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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 2
BKCSDE 31(2)
February 20, 2010 

Synthesis and Nonlinear Optical Properties of Novel T-type Polyester Containing Thiophene with Enhanced Thermal Stability
Hyo Jin No, You Jin Cho, Ju Yeon Lee*
Nonlinear optics, Polyester, Differential scanning calorimetry, AFM, Second harmonic generation
A novel T-type polyester 7 containing 1-(2,5-dioxyphenyl)-2-{5-(1,2,2-tricyanovinyl)-2-thienyl}ethenes as nonlinear optical (NLO) chromophores, which are part of the polymer backbone, was prepared and characterized. Polyester 7 is soluble in common organic solvents such as dimethylsulfoxide and N,N-dimethylformamide. It showed a thermal stability up to 300 oC in thermogravimetric analysis thermogram and the glass-transition temperature (Tg) obtained from differential scanning calorimetry thermogram was around 113 oC. The second harmonic generation (SHG) coefficient (d33) of poled polymer films at 1,560 nm fundamental wavelength was around 1.85 pm/V. The dipole alignment exhibits a greater thermal stability even at 10 oC higher than Tg, and there is no SHG decay below 125 oC due to the partial mainchain character of the polymer structure, which is acceptable for nonlinear optical device applications.
429 - 434
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