Effective improvement in microwave absorption by uniform dispersion of nanodiamond in polyaniline through in-situ polymerization

The BaFe12O19 nanoparticles was prepared by sol-gel method in different temperature (750°C,850°Cand 950°C), and then BaFe12O19/polyaniline nanocomposites was synthesized by in situ polymerization. The XRD, FTIR spectra, SEM and vector network analyzer were used to analyze the "" chemical component, morphology and microwave absorption property of the nanocomposites. The result show that BaFe12O19 can be generated at 750°C without any impurity ,and its size increased with increase of calcination temperature.BaFe12O19 nanoparticle was coated with polyaniline partially, and we can get it have interaction with polyaniline through FTIR spectra. While the ferrite calcined at 850°C,the thickness of the absorbing material is 4.5mm,the nanocomposites have the largest reflection loss of-17.6 dB at 6 GHz,and its reflection loss values less than−10 dB in the range of 5-7.4GHz.

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Crystallization Behaviour of Nano-ZnO/PET and Nano-ZnO/Polyethylene Glycol (PEG)/PET Composites by In Situ Polymerization

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.334-335.853 ◽

2007 ◽

Vol 334-335 ◽

pp. 853-856 ◽

Cited By ~ 4

Author(s):

Jie Tao ◽

Xiang Dong ◽

Tao Wang ◽

Yi Hua Cui

Keyword(s):

Polyethylene Glycol ◽

In Situ Polymerization ◽

Crystallization Rate ◽

Nano Particles ◽

Nano Zno ◽

Nano Zinc Oxide ◽

Uniform Dispersion ◽

Nano Zinc ◽

Polymerization Method

In order to improve the crystallization properties of the polyethylene terephthalate (PET), nano-zinc oxide (nano-ZnO)/PET and nano-ZnO/polyethylene glycol (PEG)/PET composites were successfully synthesized by in-situ polymerization method in this work. The experimental results indicated that nano particles can accelerate the crystallization of the PET which was demonstrated by increase in the intensities of the XRD peaks. PEG and PET form copolymer in composites, leading to the improvement of the flexibility of the molecule chain. Meanwhile, PEG was able to encapsulate the nano particles to make them have both good compatibility to matrix and uniform dispersion in the composites. Therefore, the crystallization rate and crystallization capability of nano-ZnO/PEG/PET composites were reasonably raised.

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Polypyrrole Chains Decorated on CoS Spheres: A Core-Shell Like Heterostructure for High-Performance Microwave Absorption

Nanomaterials ◽

10.3390/nano10010166 ◽

2020 ◽

Vol 10 (1) ◽

pp. 166 ◽

Cited By ~ 4

Author(s):

Hui Liu ◽

Guangzhen Cui ◽

Ling Li ◽

Zhi Zhang ◽

Xuliang Lv ◽

...

Keyword(s):

Microwave Absorption ◽

High Performance ◽

In Situ Polymerization ◽

Impedance Matching ◽

Synthesis Method ◽

Interfacial Polarization ◽

Cobalt Sulfide ◽

Core Shell ◽

Loss Mechanism

Cobalt sulfide composites have exhibited great potential in terms of microwave absorption, owing to their low price, relatively high capacitance, and excellent electrocatalytic activity. Thus, a novel core-shell like structure comprising cobalt sulfide@polypyrrole (CoS@PPy) composite was synthesized by a facile solvothermal synthesis method and in situ polymerization. When coated by the heterostructure polypyrrole aerogel, CoS@PPy composite exhibited excellent microwave absorption properties with an optimal reflection loss (RL) of −41.8 dB at 6.96 GHz. Furthermore, the absorption bandwidth (RL < −10 dB) of 5.4 GHz could be reached at a coating thickness of 2.05 mm, probably attributing to the synergistic effect of good impedance matching, interfacial polarization, dipole polarization, and conductivity loss. Moreover, this work proposed a loss mechanism mode which probably occurred in the CoS@PPy composites. It was demonstrated that the CoS@PPy composite is a promising material in the field of electromagnetic wave absorption.

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Construction and Microwave Absorption Properties of Core@Double-Shell Structured Fe3O4@Polyaniline@MnO2 Nanospheres

NANO ◽

10.1142/s1793292020500320 ◽

2020 ◽

Vol 15 (03) ◽

pp. 2050032 ◽

Cited By ~ 1

Author(s):

Wentong Yang ◽

Xiansen Yang ◽

Xiang Li ◽

Md. Zahidul Islam ◽

Yubing Dong ◽

...

Keyword(s):

Microwave Absorption ◽

In Situ Polymerization ◽

Impedance Matching ◽

Multiple Reflections ◽

Absorption Properties ◽

Microwave Absorption Properties ◽

The Core ◽

Absorption Performance ◽

Minimum Reflection Loss

In this paper, we designed a core@double-shell nanostructure to enhance the electromagnetic wave absorption performance of hybrid nanospheres. Herein, the core@double-shell structured Fe3O4@polyaniline@MnO2 nanospheres were successfully prepared by a facile solvothermal process and in situ polymerization methods. The morphology, structure, magnetism and microwave absorption properties were studied. The results reveal that the FPM nanospheres exhibit extraordinary microwave absorbing performance compared to those of either Fe3O4 or Fe3O4@polyaniline nanospheres. The minimum reflection loss of the FPM nanospheres is [Formula: see text]14.7[Formula: see text]dB at 15.76[Formula: see text]GHz with the thickness of 3.5[Formula: see text]mm, and the corresponding effective absorption bandwidth can reach 4.75[Formula: see text]GHz. The perfect EMW absorption of nanospheres can be ascribed to multi-interface polarization, multiple reflections and good impedance matching originated from the core@double-shell nanostructure.

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Synthesis and Microwave Absorption Properties of Core-Shell Structured Co3O4-PANI Nanocomposites

Journal of Nanomaterials ◽

10.1155/2015/845983 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 12

Author(s):

Hongyan Xu ◽

Zhenyin Hai ◽

Jiangtao Diwu ◽

Qiang Zhang ◽

Libo Gao ◽

...

Keyword(s):

Microwave Absorption ◽

Reflection Loss ◽

In Situ Polymerization ◽

Low Cost ◽

Core Shell ◽

Absorption Properties ◽

Microwave Absorption Properties ◽

The Core ◽

High Efficient

The core-shell structured Co3O4-PANI nanocomposites have been successfully prepared using an in situ polymerization method, while the core Co3O4 nanoparticles were synthesized by carbon-assisted method using degreasing cotton as a template. The obtained samples were characterized by XRD, TEM, FTIR, and XPS. The results indicated that the amorphous PANI was well covered on the surface of the spinel Co3O4 and the Co3O4-PANI with core-shell structure was formed with particle size of about 100 nm. The interfacial interaction of the core-shell nanocomposite greatly enhances the microwave absorption properties. The maximum reflection loss of Co3O4-PANI is up to −45.8 dB at 11.7 GHz with a thickness of 2.5 mm and the adsorption bandwidth with the reflection loss below −10 dB reaches 14.1 GHz ranging from 3.9 to 18 GHz when the thickness is between 2 and 5.5 mm. Therefore, the facilely synthesized and low-cost Co3O4-PANI nanocomposite with superior microwave absorption properties can be a promising nanomaterial for high efficient microwave absorption.

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Improved microwave absorption and electrostatic charge dissipation efficiencies of conducting polymer grafted fabrics prepared via in situ polymerization

Polymers for Advanced Technologies ◽

10.1002/pat.1873 ◽

2011 ◽

Vol 23 (3) ◽

pp. 343-349 ◽

Cited By ~ 52

Author(s):

Parveen Saini ◽

Veena Choudhary ◽

Sundeep. K. Dhawan

Keyword(s):

Microwave Absorption ◽

Conducting Polymer ◽

In Situ Polymerization ◽

Electrostatic Charge

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High-Strength GO/PA66 Nanocomposite Fibers via In Situ Precipitation and Polymerization

Polymers ◽

10.3390/polym13111688 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1688

Author(s):

Ao Gu ◽

Jian Wu ◽

Liming Shen ◽

Xiaoyan Zhang ◽

Ningzhong Bao

Keyword(s):

High Performance ◽

Melt Spinning ◽

In Situ Polymerization ◽

High Strength ◽

Interfacial Bonding ◽

Polymerization Process ◽

Precipitation Process ◽

Uniform Dispersion ◽

Nanocomposite Fibers

The uniform dispersion of graphene oxide (GO) and strong interfacial bonding are the key factors in achieving the high mechanical strength of GO/polymer composites. It is still challenging to prepare GO/PA66 composites with uniform GO dispersion by the in situ polymerization method. In this paper, we prepare GO/PA66 salt nanocomposite by in situ precipitating PA66 salt with GO in ethanol. The GO/PA66 nanocomposite fibers are then fabricated using the as-prepared GO/PA66 salt by in situ polymerizing and melt spinning. By tuning the GO content, the tensile strength and Young’s modulus of the GO/PA66 fibers are increased from 265 ± 18 to 710 ± 14 MPa (containing 0.3 wt% GO) and from 1.1 ± 0.08 to 3.8 ± 0.19 GPa (containing 0.5 wt% GO), respectively. The remarkable improvements are attributed to the uniform dispersion of GO in the GO/PA66 salt nanocomposite via ionic bonding and hydrogen bonding in the in situ precipitation process, and the covalent interfacial bonding between the GO and PA66 during the in situ polymerization process. This work sheds light on the easy fabrication of high-performance PA66-based nanocomposites.

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