The structural analysis of Cardo silicone polyimides by high resolution solid-state 13C, 15N and 29Si NMR

It is well-known that polymers containing a fluorene moiety (so-called ‘Cardo-type polymers’) have high thermal stability, good mechanical properties and excellent solubility in common organic solvents. For the benefit of the full use of these polyimides in industrial applications, cross-linked Card...

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Bibliographic Details
Published in:Journal of molecular structure 1998, Vol.441 (2), p.189-203
Main Authors: Shinohara, Masaaki, Saito, Koji, Hatakeyama, Moriaki, Yuasa, Masatoshi, Furukawa, Nobuyuki
Format: Article
Language:English
Subjects:
CPMAS
High-resolution solid-state 13C, 15N and 29Si NMR
Polyimides
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Summary:It is well-known that polymers containing a fluorene moiety (so-called ‘Cardo-type polymers’) have high thermal stability, good mechanical properties and excellent solubility in common organic solvents. For the benefit of the full use of these polyimides in industrial applications, cross-linked Cardo silicone polyimides, which have both high thermal stability and high resistivity to organic solvents, were designed. The cross-link density was determined by solid-state 13C and 29Si NMR because no other direct method for the determination of the cross-link density is available. Furthermore, natural abundance CPMAS 13C and 15N NMR measurements were made for three different forms of Cardo silicone polyimides which exhibit a high oxygen permselective property. An explanation for the gas separation mechanism is given.
ISSN:0022-2860
1872-8014
DOI:10.1016/S0022-2860(97)00298-6