: : : 98.05.05

* Polyimides with main-chain photosensitive groups: Synthesis,characterization and their properties as liquid crystal alignment layers

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* - *-

* Photo-decomposition

Photo-isomerization (cis-trans transition)

* Photo-dimerization

*DOCDA ------- (5-(2,5-dioxotetrahydrofuryl)-3-methyl-3-cyclohexene-1,2-dicarboxylic anhydride) 5-(2,5-)-3--3--1,2-

DAP ------- 2,4-diaminophenol 2,4-

Chalcone derivatives ------- (n=3: DC3, n=8: DC8, n=16: DC16)

*m-cresol - -------

NMP N - -------

isoquinoline (5 wt%) -------

ZLI-3449 -------

*DAP(5 wt%)-DOCDAPI - polyimide- polyimide

*ITO

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* UV-vis---(n=16)275 350nm

*UV-vis---- polyimide(b)365nm-(a)254nm

* 10o 360oDC-3 DC-16

* DC-3 12DC-1689.52

*Conoscopical picture

*Conoscopical pictureDC-16

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PIUV-vis-

DC-3DC-16

DC-3 12DC-1689.52

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*PI PIWilliamson PI2000C40PI50nm

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* I R ---PIC=C1600cm-12950cm-1

* IR---LPUVPI

1245 cm-1C=CLPUV

* PI

*5(a)PI300-400nmPI

5(b)PImax =340 nm

UV-vis--- PI

* PI

(n=3)1O(n=16)89O

PI

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