期刊
JOURNAL OF MATERIALS SCIENCE
卷 47, 期 17, 页码 6354-6365出版社
SPRINGER
DOI: 10.1007/s10853-012-6560-6
关键词
-
资金
- National Science Fund, Bulgaria [DTK02-47]
Zeolite L, with the ratio Si/Al = 4, was prepared by hydrothermal method and used to obtain composite films based on a polyimide matrix having pendant carboxylic groups. The effect of zeolite L content on dielectric behavior and thermal stability of polyimide thin films was studied. The films were prepared by casting a suspension resulting from direct mixing of a poly(amic acid) (PAA) solution and zeolite L particles onto glass plates, followed by thermal imidization under controlled temperature conditions. The PAA was synthesized by solution polycondensation of a mixture of two diamines, 3,5-diaminobenzoic acid and 2,2-bis[4-(4-aminophenoxy)phenyl]propane (molar ratio 1:3), with 4,4'-oxydiphthalic anhydride, using N-methyl-2-pyrrolidone as solvent. To improve the compatibility between organic and inorganic phases, the surface of zeolite particles was modified by treating with 3-aminopropyltriethoxysilane. The surface morphology of the composite films investigated by scanning electron microscopy showed good compatibility between filler and polymer matrix. The films were flexible, tough, and exhibited high-thermal stability, having the initial decomposition temperature above 450 A degrees C. Dynamic mechanical analysis and dielectric spectroscopy revealed sub-glass transitions, gamma and beta, and an alpha relaxation corresponding to the segmental motions above the glass transition temperature. The values of the dielectric constant at 10 kHz and 200 A degrees C were in the range of 3.3-4.2.
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