以新型的含间甲基取代杂萘联苯结构的二胺2-(4氨-基苯基)-4-[2甲-基-4-(4氨-基苯氧基)]-2,3-二氮杂萘-1-酮为单体,与2,6萘-二甲酸经溶液缩聚反应制备新型聚芳酰胺,以4,4二-苯醚二羧酸(OBBA)为第三单体对聚芳酰胺进行共缩聚改性,并研究了OBBA的含量及结构对聚芳酰胺性能的影响。当OBBA与NDA的摩尔配比为4∶6时共聚物黏度最大为1.82 dL/g。系列聚芳酰胺具有良好的溶解性,可溶于NM P、DM A c等极性非质子溶剂,玻璃化转变温度高于310℃,5%热失重温度大于445℃。
A series of fluorinated copolyimides containing phthalazinone moieties were prepared from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride(6FDA),3,3'4,4'-benzophenone-tetracarboxylic dianhydride(BPDA)and2-(4-aminophenyl)-4-[4-(4-aminophenoxyl)phenyl]-2,3-phthalazin-1-one(DHPZ-2NH_2)for making polymeric opticalwaveguides.The resulting copolymers containing 0-50 mo1% BPDA/DHPZ-2NH_2 show good solubility and are soluble insome organic polar aprotic solvents.The copolyimides also present excellent thermal stability.These polymers possess highglass transition temperature higher than 603 K and high decomposition temperature above 742 K determined by differentialscanning calorimetry and thennogravimetric analysis,respectively,under a nitrogen atmosphere.Their refractive indicescould be controlled by varying the ratio of 6FDA and BPDA in the copolymer from 0.5 to 1.0,and the in-plane refractiveindices(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 thatthe phthalazinone-containing copolyimides could be suitable to fabricate optical waveguides possessing a low polarizationdependent loss(PDL).
