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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 22, Number 7
BKCSDE 22(7)
July 20, 2001 

Synthesis of Novel Polyurethanes Containing Tricyanocyclopropyl Group as a Piezoelectric Chromophore and Their Properties
Ju-Yeon Lee, Eun-Ju Park
1-(2',2',3'-Tricyano-3-carbomethoxycyclopropyl)-3,4-di-(2'-hydroxyethoxy)benzene (4) was prepared by the reaction of bromomalononitrile with methyl 3,4-di-(2'-hydroxyethoxy)benzylidenecyanoacetate (3). Diol 4 was condensed with tolylene-2,4-diisocyanate, 3,3'-dimethoxy-4,4'-biphenylenediisocyanate, and 1,6-hexamethylenediisocyanate to yield polyurethanes 5, 6, and 7 containing tricyanocyclopropane functionalities in the pendant group. The resulting polymers 5-7 were soluble in common organic solvents and the inherent viscosities were in the range of 0.25-0.30 dL/g. Polyurethanes 5-7 showed a thermal stability up to 300 ℃ in TGA thermograms. Solution-cast films showed Tg values in the range of 100-125 ℃ and piezoelectric coeffcients (d31) of the poled polymer films were 1.3-2.0 pC/N, which are acceptable for piezoelectric device applications.
753 - 757
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