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- W2027302633 abstract "The thickness dependence of the anisotropy in thermal expansion of poly(pyromellitic dianhydride oxydianiline) (PMDA-ODA) with flexible chains and poly(biphenylene tetracarboxylic dianhydride p-phenylene diamine) (BPDA-PDA) ranging from 2.5 to 20 μm has been investigated. The lateral (in-plane) coefficient of thermal expansion (CTE) of PMDA-ODA and BPDA-PDA increases with increasing film thickness; in contrast, the vertical (out-of-plane) CTE of PMDA-ODA and BPDA-PDA decreases with increasing film thickness. The vertical CTE of PMDA-PDA is 4–7 times larger than the lateral CTE. The vertical CTE of BPDA-PDA is 14–20 times larger than the lateral CTE. It is believed that the thickness dependence of the anisotropy in CTE is caused by the in-plane orientation of the polyimide main chain. Since BPDA-PDA has a rigid-rod-like structure, this leads to a better in-plane orientation and a larger anisotropy in CTE than PMDA-ODA." @default.
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- W2027302633 date "1999-02-01" @default.
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- W2027302633 title "Thickness dependence of the anisotropy in thermal expansion of PMDA-ODA and BPDA-PDA thin films" @default.
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- W2027302633 doi "https://doi.org/10.1016/s0040-6090(98)01065-7" @default.
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