Preparation and properties of LDHs/polyimide nanocomposites

被引:205
作者
Hsueh, HB [1 ]
Chen, CY [1 ]
机构
[1] Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan
关键词
polyimide; layered double hydroxides (LDHs); nanocomposites;
D O I
10.1016/S0032-3861(02)00887-X
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Layered double hydroxides/polyimide (LDHs/PI) nanocomposites were prepared from solution of polyamic acid (polyimide precursor) and LDH-amino benzoate using N,N-dimethylacetamide as a solvent. LDH-amino benzoate (LDH-AB) was obtained by coprecipitation method. The amino benzoate, grafted on the surface of the Mg/Al nanolayers, as a connector improved the compatibility between the inorganic Mg/Al nanolayers and the organic polyimide molecules. The dispersion behavior of Mg/Al nanolayers was investigated by transmission electron microscopy and X-ray diffraction, indicating that the Mg/Al nanolayers were exfoliated in PI matrix to form LDHAB/PI nanocomposites, The maximum tensile strength and elongation of the LDH-AB/PI nanocomposites were found with the LDH-AB content of 5 and 4 wt%; respectively. The initial tensile modulus of these nanocomposites was increased with the LDH-AB content. These nanocomposites exhibited higher storage and loss moduli compared to those of pure PI. T, of these nanocomposites increased with the LDH-AB content: Coefficients of thermal expansion (CTE, below and above T-g) of these nanocomposites deceased with the LDH-AB content. The thermal properties of these nanocomposites were enhanced by the incorporation of Mg/Al nanolayers in PI matrix. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1151 / 1161
页数:11
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