Synthesis and properties of soluble aromatic polyimides from novel 4,5-diazafluorene-containing dianhydride
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DOI: 10.1039/c7ra12101f
Abstract: A series of organo-soluble, high glass transition temperature (Tg), and low dielectric constant aromatic polyimides containing 4,5-diazafluorene in the polymer chain were synthesized from a novel dianhydride monomer, 9,9-di[4-(3,4-dicarboxyphenoxy)phenyl]-4,5-diazafluorene dianhydride. The introduction of 4,5-diazafluorene units… read more here.
Keywords: properties soluble; diazafluorene; soluble aromatic; synthesis properties ... See more keywords
Isomeric Aromatic Polyimides Containing Biphenyl Moieties for Gas Separation Applications
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DOI: 10.3390/polym15061333
Abstract: An optimized synthesis of the monomer 2,2′3,3′-biphenyltetracarboxylic dianhydride, iBPDA, was performed to obtain high molecular weight polymers. This monomer has a contorted structure that produces a non-linear shape, hindering the packing of the polymer chain.… read more here.
Keywords: gas; gas separation; isomeric aromatic; separation applications ... See more keywords