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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 5
BKCSDE 29(5)
May 20, 2008 

 
Title
Synthesis of Novel Y-type Nonlinear Optical Polyesters with Enhanced Thermal Stability of Dipole Alignment
Author
Han-Na Jang, Ju-Yeon Lee*
Keywords
Nonlinear optics, Polyester, AFM, Second harmonic generation, Dipole alignment
Abstract
2,4-Di-(2'-hydroxyethoxy)benzylidenemalononitrile (3) was prepared and polymerized with terephthaloyl chloride and adipoyl chloride to yield novel Y-type polyesters 4 and 5 containing dioxybenzylidenemalononitrile groups as NLO-chromophores, which constituted parts of the polymer backbone. The resulting polymers 4 and 5 are soluble in common organic solvents such as acetone and N,N-dimethylformamide. Polymers 4 and 5 showed thermal stability up to 300 oC in thermogravimetric analysis with glass-transition temperatures obtained from differential scanning calorimetry in the range 83-94 oC. The second harmonic generation (SHG) coefficients (d33) of poled polymer films at the 1064 nm fundamental wavelength were around 6.48 × 10?9 esu. The dipole alignment exhibited high thermal stability even at 10 oC higher than Tg and no significant SHG decay was observed below 105 oC partially due to the main-chain character of polymer structure, which is acceptable for NLO device applications.
Page
933 - 938
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