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|標題:||Sequential self-repetitive reaction toward wholly aromatic polyimides with highly stable optical nonlinearity||作者:||Lin, H.L.
|Project:||Polymer Chemistry||期刊/報告no：:||Polymer Chemistry, Volume 2, Issue 3, Page(s) 685-693.||摘要:||
A sequential self-repetitive reaction (SSRR) based on carbodiimide (CDI) chemistry was utilized for preparing a high-yield wholly aromatic polyimide. The polyimide was synthesized with 4,4'-methylene-diphenylisocyanate (MDI) and a di(acid-ester) compound which was derived from the ring-opening reaction of 3,3',4,4'-oxydiphthalic dianhydride (ODPA) at room temperature by the addition of equimolar methanol. Poly-CDI was first synthesized from MDI. The di(acid-ester) compound was then reacted with poly-CDI to form poly(N-acylurea). After curing process, N-acylurea moiety was converted to di(ester-amide) structure via SSRR and further subjected to a ring-closure reaction to form the wholly aromatic polyimide with a T-g of 247 degrees C. This approach was further taken to prepare thermally stable nonlinear optical (NLO) materials. Similarly a diimide-diacid containing chromophore was reacted with poly-CDI to obtain an intermediate, poly(N-acylurea). The poly(N-acylurea) with the ester side groups would exhibit excellent organosolubility, which enabled the fabrication of high quality optical thin films. After in situ poling and curing processes, N-acylurea moiety was converted to di(ester-amide) structure via SSRR and further subjected to a ring-closure reaction to form the wholly aromatic NLO polyimide with an electro-optical coefficient, r(33) of 25 pm/V (830 nm). Excellent temporal stability at elevated temperatures (200 degrees C) and a waveguide optical loss of 2.5 dB cm(-1) at 1310 nm were also obtained.
|Appears in Collections:||化學工程學系所|
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