Poly(1,3,4-oxadiazole-ether-imide)s and their polydimethylsiloxane-containing copolymers
- 作者：Elena Hamciuc ; Corneliu Hamciuc ; Maria Cazacu
- 关键词：Poly(1 ; 3 ; 4-oxadiazole-ether-imide)s ; Polydimethylsiloxane copolymers ; Good solubility ; Thermal stability ; Fluorescence
- 刊名：European Polymer Journal
- 出版年：2007
- 期刊代码：35_00143057
- 类别：ms
- 出版时间：November 2007
- 卷：43
- 期：11
- 页码：4739-4749
- 文件大小：369 K
摘要
Poly(1,3,4-oxadiazole-ether-imide)s were prepared by thermal imidization of poly(amic-acid) intermediates resulting from the solution polycondensation reaction of a bis(ether-anhydride), namely 2,2′-bis-[(3,4-dicarboxyphenoxy)phenyl]-1,4-phenylenediisopropylidene dianhydride, with different aromatic diamines containing 1,3,4-oxadiazole ring, such as 2,5-bis(p-aminophenyl)-1,3,4-oxadiazole, 2,5-bis[p-(4-aminophenoxy)phenyl]-1,3,4-oxadiazole, 2-(4-dimethylaminophenyl)-5-(3,5-diaminophenyl)-1,3,4-oxadiazole. Poly(1,3,4-oxadiazole-ether-imide)–polydimethylsiloxane copolymers were prepared by polycondensation reaction of the same bis(ether-anhydride) with equimolar quantities of an aromatic diamine having 1,3,4-oxadiazole ring and a bis(aminopropyl)polydimethylsiloxane oligomer of controlled molecular weight. A solution imidization procedure was used to convert quantitatively the poly(amic-acid) intermediates to the corresponding polyimides. All the polymers were easily soluble in polar organic solvents such as N-methylpyrrolidone and N,N-dimethylacetamide. The polymers showed good thermal stability with decomposition temperature being above 400 °C. Solutions of some polymers in N-methylpyrrolidone exhibited blue fluorescence, having maximum emission wavelength in the range of 370–412 nm.