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

Abstract

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.

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

“…The above results indicate that the thermal stability of pristine PI film could be improved by introducing Al 2 O 3 [16] . The electrical breakdown strength is a key parameter that is widely used to measure the insulating capability of the dielectrics, because breakdown would cause a short circuit, which could be a fatal malfunction for power equipment [1,2,4,6,14] . Fig.…”

“…Polyimide (PI) films have gained considerable importance as high-performance polymers and matrices, which have been widely used in microelectronic and electrical industries [1][2][3][4][5][6][7][8] . On the other hand, better quality is still needed in current advanced microelectronic and electrical applications.…”

Síntese, caracterização e modificação da hidroxiapatita com zinco para aplicação na reação de esterificação

“…Diferentes métodos podem ser encontrados na literatura para produção ou modificação da HAP sintética, dentre eles podemos citar: precipitação [3], o método sol-gel [4] e a troca iônica [5]. O processo de troca iônica pode ser classificado de duas maneiras bem distintas: a troca iônica em solução salina [6] e a troca iônica em estado sólido [7].…”