Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/41121
標題: Sequential self-repetitive reaction toward wholly aromatic polyimides with highly stable optical nonlinearity
作者: Lin, H.L.
李榮和
Juang, T.Y.
Chan, L.H.
Lee, R.H.
Dai, S.H.A.
Liu, Y.L.
Su, W.C.
Jeng, R.J.
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.
URI: http://hdl.handle.net/11455/41121
ISSN: 1759-9954
DOI: 10.1039/c0py00157k
Appears in Collections:化學工程學系所

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