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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

Title	Synthesis of Novel Y-type Nonlinear Optical Polyester with Enhanced Thermal Stability of Second Harmonic Generation for Electro-Optic Applications
Author	You Jin Cho, Ju Suk Lee, Ju Yeon Lee*
Keywords	Nonlinear optics, Polyester, AFM, Second harmonic generation, Dipole alignment
Abstract	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 T_g, 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.
Page	1509 - 1514
Full Text	PDF

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