Preparation, Characterization and Thermal Degradation of Polyimide 4-APS-BTDA-SiO2 Composite FilmsReport as inadecuate




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1

Department of Chemistry, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

2

Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology ITMA, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

3

Department of Chemistry, Islamic Azad University Behbahan Branch, University Street, Behbahan, 6361713198, Iran

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Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

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Department of Physic, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia





*

Author to whom correspondence should be addressed.



Abstract Polyimide-SiO2 composite films were prepared from tetraethoxysilane TEOS and polyamic acid PAA based on aromatic diamine 4-aminophenyl sulfone 4-APS and aromatic dianhydride 3,3,4,4-benzophenonetetracarboxylic dianhydride BTDA via a sol-gel process in N-methyl-2-pyrrolidinone NMP. The prepared polyimide-SiO2 composite films were characterized using X-ray diffraction XRD, Fourier transform infrared spectroscopy FTIR, scanning electron microscope SEM and thermogravimetric analysis TGA. The FTIR results confirmed the synthesis of polyimide 4-APS-BTDA and the formation of SiO2 particles in the polyimide matrix. Meanwhile, the SEM images showed that the SiO2 particles were well dispersed in the polyimide matrix. Thermal stability and kinetic parameters of the degradation processes for the prepared polyimide-SiO2 composite films were investigated using TGA in N2 atmosphere. The activation energy of the solid-state process was calculated using Flynn–Wall–Ozawa’s method without the knowledge of the reaction mechanism. The results indicated that thermal stability and the values of the calculated activation energies increased with the increase of the TEOS loading and the activation energy also varied with the percentage of weight loss for all compositions. View Full-Text

Keywords: polyimide; silica; activation energy; thermogravimetric analysis polyimide; silica; activation energy; thermogravimetric analysis





Author: Mansor Bin Ahmad 1,* , Yadollah Gharayebi 2,3, Mohd. Sapuan Salit 4, Mohd. Zobir Hussein 1,2, Saeideh Ebrahimiasl 2 and Arash Dehzangi 5

Source: http://mdpi.com/



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