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Indexed by:期刊论文

Date of Publication:2005-01-01

Journal:CHINESE JOURNAL OF POLYMER SCIENCE

Included Journals:Scopus、SCIE、EI、ISTIC

Volume:23

Issue:1

Page Number:71-74

ISSN No.:0256-7679

Key Words:polymeric optical waveguides; fluorinated polyimides; phthalazinone

Abstract:A series of fluorinated copolyimides containing phthalazinone moieties were prepared from 2,2-bis(3,4dicarboxypheiiyl)hexafluoropropane dianhydride (6FDA), 3,3'4,4'-benzophenone-tetracarboxylic dianhydride (BPDA) and 2-(4-aminophenyl)-4-[4-(4-aminophenoxyl)phenyl]-2,3-phthalazin-1-one (DHPZ-2NH(2)) for making polymeric optical waveguides. The resulting copolymers containing 0-50 mol% BPDA/ DHPZ-2NH(2) show good solubility and are soluble in some organic polar aprotic solvents. The copolyimides also present excellent thermal stability. These polymers possess high glass transition temperature higher than 603 K and high decomposition temperature above 742 K determined by differential scanning calorimetry and thermogravimetric analysis, respectively, under a nitrogen atmosphere. Their refractive indices could be controlled by varying the ratio of 6FDA and BPDA in the copolymer from 0.5 to 1.0, and the in-plane refractive indices (n(TE)) range from 1.6366 to 1.6668 and the out-of-plane refractive indices (n(TM)) from 1.6024 to 1.6280 at 632.8 nm. The polymers birefringence (0.0342-0.0388) is almost independent of the 6FDA content of copolymer, which indicated that the phthalazinone-containing copolyimides could be suitable to fabricate optical waveguides possessing a low polarization dependent loss (PDL).