title: Preparation, characterization and thermal degradation of polyimide (4-APS/BTDA)/SiO(2) composite films.
abstract: Polyimide/SiO(2) composite films were prepared from tetraethoxysilane (TEOS) and poly(amic 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/SiO(2) 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 SiO(2) particles in the polyimide matrix. Meanwhile, the SEM images showed that the SiO(2) particles were well dispersed in the polyimide matrix. Thermal stability and kinetic parameters of the degradation processes for the prepared polyimide/SiO(2) composite films were investigated using TGA in N(2) 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.
authors.affiliation: Department of Chemistry, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: Mansor
authors.initials: M
authors.lastname: Bin Ahmad
authors.affiliation: Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.|Department of Chemistry, Islamic Azad University Behbahan Branch, University Street, Behbahan, 6361713198, Iran.
authors.forename: Yadollah
authors.initials: Y
authors.lastname: Gharayebi
authors.affiliation: Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: Mohd Sapuan
authors.initials: MS
authors.lastname: Salit
authors.affiliation: Department of Chemistry, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.|Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: Mohd Zobir
authors.initials: MZ
authors.lastname: Hussein
authors.affiliation: Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: Saeideh
authors.initials: S
authors.lastname: Ebrahimiasl
authors.affiliation: Department of Physic, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia.
authors.forename: Arash
authors.initials: A
authors.lastname: Dehzangi
mesh_terms: D001555:Benzene Derivatives / Q000737:chemistry; D001672:Biocompatible Materials / Q000138:chemical synthesis* / Q000737:chemistry; D006358:Hot Temperature; D008855:Microscopy, Electron, Scanning; D011108:Polymers / Q000737:chemistry; D012117:Resins, Synthetic / Q000138:chemical synthesis* / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D001555:Benzene Derivatives; D001672:Biocompatible Materials; D011108:Polymers; D012117:Resins, Synthetic; D012821:Silanes; C513053:polyamic acid; C029945:polyimide resin; C040733:tetraethoxysilane; D012822:Silicon Dioxide