure Sensor Based on Electrospun Membrane with Assistance of AgNW/TPU as Composite Dielectric Layer

Dispersion of multiwalled carbon nanotubes in waterborne polyurethane emulsions derived from alcoholysis products of waste PET and its effect on properties

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