A novel unsymmetrical dianhydride containing 4\|(4\|hydroxylphenyl)\|2,3\|phthalazin\|1\|one was synthesized in order to improve the solubility of aromatic polyimides according to the principle of designing new monome...A novel unsymmetrical dianhydride containing 4\|(4\|hydroxylphenyl)\|2,3\|phthalazin\|1\|one was synthesized in order to improve the solubility of aromatic polyimides according to the principle of designing new monomers.This article reported a series of polyimide random copolymers derived from 4,4′ diamino diphenyl sulfone (DAPS),4,4′ oxyl dianiline (ODA) and the new dianhydride\|2 (3,4 dicarboxyl phenyl) 4 (3′,4′ dicarboxyl phenyl oxyl) phenyl 2,3 phthalazine 1 one dianhydride (DAH4) by“one step”solution polycondensation in m cresol with catalystic amount of isoquinoline at 200℃.Some properties of the copolymers were investigated by DSC,TG and mechanical analysis.The result shows that the η inh of copolymers is between 0 64 to 0 71 dL/g in m cresol at 25℃,and the T g of the copolymers are higher than that of pure poliymides containing 4,4′ oxyl dianiline (polymer 5).The relationship between T g and mole percent of DAPS is not obvious.Degradation temperature for 5% weight loss ( T d5 ) of the copolymers occurs all above 470℃ in air.The mechanical properties of the copolymers are lower owing to introducing sulfone groups into polymer’s backbone.In sharp contrast,the copolymers have good solubility and can be easily soluble in 1,1,2,2 tetrachloroethane(TCE), N,N dimethylacetamide(DMAc), N methyl 2 pyrrolidinone (NMP), m cresol and pyridine.Furthermore,the copolymers have better solubility in dimethyl sulfoxide (DMSO) and chloroform than the polyimide derived from DAH4 and ODA.展开更多
A novel poly(ether imide)s containing phthalazinone and isopropyl moieties derived from 2-(4-aminophenyl)-4-[4-(4-aminophenoxy)phenyl]-phthalazin-1-one and bisphenol-A diphthalic anhydride was synthesized by one-step ...A novel poly(ether imide)s containing phthalazinone and isopropyl moieties derived from 2-(4-aminophenyl)-4-[4-(4-aminophenoxy)phenyl]-phthalazin-1-one and bisphenol-A diphthalic anhydride was synthesized by one-step solution condensation polymerization in nr-cresol. The polymer was characterized by FTIR, NMR, molecular weights, glass transition temperature, thermal degradation temperature and WAXD.展开更多
To date, it is still a great challenge for highly efficient perovskite devices to realize the high quality per- ovskite films with high purity, high coverage ratio and good crystallization by two-step scalable solutio...To date, it is still a great challenge for highly efficient perovskite devices to realize the high quality per- ovskite films with high purity, high coverage ratio and good crystallization by two-step scalable solution method. In this study, a series PbI2 films with tunable micro-architecture of Pbl2 crystals are prepared via solution processable crystal engineering. The perovskite film, prepared by optimized pit spacing in gas pumped PbI2 film at 1000 Pa, shows the highest film quality, including no residual Pbl2 phase, compact morphology, and improved photoluminescence intensity. A transformation kinetics shows that the pit spacing strongly influences both the mass transfer and the sequential intercalation reaction between CH3NH31 and PbI2 crystals, which ultimately determines the full reaction state of the perovskite film. The perovskite solar cells assembled by the perovskite film show both high power-conversion efficiency and good reproducibility of photovoltaic performance due to the restrained charge recombination arising from the high quality perovskite film.展开更多
文摘A novel unsymmetrical dianhydride containing 4\|(4\|hydroxylphenyl)\|2,3\|phthalazin\|1\|one was synthesized in order to improve the solubility of aromatic polyimides according to the principle of designing new monomers.This article reported a series of polyimide random copolymers derived from 4,4′ diamino diphenyl sulfone (DAPS),4,4′ oxyl dianiline (ODA) and the new dianhydride\|2 (3,4 dicarboxyl phenyl) 4 (3′,4′ dicarboxyl phenyl oxyl) phenyl 2,3 phthalazine 1 one dianhydride (DAH4) by“one step”solution polycondensation in m cresol with catalystic amount of isoquinoline at 200℃.Some properties of the copolymers were investigated by DSC,TG and mechanical analysis.The result shows that the η inh of copolymers is between 0 64 to 0 71 dL/g in m cresol at 25℃,and the T g of the copolymers are higher than that of pure poliymides containing 4,4′ oxyl dianiline (polymer 5).The relationship between T g and mole percent of DAPS is not obvious.Degradation temperature for 5% weight loss ( T d5 ) of the copolymers occurs all above 470℃ in air.The mechanical properties of the copolymers are lower owing to introducing sulfone groups into polymer’s backbone.In sharp contrast,the copolymers have good solubility and can be easily soluble in 1,1,2,2 tetrachloroethane(TCE), N,N dimethylacetamide(DMAc), N methyl 2 pyrrolidinone (NMP), m cresol and pyridine.Furthermore,the copolymers have better solubility in dimethyl sulfoxide (DMSO) and chloroform than the polyimide derived from DAH4 and ODA.
文摘A novel poly(ether imide)s containing phthalazinone and isopropyl moieties derived from 2-(4-aminophenyl)-4-[4-(4-aminophenoxy)phenyl]-phthalazin-1-one and bisphenol-A diphthalic anhydride was synthesized by one-step solution condensation polymerization in nr-cresol. The polymer was characterized by FTIR, NMR, molecular weights, glass transition temperature, thermal degradation temperature and WAXD.
基金financial support from the National Program for Support of Top-notch Young Professionals
文摘To date, it is still a great challenge for highly efficient perovskite devices to realize the high quality per- ovskite films with high purity, high coverage ratio and good crystallization by two-step scalable solution method. In this study, a series PbI2 films with tunable micro-architecture of Pbl2 crystals are prepared via solution processable crystal engineering. The perovskite film, prepared by optimized pit spacing in gas pumped PbI2 film at 1000 Pa, shows the highest film quality, including no residual Pbl2 phase, compact morphology, and improved photoluminescence intensity. A transformation kinetics shows that the pit spacing strongly influences both the mass transfer and the sequential intercalation reaction between CH3NH31 and PbI2 crystals, which ultimately determines the full reaction state of the perovskite film. The perovskite solar cells assembled by the perovskite film show both high power-conversion efficiency and good reproducibility of photovoltaic performance due to the restrained charge recombination arising from the high quality perovskite film.
