The crosslinkable trifluoromethylated poly(aryl ethers) terminated with phenylethynyl moieties(11F-PAE-PEP)s were prepared in two step syntheses. The structure of 11F-PAE-PEP was confirmed by FTIR and 1H NMR. The cros...The crosslinkable trifluoromethylated poly(aryl ethers) terminated with phenylethynyl moieties(11F-PAE-PEP)s were prepared in two step syntheses. The structure of 11F-PAE-PEP was confirmed by FTIR and 1H NMR. The crosslinking behavior was studied by DSC. There is a remarkable increase of T g after crosslinking of the poly(aryl ethers). The T g values of crosslinked polymers were 437 and 446 K, respectively. The crosslinked polymers could not be soluble in common organic solvents, such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidinone, chloroform, and tetrahydrofuran. The temperatures at a 5% mass loss of the crosslinked polymers in air were above 789 K. They showed a good optical property, too. This kind of polymers will be the promising materials used as the microelectronics and optical waveguide devices.展开更多
The used perfluorosulfonic acid ion exchange membrane was treated to recycle the perfluorosulfonic acid resin. The perfluorosulfonic acid resin/silica composite catalysts were prepared by a sol gel method and characte...The used perfluorosulfonic acid ion exchange membrane was treated to recycle the perfluorosulfonic acid resin. The perfluorosulfonic acid resin/silica composite catalysts were prepared by a sol gel method and characterized by FTIR, TG, BET measurements. The composite catalysts obtained were used in esterification of HAc and butyl alcohol. The results showed that at n (HAc)∶ n (butyl alcohol)= 1 3∶1 0 , 3 g catalyst, 110 ℃ and 2 h, butyl acetate could be obtained in yield of 92 4%.展开更多
文摘The crosslinkable trifluoromethylated poly(aryl ethers) terminated with phenylethynyl moieties(11F-PAE-PEP)s were prepared in two step syntheses. The structure of 11F-PAE-PEP was confirmed by FTIR and 1H NMR. The crosslinking behavior was studied by DSC. There is a remarkable increase of T g after crosslinking of the poly(aryl ethers). The T g values of crosslinked polymers were 437 and 446 K, respectively. The crosslinked polymers could not be soluble in common organic solvents, such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidinone, chloroform, and tetrahydrofuran. The temperatures at a 5% mass loss of the crosslinked polymers in air were above 789 K. They showed a good optical property, too. This kind of polymers will be the promising materials used as the microelectronics and optical waveguide devices.
文摘The used perfluorosulfonic acid ion exchange membrane was treated to recycle the perfluorosulfonic acid resin. The perfluorosulfonic acid resin/silica composite catalysts were prepared by a sol gel method and characterized by FTIR, TG, BET measurements. The composite catalysts obtained were used in esterification of HAc and butyl alcohol. The results showed that at n (HAc)∶ n (butyl alcohol)= 1 3∶1 0 , 3 g catalyst, 110 ℃ and 2 h, butyl acetate could be obtained in yield of 92 4%.
