Journal
POLYMERS
Volume 11, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/polym11061058
Keywords
polyimide; POSS; optical transparency; thermal stability; shape memory effect
Categories
Funding
- Shanghai Science and Technology Innovation Plan Project [16JC1403700]
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Optically transparent polyimides with excellent thermal stability and shape memory effect have potential applications in optoelectronic devices and aerospace industries. A series of optically transparent shape memory polyimide hybrid films are synthesized from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,2 '-bis-(trifluoromethyl)biphenyl-4,4 '-diamine (TFMB) with various polyhedral oligomeric silsesquioxane (POSS) contents and then subjected to thermal imidization. The hybrid films show good optical transparency (>80% at 400 nm and >95% at 500 nm) with cutoff wavelengths ranging from 318 to 336 nm. Following the incorporation of the inorganic POSS structure, the hybrid films exhibit excellent thermal stability with glass transition temperature (T-g) ranging from 351 to 372 degrees C. The hybrid films possess the highest T-g compared with the previously-reported shape memory polymers. These findings show that POSS is successfully utilized to develop transparent polyimides with excellent thermal stability and shape memory effect.
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