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• W2011193889 abstract "Several high temperature polyimides, as model polymers with various chain rigidities and chain orders, were synthesized through the polycondensation of p-phenylene diamine (PDA) with five different aromatic dianhydrides [i.e., pyromellitic dianhydride (PMDA), biphenyltetracarboxylic dianhydride (BPDA), 4,4′-oxydiphthalic anhydride (ODPA), benzophenonetetracarboxylic dianhydride (BTDA), and 4,4′-hexafluoroisopropylidenediphthalic anhydride (6F)], and investigated in terms of structure and properties. Both fully rodlike PMDA-PDA and ether-linked ODPA-PDA polyimides showed excellent orientation and poor ordering of chain in x-ray diffraction patterns, whereas both biphenyl-linked (BPDA-PDA) and carbonyl-linked (BTDA-PDA) polyimides exhibited excellent orientation and high ordering of chain. However, hexafluoroisopropylidene-linked 6F-PDA polyimide is structureless. The coherence length along the chain axis, which is a measure of chain rigidity and ordering, was estimated from (00l) peaks of x-ray diffraction patters: 6F-PDA (could not be measured) &lt;ODPA-PDA (95 Å)&lt;BTDA-PDA (98 Å)&lt;BPDA-PDA (104 Å)&lt;PMDA-PDA (130 Å). In films prepared on substrates, all polyimides were preferentially oriented in the film plane. However, the degree of molecular in-plane orientation strongly depended on the coherence length. Higher coherence length, i.e., higher chain rigidity and ordering, caused higher in-plane orientation of chains. However, the chain rigidity is more critically responsible for molecular in-plane orientation, in comparison to the chain ordering. Higher in-plane orientation of chains led to larger anisotropies of refractive indices and dielectric constants, higher in-plane modulus, lower in-plane thermal expansion coefficient, and lower residual stress." @default.
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• W2011193889 date "1997-01-15" @default.
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• W2011193889 title "Structure, chain orientation, and properties in thin films of aromatic polyimides with various chain rigidities" @default.
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• W2011193889 doi "https://doi.org/10.1063/1.364210" @default.
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