Soluble Polyimides with Polyalicyclic Structure. Part 9. A Polyalicyclic Polyimide Bearing Spiro Structure

Autor:	Yasumasa Maeda, Toshihiko Matsumoto, Naoyuki Takeshima
Rok vydání:	2000
Předmět:	Condensation polymer Materials science Polymers and Plastics Organic Chemistry Inherent viscosity Dielectric chemistry.chemical_compound Polymerization chemistry Polymer chemistry Materials Chemistry Thermal stability Composite material Benzene Refractive index Polyimide
Zdroj:	Journal of Photopolymer Science and Technology. 13:327-332
ISSN:	1349-6336 0914-9244
Popis:	A novel polyalicyclic tetracarboxylic dianhydride, bicyclo[2.2.1]heptane-2-exo, 3-exo, 5-exo-tricarboxyl-5-endo-acetic 2, 3:5, 5-dianhydride was synthesized and the polycondensation of the dianhydride with 1, 3-bis(4-aminophenoxy)benzene was carried out in well-purified N, N-dimethylacetamide (DMAc) at 140°C under N2. An inherent viscosity (ηinh) measured using a 0.5g/dL DMAc solution of the polyimide at 30°C was 0.33dL/g. The polymerization solution gave a flexible and tough film after being cast on a glass plate and then cured. The polyimide film was soluble in aprotic polar solvents such as DMAc and N-methyl-2-pyrrolidone at room temperature. The polyimide showed good thermal stability and the 5% weight loss temperature in N2 was 490°C. The polyimide film exhibited a Tg at 227°C. The cutoff at wavelengths was around 290nm and the film was colorless. The transparency in the visible region (400-780nm) was over 85%. The flexible polyimide possessed an average refractive index of 1.611, and the optical anisotropy, the difference between in-plane and out-of-plane refractive indices, was 0.015. The dielectric constant that was estimated from the refractive index according to the modified Maxwell's equation was 2.85.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a1aba0d793ecd557b5db410944d356dc https://doi.org/10.2494/photopolymer.13.327 Zobrazit plný text záznamu