Preparation and characterization of metal-containing aromatic polyimides

Yang, Xin; Wang, Xin; Chen, Daoyong; Yang, Juan; Lu, Lude; X, Sun; He, Guangyu; Chen, Jing

doi:10.1002/1097-4628(20000912)77:11<2363::aid-app4>3.0.co;2-1

Cited by 12 publications

(8 citation statements)

References 9 publications

(5 reference statements)

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“…[47] Peak analysis of C=O groups was carried out to investigate the relative content of hydrogen bonds. [48] The stretching vibration region of C=O groups could be divided into three peaks: the stretching vibration region of free C=O groups located at 1720 cm −1 , the ordered hydrogen-bonded C=O groups at 1650 cm −1 , and the disordered hydrogen-bonded C=O groups at 1699 cm −1 (see Figure 4c and Figure S5, Supporting Information). [49,50] The percentage of the hydrogen bond content of WPU/UPy x% /Di-PE (100-x)% is listed in Table S3, Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Ultra‐Tough Waterborne Polyurethane‐Based Graft‐Copolymerized Piezoresistive Composite Designed for Rehabilitation Training Monitoring Pressure Sensors

Yang

et al. 2023

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Effective training is crucial for patients who need rehabilitation for achieving optimal recovery and reducing complications. Herein, a wireless rehabilitation training monitoring band with a highly sensitive pressure sensor is proposed and designed. It utilizes polyaniline@waterborne polyurethane (PANI@WPU) as a piezoresistive composite material, which is prepared via the in situ grafting polymerization of PANI on the WPU surface. WPU is designed and synthesized with tunable glass transition temperatures ranging from −60 to 0 °C. Dipentaerythritol (Di‐PE) and ureidopyrimidinone (UPy) groups are introduced, endowing the material with good tensile strength (14.2 MPa), toughness (62 MJ−1m−3), and great elasticity (low permanent deformation: 2%). Di‐PE and UPy enhance the mechanical properties of WPU by increasing the cross‐linking density and crystallinity. Combining the toughness of WPU and the high‐density microstructure derived by hot embossing technology, the pressure sensor exhibits high sensitivity (168.1 kPa−1), fast response time (32 ms), and excellent stability (10 000 cycles with 3.5% decay). In addition, the rehabilitation training monitoring band is equipped with a wireless Bluetooth module, which can be easily applied to monitor the rehabilitation training effect of patients using an applet. Therefore, this work has the potential to significantly broaden the application of WPU‐based pressure sensors for rehabilitation monitoring.

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Section: Resultsmentioning

confidence: 99%

Ultra‐Tough Waterborne Polyurethane‐Based Graft‐Copolymerized Piezoresistive Composite Designed for Rehabilitation Training Monitoring Pressure Sensors

Yang

et al. 2023

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“…The intrinsic viscosity of the PET resins used in the present study was 0.6 d L/g and PET/SiO 2 (SiO 2 : 4 wt %) composites were prepared using in situ polymerization, which was described elsewhere. 25 PET rod-like samples, ca. 0.3 mm in diameter, were made using the melt flow indexer (XNR-450, China) at a temperature of 290 o C and with a load of 1.2 kg.…”

Section: Methodsmentioning

confidence: 99%

“…Further, the PET/SiO 2 nanocomposite fibers have good thermal and chemical stability, excellent mechanical properties, and well dyeability. [24][25][26][27][28][29] In this work, we attempted to prepare PET/SiO 2 composite fibers used a novel technology called laser melt electrospinning. We found that the micro/ nanofibers were easily obtained by this method without especially skilled techniques.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of PET/SiO₂ composite micro/nanofibers by a laser melt‐electrospinning system

Liu

Wang

et al. 2012

J of Applied Polymer Sci

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Poly(ethylene terephthalate) (PET)/SiO2 composite micro/nanofibers were successfully prepared by a laser melt‐electrospinning system. The fibers with diameter ranging from 500 nm to 7 μm were obtained. The effect of laser current and applied voltage on the fibers morphologies was investigated by scanning electron microscopy (SEM), and the results showed that the relationship of process parameters and fibers diameter was complicated. The EDS analysis confirmed the presence of SiO2 in the PET fibers matrix. The crystallization behavior of the electrospun PET/SiO2 micro/nanofibers was investigated using X‐ray diffraction (XRD) analysis and differential scanning calorimetry (DSC), and it was found that the as‐electrospun fibers exhibited an amorphous phase. After heat‐treatment at 120 and 160°C for 1 h, respectively, the fibers showed a high crystallinity. The thermal properties of fibers were studied using thermogravimetry‐differential thermal analysis (TG–DTA), and showed the electrospun PET/SiO2 composite fibers was not effective difference of thermostability compared with PET fibers when used for fibers materials. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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“…The precursor for the polyimide was characterized by FTIR spectroscopy, and Figures 6 shows the cm À1 (CH 3 bending) and 1025 and 980 cm À1 (C-O stretching). 29,30,[43][44][45] The vibrations observed between 725 and 922 cm À1 are due to the various C-H stretching modes of the phenyl ring of the polyimide. It was observed that when the SP (dimethyl-ester of polyamic acid) was heat-treated above 150 C, it was converted to the corresponding polyimide.…”

Section: Characterization Of Polyimide and Polyimide/batio 3 Hybrid T...mentioning

confidence: 99%

High-Dielectric Constant Inorganic–Organic Hybrid Materials Prepared with Sol–Gel-Derived Crystalline BaTiO₃

Pramanik

Seok

2008

jjap

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The preparation of ceramic/polymer composites (BaTiO 3 -polymer in particular) has received much current interest for various electronic applications, because of the possibility of combining the effect of the processability of the organic components with that of the desired electrical properties of the ceramics. The synthesis of polyimide-based inorganic-organic hybrid thin films containing crystalline BaTiO 3 nanoparticles and their dielectric properties are discussed. The precursor for the polyimide was prepared from benzophenone-3,3 0 ,4,4 0 -tetracarboxylic dianhydride (BTDA) and 4,4 0 -diamino-3,3 0 -dimethyl diphenyl methane (DADMDPM) and used as an organic matrix for a ceramic/polymer hybrid and that of the crystalline BaTiO 3 nanoparticles was prepared by the wet-chemical decomposition of the [Ti(acac) 3 ] þ complex with Ba(OH) 2 . The BaTiO 3 , prepared by the decomposition of the Ti-acac complex showed good crystallinity (average particle size = 90 nm) with better dispersibility in an organic medium (NMP). Crack-free thin films of 3.5 -4.5 mm thickness were obtained by a single spin coating operation after curing the air-dried films at 150 C. The polyimide/BaTiO 3 hybrids exhibited a wide range of relative permittivity values (" ¼ 3:81{ 31:57) at room temperature.

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Preparation and characterization of metal-containing aromatic polyimides

Cited by 12 publications

References 9 publications

Ultra‐Tough Waterborne Polyurethane‐Based Graft‐Copolymerized Piezoresistive Composite Designed for Rehabilitation Training Monitoring Pressure Sensors

Ultra‐Tough Waterborne Polyurethane‐Based Graft‐Copolymerized Piezoresistive Composite Designed for Rehabilitation Training Monitoring Pressure Sensors

Preparation and properties of PET/SiO₂ composite micro/nanofibers by a laser melt‐electrospinning system

High-Dielectric Constant Inorganic–Organic Hybrid Materials Prepared with Sol–Gel-Derived Crystalline BaTiO₃

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Preparation and characterization of metal-containing aromatic polyimides

Cited by 12 publications

References 9 publications

Ultra‐Tough Waterborne Polyurethane‐Based Graft‐Copolymerized Piezoresistive Composite Designed for Rehabilitation Training Monitoring Pressure Sensors

Ultra‐Tough Waterborne Polyurethane‐Based Graft‐Copolymerized Piezoresistive Composite Designed for Rehabilitation Training Monitoring Pressure Sensors

Preparation and properties of PET/SiO2 composite micro/nanofibers by a laser melt‐electrospinning system

High-Dielectric Constant Inorganic–Organic Hybrid Materials Prepared with Sol–Gel-Derived Crystalline BaTiO3

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Product

Resources

About

Preparation and properties of PET/SiO₂ composite micro/nanofibers by a laser melt‐electrospinning system

High-Dielectric Constant Inorganic–Organic Hybrid Materials Prepared with Sol–Gel-Derived Crystalline BaTiO₃