Effect of clay on properties of polyimide-clay nanocomposites

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Department of Chemistry, Center for Nanotechnology, Chung-Yuan Christian University, Chung-Li 320, Taiwan [1 ]
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Journal of Applied Polymer Science | 2007年 / 104卷 / 01期
关键词：
Effect of clay on mechanical; thermal; moisture absorption; and dielectric properties of polyimide-clay nanocomposites was investigated. Nanocomposites of polyimide (ODA-BSAA) hybridized with two modified clay (PK-802 and PK-805) were synthesized for comparison. The silicate layers in the polymer matrix were intercalated/exfoliated as confirmed by wide-angle X-ray diffraction and transmission electron microscopy. Thermal stability; and storage modulus for these nanocomposites are improved as hybridized clay increases. Reduced dielectric constants due to the hybridization of layered silicates are observed at frequencies of 1 kHz-1 MHz and temperatures of 35-150°C. The tetrahedrally substituted smectite (PK-805) resulted in higher mechanical strength and dielectric constants than those of octahedrally substituted smectite (PK-802); which could be attributed to their stronger ionic bonding between clay layer and polymer matrix. © 2007 Wiley Periodicals; Inc;
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页码：318 / 324
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