Poly(aryl ether ether ketone ketone)(PEEKK) is a kind important high-performance polymers due to their excellent thermal stability a nd other outstanding properties similar to PEEK and PEKK.However,the PEEKK’s ins ol...Poly(aryl ether ether ketone ketone)(PEEKK) is a kind important high-performance polymers due to their excellent thermal stability a nd other outstanding properties similar to PEEK and PEKK.However,the PEEKK’s ins olubility in common solutions and high melt point restrict its processing and ap plications.In this paper,a series of random copolymers composed of poly(aryl eth er ether ketone ketone)(PEEKK)/poly(aryl ether ketone ether ketone ketone) cont a ining bis(o-metheyl) moiety(DM-PEKEKK) were prepared by low temperatur e so lution polycondensation of 4,4′-bis(2,6-dimethylphenoxy)diphenylketone (o -M 2DPOBP),1,4-dipheoxylbenzene(DPB) and terephthaloyl chlorde(TPC) in 1,2 -dichloroethane with the presence of AlCl 3 and DMF. The copolymers were chara cterized by FT-IR,DSC,WAXD,TGA,etc.The results show that glass transitio n te mperature increases greatly with the increasing of the ratio of o-M 2DPOBP /DPB,while melting temperature and crystallinity of copolymers decrease.The solu bility of the copolymers is improved greatly,while the copolymers still exhibit excellent thermostability.展开更多
A poly(N-isopropylacrylamide)/β-Cyclodextr in (PNIPAM/β-CD) ionic polymer was synthesized by the reaction of poly( N-isopropylacrylamide-co-acryl acid) (poly(NIPAM-co-AA) with mo no-6-ethanolamine-β-cyclodextrin (E...A poly(N-isopropylacrylamide)/β-Cyclodextr in (PNIPAM/β-CD) ionic polymer was synthesized by the reaction of poly( N-isopropylacrylamide-co-acryl acid) (poly(NIPAM-co-AA) with mo no-6-ethanolamine-β-cyclodextrin (EAA-β-CD).EAA-β-CD was synthesized via the reaction of mono-6-OTs-β-CD(Ts= p-toluensulfo nyl) with E.The ionic polymer was characterized by means of FT-IR and UV-V isi ble spectroscopes,and DSC.The result shows that the formation of ionic interacti on between poly(NIPAM-co-) and E-β-CD leads to an increase of t he glass transition temperature (T g) of poly(NIPAM-co-).In additio n,not only the ionic polymer exhibits a well-defined lower critical solution te mperature (LCST),but also β-CD on the polymer backbone can be modulated by changing the pH values,as compared with β-CD-conjugated polymers with co valent bonds.Also,β-CD can easily be bound to the polymer backbone in form of free,or inclusion complex.It is expected that the polymer may find some usef ul applications such as drug delivery system.展开更多
文摘Poly(aryl ether ether ketone ketone)(PEEKK) is a kind important high-performance polymers due to their excellent thermal stability a nd other outstanding properties similar to PEEK and PEKK.However,the PEEKK’s ins olubility in common solutions and high melt point restrict its processing and ap plications.In this paper,a series of random copolymers composed of poly(aryl eth er ether ketone ketone)(PEEKK)/poly(aryl ether ketone ether ketone ketone) cont a ining bis(o-metheyl) moiety(DM-PEKEKK) were prepared by low temperatur e so lution polycondensation of 4,4′-bis(2,6-dimethylphenoxy)diphenylketone (o -M 2DPOBP),1,4-dipheoxylbenzene(DPB) and terephthaloyl chlorde(TPC) in 1,2 -dichloroethane with the presence of AlCl 3 and DMF. The copolymers were chara cterized by FT-IR,DSC,WAXD,TGA,etc.The results show that glass transitio n te mperature increases greatly with the increasing of the ratio of o-M 2DPOBP /DPB,while melting temperature and crystallinity of copolymers decrease.The solu bility of the copolymers is improved greatly,while the copolymers still exhibit excellent thermostability.
文摘A poly(N-isopropylacrylamide)/β-Cyclodextr in (PNIPAM/β-CD) ionic polymer was synthesized by the reaction of poly( N-isopropylacrylamide-co-acryl acid) (poly(NIPAM-co-AA) with mo no-6-ethanolamine-β-cyclodextrin (EAA-β-CD).EAA-β-CD was synthesized via the reaction of mono-6-OTs-β-CD(Ts= p-toluensulfo nyl) with E.The ionic polymer was characterized by means of FT-IR and UV-V isi ble spectroscopes,and DSC.The result shows that the formation of ionic interacti on between poly(NIPAM-co-) and E-β-CD leads to an increase of t he glass transition temperature (T g) of poly(NIPAM-co-).In additio n,not only the ionic polymer exhibits a well-defined lower critical solution te mperature (LCST),but also β-CD on the polymer backbone can be modulated by changing the pH values,as compared with β-CD-conjugated polymers with co valent bonds.Also,β-CD can easily be bound to the polymer backbone in form of free,or inclusion complex.It is expected that the polymer may find some usef ul applications such as drug delivery system.
