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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 30, Number 3
BKCSDE 30(3)
March 20, 2009 

Synthesis and Properties of Novel Y-type Nonlinear Optical Polyester Containing Cyanovinylthiophene with Enhanced Thermal Stability of Second Harmonic Generation
Ga Young Lee, Jin Hyang Kim, Han Na Jang, Dong Seon Won, Hyo Jin No, Ju Yeon Lee*, Bum Ku Rhee, Hee Dok Choi
NLO, Polyester, Differential scanning calorimetry (DSC), Atomic force microscopy (AFM), Second harmonic generation (SHG)
1-{2,4-Di-(2-hydroxyethoxy)phenyl}-2-(2-thienyl)ethene (5) was prepared and condensed with terephthaloyl chloride to yield polyester (6). Polymer 6 was reacted with tetracyanoethylene to give novel Y-type polyester (7) containing 1-(2,4-dioxyethoxy)phenyl-2-{5-(2,2,3-tricyanovinyl)-2-thienyl)}ethenyl groups as NLO-chromophores, which are parts the polymer backbones. Polymer 7 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. It showed thermal stability up to 300℃ in thermogravimetric analysis with glasstransition temperature obtained from differential scanning calorimetry near 134℃. The second harmonic generation (SHG) coefficient (d33) of poled polymer film at the 1560 nm fundamental wavelength was around 6.74 x 10-9 esu. The dipole alignment exhibited high thermal stability up to the glass-transition temperature (Tg), and there was no SHG decay below 135 oC because of the partial main-chain character of polymer structure, which is acceptable for NLO device applications.
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