Synthesis and properties of new polyimide/clay nanocomposite films

A series of polymer–clay nanocomposite (PCN) materials consisting of polyimide and typical clay were prepared by solution dispersion. Quaternary alkylammonium modified montmorillonite, Cloisite 20A, was used as organoclay. Poly(amic acid) solution was prepared from the reaction of benzophenone-4,4′,...

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Bibliographic Details
Published in:Bulletin of materials science 2013-10, Vol.36 (5), p.789-798
Main Authors: MANSOORI, YAGOUB, SANAEI, SOMAYEH SHAH, ZAMANLOO, MOHAMMAD-REZA, IMANZADEH, GHOLAMHASSAN, ATGHIA, SEYED VAHID
Format: Article
Language:English
Subjects:
Acids
Chemistry and Materials Science
Clay
Clay (material)
Dielectric properties
Diffraction patterns
Dimethyl acetamide
Dimethyl sulfoxide
Dispersions
Engineering
Glass transition temperature
Interlayers
Materials Science
Mechanical properties
Montmorillonite
Nanocomposites
Nanomaterials
Nanostructure
Polyimide resins
Polymers
Silica
Solvents
Surface roughness
Thermodynamic properties
Uptakes
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Summary:A series of polymer–clay nanocomposite (PCN) materials consisting of polyimide and typical clay were prepared by solution dispersion. Quaternary alkylammonium modified montmorillonite, Cloisite 20A, was used as organoclay. Poly(amic acid) solution was prepared from the reaction of benzophenone-4,4′,3,3′-tetracarboxylic dianhydride and 2-(5-(3,5-diaminophenyl)-1,3,4-oxadiazole-2-yl) pyridine in dimethylacetamide. Thermal imidization was performed on poly(amic acid)/organoclay dispersion in a regular temperature-programmed circulation oven. The study of interlayer d -spacing with X-ray diffraction pattern indicates that an exfoliated structure may be present in the nanocomposite 1%. Intercalated structures were obtained at higher organoclay loadings. Nanocomposites were studied using thermogravimertic analysis and differential scanning calorimetry. Nanocomposites exhibit higher glass transition temperature and improved thermal properties compared to neat polyimide due to the interaction between polymer matrix and organoclay particles. The results are also compared with data of a similar work. Morphology study with scanning electron microscopy showed that the surface roughness in nanocomposite 1% increased with respect to pristine polyimide. Solvent uptake measurements were also carried out for the prepared materials. Maximum solvent adsorption was observed for dimethyl sulfoxide (DMSO). It was found that the solvent uptake capacity decreased with increasing clay content.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-013-0542-4