Preparation and Characterization of Transparent Polyimide/Silica Composite Films by a Sol-Gel Reaction

Title
Preparation and Characterization of Transparent Polyimide/Silica Composite Films by a Sol-Gel Reaction
Author(s)
이승우장아름권세진배준황초롱[황초롱]원종찬[원종찬]채복남[채복남]
Keywords
SILICA HYBRID; THIN-FILMS; TRIFLUOROMETHYL GROUPS; TRANSPORT-PROPERTIES; MEMBRANES; MICROELECTRONICS; NANOCOMPOSITE; IMIDIZATION; COLORLESS; INDEX
Issue Date
201312
Publisher
TAYLOR & FRANCIS LTD
Citation
MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.584, no.1, pp.9 - 17
Abstract
A series of transparent, 100 m thick, polyimide (PI) composite films were prepared by a sol-gel reaction using a thermal imidization process between poly(amic acid) (PAA) and various amounts of tetraethyl orthosilicate (TEOS) in N,N-dimethylacetamide. The PAA were prepared using 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 2,2'-bis(trifluoromethyl)benzidine (TFMB) and 3,5-diaminobenzoic acid (DABA). The chemical structure and thermal stability of the PI/silica composite films were examined in detail by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The PI/silica composite films showed high thermal stability, and the degradation behavior was found to be dependent on the amount used. In addition, the optical and thermo-mechanical properties of the films were investigated, including the haze values, yellow indices and in-plane coefficients of thermal expansion (CTE). The CTE values of the PI/silica composite films were 52.0 - 43.5ppm/degrees C, and were dependent on the amount of TEOS used. The haze values and yellow indices increased with increasing TEOS concentration. Optically transparent PI/silica composite films were obtained with a TEOS content of up to 20wt%.
URI
http://hdl.handle.net/YU.REPOSITORY/28212http://dx.doi.org/10.1080/15421406.2013.844878
ISSN
1542-1406
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공과대학 > 화학공학부 > Articles
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