Indane polyimides

The best-known are General Electric Ultem poly (ether imides) these offer heat deflection temperatures of 207 to 221°C and continuous service temperatures of 170 to 180°C. Also popular are Amoco Torlon polyamide-imides, with heat deflection temperatures of 278 to 282°C. More specialized are Ciba-Geigy trimethyl phenyl indane polyimides, with heat deflection temperatures of 232 to 257°C, embrittlement times of >2000 hr at 200°C... 

Fully imidized soluble polyimides have ben prepared using monomers derived from diphenylindane and aromatic dianhydrides. Technical polymers (XU218, for instance), prepared from 1,1,3-trimethyl-diaminophenylindane and benzophenone-tetracarboxylic acid dianhydride, have been marketed over the last decade. Despite the partially aliphatic nature of polyimides containing the indane group, they show considerable retention of the thermal stability, with Tg values over 300 °C [107-110]. 

MATRIMID CIBA-Geigy Indane containing polyimide... 

As shown in Tables EH and V, the permeability coefiBcients of the poly(ether ketone)s and the polyimides are comparable. Only polymer 9g, which contains the bulky, relatively rigid trimethylcyclohexyl linker in the bisphenol unit, exhibits significantly increased permeability coefficients relative to the other polymers in this study. Also, it is clear that the substantial increase in permeability coefficients that was initially expected from the introduction of the indan group, especially with the two cyclohexyl substituents, is not observed. Figures 1 and 2 show the common plots of loga vs. log P for the poly(ether ketone)s and the polyimides. 

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