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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 6
BKCSDE 31(6)
June 20, 2010 

Synthesis of Novel Y-type Nonlinear Optical Polyester with Enhanced Thermal Stability of Second Harmonic Generation for Electro-Optic Applications
You Jin Cho, Ju Suk Lee, Ju Yeon Lee*
Nonlinear optics, Polyester, AFM, Second harmonic generation, Dipole alignment
Methyl 3,4-di-(2’-hydroxyethoxy)benzylidenecyanoacetate (3) was prepared and condensed with terephthaloyl chloride to yield novel Y-type polyester (4) containing 3,4-dioxybenzylidenecyanoacetate groups as NLO-chromophores, which constituted parts of the polymer main chains. The resulting polymer 4 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. Polymer 4 shows thermal stability up to 280 oC in thermogravimetric analysis with glass-transition temperature obtained from differential scanning calorimetry near 105 oC. The second harmonic generation (SHG) coefficient (d33) of poled polymer films at the 1064 nm fundamental wavelength is around 2.42 pm/V. The dipole alignment exhibits high thermal stability up to near Tg, and there is no SHG decay below 100 oC due to the partial main-chain character of polymer structure, which is acceptable for NLO device applications.
1509 - 1514
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