Fabrication and Investigation on the Polyimide/Al2O3 Composite Films via Ion Exchange Technology

2021 ◽  
Vol 871 ◽  
pp. 264-270
Author(s):  
Ming Yu Zhang ◽  
Ya Wang ◽  
Li Zhu Liu ◽  
Wei Song ◽  
Chun Qi Zhang
Keyword(s):  
Ion Exchange ◽  
Breakdown Strength ◽  
Composite Films ◽  
Interface Layer ◽  
Polyimide Films ◽  
Hydrolysis Time ◽  
Alumina Layer ◽  
Pristine Film ◽  
Better Than ◽  
Exchange Technique

Polyimide/Al2O3 films were prepared by the surface modification with different hydrolysis time, ion exchange technique and heat treatment using polyimide films as the substrates and aluminum chloride as the precursor of Al2O3. The morphology, thermal properties and electrical properties of the composite films were characterized and tested. The results indicated the alumina distributed in certain thickness on the surface of the films and there was a clear interface layer between the alumina layer and the substrate. The breakdown strength of the composite films maintains the excellent properties of the pristine film while the thermal and corona-resistant time properties of composite films were better than the pristine film due to introducing aluminum oxide. The composite film which used KOH to treat for 90 min has the longest corona-resistant time (101.2 min), which was almost 10 times longer than the pristine film.

Fabrication, Morphology and Properties of Polyimide/Al2O3 Nanocomposite Films via Surface Modification and Ion-Exchange Technique

2018 ◽  
Vol 921 ◽  
pp. 91-98
Author(s):  
Ming Yu Zhang ◽  
Li Zhu Liu ◽  
K.S. Hui
Keyword(s):  
Ion Exchange ◽  
Composite Film ◽  
Original Film ◽  
Treatment Time ◽  
Breakdown Strength ◽  
Composite Films ◽  
Nanocomposite Films ◽  
Polyimide Films ◽  
Force Microscopy ◽  
Corona Resistance

Polyimide films with Al2O3composite layers were prepared by KOH solution surface hydrolysis, ion exchange and heat treatment. Scanning electron microscope (SEM), atomic force microscopy (AFM), X-ray diffractometry (XRD), thermo gravimetric analyzer (TGA), breakdown voltage tester, high frequency pulse voltage machine were performed to characterize the micromorphology, thermal stability, mechanical properties, electric breakdown strength, and corona resistance time of composite films. Results indicated that the thermal properties of the composite film are better than the original film. The corona resistance time of the composite film was longer than that of the pristine film. The composite film had the longest corona resistance time and reached 101.2min while the KOH treatment time was 90min.

Fabrication and characterization of polyimide/Al2O3 composite films via surface modification and ion exchange technique

2016 ◽  
Vol 45 (1) ◽  
pp. 30-37 ◽  
Author(s):  
M.Y. Zhang ◽  
L.Z. Liu ◽  
L. Weng ◽  
W.W. Cui ◽  
K.S. Hui
Keyword(s):  
Surface Modification ◽  
Ion Exchange ◽  
Breakdown Strength ◽  
Composite Films ◽  
Annealing Treatment ◽  
Ambient Air ◽  
Ammonia Solution ◽  
Excellent Thermal Stability ◽  
Content Type ◽  
General Importance

Purpose – The aim of this study was to fabricate polyimide (PI)/Al2O3 composite films via surface modification and ion exchange techniques, and examine their properties. Design/methodology/approach – The method involves hydrolyzing the PI film double surface layers in an aqueous potassium hydroxide (KOH) solution and incorporating aluminium ions (Al3+) into the hydrolyzed layers of the PI film via subsequent ion exchange, followed by a treatment of the Al3+-loaded PI films with an aqueous ammonia solution, which leads to the formation of Al(OH)3 in the surface-modified layers. After a final thermal annealing treatment in ambient air, the Al(OH)3 decomposes to Al2O3, and forms composite layers on both surfaces of the re-imidized PI film. Findings – The PI/Al2O3 composite film obtained with a 6 hours of KOH treatment exhibited excellent thermal stability, good mechanical properties and better electric breakdown strength and corona-resistance properties than the pristine PI film. Practical implications – The method for obtaining the composite films in this paper is worth consideration, but additional research will be needed. Furthermore, this method is of general importance for the fabrication of composite PI films with tailored properties. Originality/value – This study showed that surface modification and ion-exchange techniques are powerful methodologies for the fabrication of PI/Al2O3 composite films.

Effect of Alkali Treatment on the Mechanical Property of Polyimide Film

2017 ◽  
Vol 744 ◽  
pp. 364-369 ◽  
Author(s):  
Ming Yu Zhang ◽  
Li Zhu Liu ◽  
K.S. Hui ◽  
K.N. Hui
Keyword(s):  
Mechanical Properties ◽  
Ion Exchange ◽  
Treatment Time ◽  
Alkali Treatment ◽  
Polyimide Film ◽  
Polyimide Films ◽  
Future Studies ◽  
Polyimide Composites ◽  
First Time ◽  
Better Than

Polyimide films treated with an alkali and ion exchange undergo surface-confined hydrolysis to produce polyimide composites. On the other hand, it is unclear what impact this method has on the mechanical properties of PI films. This paper reports the effects of the mechanical properties of PI films exposed to an alkali (KOH) solution with different treatment time. The mechanical properties of the re-cycloimidization PI films were improved when the proper initial KOH treatment time was used. The reason might be that PI could effectively reduce the formation of the shear zone to cracks due to the increase in ductility after the proper KOH treatment and more ductile PI chains led to re-orientation at the drawing process. Therefore, the strength and elongation of the re-cycloimidization PI films were better than those of the pristine PI films. This study focused on the effects of the KOH treatment on the mechanical properties of the PI film for the first time and proposed a mechanism to explain the reason that the appropriate time of KOH treatment can enhance the mechanical properties. The results presented here can provide guidelines for preparing composite PI films via ion-exchange by the proper KOH treatment time in future studies.

Formation and characterization of cobalt oxide layers on polyimide films via surface modification and ion-exchange technique

2010 ◽  
Vol 518 (15) ◽  
pp. 4175-4182 ◽  
Author(s):  
Shuxiang Mu ◽  
Zhanpeng Wu ◽  
Yue Wang ◽  
Shengli Qi ◽  
Xiaoping Yang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Ion Exchange ◽  
Cobalt Oxide ◽  
Polyimide Films ◽  
Oxide Layers ◽  
Exchange Technique

Ultrahigh Energy Storage Performances of Polymer-based Nanocomposite via Interfaces Engneering

2020 ◽  
Author(s):  
Peng Wang ◽  
Zhongbin Pan ◽  
Weilin Wang ◽  
Jianxu Hu ◽  
Jinjun Liu ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Energy Storage ◽  
High Performance ◽  
Breakdown Strength ◽  
Composite Films ◽  
Power Electronic ◽  
Ultrahigh Energy

High-performance electrostatic capacitors are in urgent demand owing to the rapidly development of advanced power electronic applications. However, polymer-based composite films with both high breakdown strength (Eb) and dielectric constant...

An ion-exchange technique for concentrating ammonia from small volumes of seawater

1981 ◽  
Vol 10 (2) ◽  
pp. 159-164 ◽  
Author(s):  
Ronald T. Riley ◽  
Michael C. Mix
Keyword(s):  
Ion Exchange ◽  
Exchange Technique

scholarly journals Effects of Interfacial Charge on the DC Dielectric Properties of Nanocomposites

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Jiaming Yang ◽  
Congji Liu ◽  
Changji Zheng ◽  
Hong Zhao ◽  
Xuan Wang ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Breakdown Strength ◽  
Interface Layer ◽  
Low Density Polyethylene ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Effects ◽  
Dielectric Performance ◽  
Positive Effect ◽  
Interfacial Charge

The interfacial charge phenomenon of MgO/low-density polyethylene (LDPE) and SiO2/LDPE nanocomposites was measured by synchrotron radiation small-angle X-ray scattering. Based on the Porod theory, the Porod curve of SiO2/LDPE nanocomposite shows negative divergence but the LDPE and MgO/LDPE do not, which reveals that interfacial charge may exist in the SiO2/LDPE nanocomposite. The DC dielectric properties of the nanocomposites are closely related to the interfacial charge. Experimental results show that the SiO2/LDPE nanocomposite has lower DC conductivity, less space charge, and higher DC breakdown strength than the MgO/LDPE nanocomposite. It is thought that the interfacial charge has a positive effect on the DC dielectric performance of nanocomposites, and the mechanism could be attributed to the scattering effects of the interfacial charge on the carrier migration. There is no obvious interfacial charge in the MgO/LDPE nanocomposite, but it still has excellent DC dielectric properties compared with LDPE, which indicates that the interfacial charge is not the only factor affecting the dielectric properties; the dipole interface layer and the reduction of free volume can also inhibit the migration of carriers and decrease electrons free path, improving the dielectric performance.

ChemInform Abstract: Catalytic Asymmetric Dihydroxylation of Olefins with New Catalysts: The First Example of Heterogenization of OsO42- by Ion-Exchange Technique.

ChemInform ◽  
2010 ◽  
Vol 33 (4) ◽  
pp. no-no
Author(s):  
Boyapati M. Choudary ◽  
Naidu S. Chowdari ◽  
Mannepalli L. Kantam ◽  
Kondapuram V. Raghavan
Keyword(s):  
Ion Exchange ◽  
Asymmetric Dihydroxylation ◽  
Catalytic Asymmetric ◽  
Exchange Technique
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