Thermoplastic polyimides are derived from _______________ reaction between diamines and _______________.
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Answer:
Thermoplastic polyimides are derived from _Imidization_ reaction between diamines and _dianhydrides_.
Explanation:
- Polyimides obtained by reaction of pyromellitic acid diimide with aliphatic dihalides19 or bis halo methyl disiloxanes20 were insoluble and had low molecular weights
- Thermoplastics are moldable at certain elevated temperatures and solidifies at cooling. and are most suitable for films and fiber cable .
- High pretilt angles were obtained with high level of imidization, rigid tetracarboxylic anhydride moiety and uneven distribution of fluorine atoms in polymer film.
- It has been also found that the orientation of polyimide film on thin layer surface played an important role in aligning liquid crystal molecules on the surface.
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