Aimed at making high-performance coatings,the UV-crosslinking behavior of bisphenol A-type poly(ether ether ketone) were studied. A homogeneous aqueous dispersion of this soluble poly(ether ether ketone) was successfu...Aimed at making high-performance coatings,the UV-crosslinking behavior of bisphenol A-type poly(ether ether ketone) were studied. A homogeneous aqueous dispersion of this soluble poly(ether ether ketone) was successfully obtained through polymer emulsion formation and then the solvent evaporation. The uniform particles(～150 nm) could be formed when mass fraction of the polymer in chloroform was ranged from 3% to 25%. The coating could be prepared via spray-coating method from above concentrated aqueous dispersion and some processing aids. We found the UV crosslinked layers had better hardness,adhesions and solvent-resistance than the ones without UV irradiation.展开更多
Six highly fluorinated poly(arylene ether)s were prepared by using a nucleophilic polycondensationreaction and their sulfonation selectivity was investigated.Single site of each repeated unit on pendant phenylgroup co...Six highly fluorinated poly(arylene ether)s were prepared by using a nucleophilic polycondensationreaction and their sulfonation selectivity was investigated.Single site of each repeated unit on pendant phenylgroup could be obtainedviathe postsulfonation approach under mild reaction conditions.Phenylated fluorina-ted poly(arylene ether)(Ph-FPAE) showed more excellent controllability over substituted sites and sulfonationdegree when chlorosulfonic acid was used as sulfonation reagent.The resulting sulfonated Ph-FPAE(Ph-SF-PAE) exhibited good thermal stability,solubility and hot-water dimensional stability,and also had a protonconductivity of 0.10 S/cm at 100℃.The results showed that Ph-SFPAE might be a candidate material forproton exchange membrane in fuel cell applications.展开更多
A novel aromatic polyethersulfone bearing a(3-methoxy)phenyl group(PPES-OMe)was synthesized via an aromatic nucleophilic substitution reaction.A hydroxyl-containing polyethersulfone(PPES-OH)was successfully obtained v...A novel aromatic polyethersulfone bearing a(3-methoxy)phenyl group(PPES-OMe)was synthesized via an aromatic nucleophilic substitution reaction.A hydroxyl-containing polyethersulfone(PPES-OH)was successfully obtained via a demethylation reaction of PPES-OMe.A series of nano-hybrid materials could be prepared with sol-gel method and FTIR results suggested the chemical bond formed between the hydroxyl group of PPES-OH and TEOS.Nano-size SiO2 particles were observed to disperse uniformly in the polyethersulfone matrix by SEM.It was found that all the films based on these materials were flexible.展开更多
文摘Aimed at making high-performance coatings,the UV-crosslinking behavior of bisphenol A-type poly(ether ether ketone) were studied. A homogeneous aqueous dispersion of this soluble poly(ether ether ketone) was successfully obtained through polymer emulsion formation and then the solvent evaporation. The uniform particles(～150 nm) could be formed when mass fraction of the polymer in chloroform was ranged from 3% to 25%. The coating could be prepared via spray-coating method from above concentrated aqueous dispersion and some processing aids. We found the UV crosslinked layers had better hardness,adhesions and solvent-resistance than the ones without UV irradiation.
文摘Six highly fluorinated poly(arylene ether)s were prepared by using a nucleophilic polycondensationreaction and their sulfonation selectivity was investigated.Single site of each repeated unit on pendant phenylgroup could be obtainedviathe postsulfonation approach under mild reaction conditions.Phenylated fluorina-ted poly(arylene ether)(Ph-FPAE) showed more excellent controllability over substituted sites and sulfonationdegree when chlorosulfonic acid was used as sulfonation reagent.The resulting sulfonated Ph-FPAE(Ph-SF-PAE) exhibited good thermal stability,solubility and hot-water dimensional stability,and also had a protonconductivity of 0.10 S/cm at 100℃.The results showed that Ph-SFPAE might be a candidate material forproton exchange membrane in fuel cell applications.
文摘A novel aromatic polyethersulfone bearing a(3-methoxy)phenyl group(PPES-OMe)was synthesized via an aromatic nucleophilic substitution reaction.A hydroxyl-containing polyethersulfone(PPES-OH)was successfully obtained via a demethylation reaction of PPES-OMe.A series of nano-hybrid materials could be prepared with sol-gel method and FTIR results suggested the chemical bond formed between the hydroxyl group of PPES-OH and TEOS.Nano-size SiO2 particles were observed to disperse uniformly in the polyethersulfone matrix by SEM.It was found that all the films based on these materials were flexible.
