A new poly(aryl ether ketone) containing biphenylphthalazinone moiety was prepared by thereaction of 4-(4-hydroxybiphenyl) phthalazine-1-one with 4, 4’-difluorobenzophenone. The monomer and thepolymer were characteri...A new poly(aryl ether ketone) containing biphenylphthalazinone moiety was prepared by thereaction of 4-(4-hydroxybiphenyl) phthalazine-1-one with 4, 4’-difluorobenzophenone. The monomer and thepolymer were characterized by FT-IR and ~1H-NMR. Some properties of this polymer were described.展开更多
A new monomer, 1,4-bis(4-fluorobenzoyl) naphthalene(compound 2) was synthesized via a two-step reaction. 1,4-Naphthalenedicarboxylic acid chloride(compound 1) was prepared by using the acyl chlorization reaction...A new monomer, 1,4-bis(4-fluorobenzoyl) naphthalene(compound 2) was synthesized via a two-step reaction. 1,4-Naphthalenedicarboxylic acid chloride(compound 1) was prepared by using the acyl chlorization reaction of 1,4-naphthalenedicarboxylic acid with thionyl chloride. The Friedel-Crafts acylation of compound 1 with fluorobenzene afforded compound 2 in a 80% yield. The polycondensation of compound 2 with various bisphenols in tetramethylene sulfone(TMS) in the presence of excess potassium carbonate as a condensation reagent was carried out at 210 ℃ to quantitatively afford the corresponding poly(aryl ether ketone)s(compounds 38) containing 1,4-naphthalene moieties. Thermal analyses showed that the polymers have T g values ranging from 496 to 500 K and are thermally stable in air with initial mass loss above 500 ℃. These novel polymers exhibited an excellent solubility in organic solvents including NMP, DMAc, and chloroform, etc. In addition, the glass transition temperatures of these polymers increased and the polymers became insoluble in chloroform after treated at 260 ℃, indicating the occurrence of a thermal crosslinking reaction.展开更多
A novel series of poly(aryl ether sulfone ketone)s (PPESKs) containing phthalazinone and biphenyl moieties were prepared by two-step nucleophilic polycondensation reaction. The Mˉw values of these copolymers were bet...A novel series of poly(aryl ether sulfone ketone)s (PPESKs) containing phthalazinone and biphenyl moieties were prepared by two-step nucleophilic polycondensation reaction. The Mˉw values of these copolymers were between 38,330 and 67,900. The glass transition temperatures (Tg) and 5% decomposition temperatures were ranged in 253-269 8C and 488-500 8C, respectively, The structures of these copolymers were confirmed by FT-IR and 1H NMR. Moreover, all the resultant copolymers were amorphous determined by wide angle X-ray diffraction (WAXD).展开更多
A novel heterocyclic poly (aryl ether ketone ketone) (PPEKK) containing cyclohexenering was prepared from 1-methyl-cyclohex-1-ene-4, 5 -diyl-bis(4-chlorophenyl methanone) and 4 (4-hydroxyphenyl)(2H) phthalazin-1-one. ...A novel heterocyclic poly (aryl ether ketone ketone) (PPEKK) containing cyclohexenering was prepared from 1-methyl-cyclohex-1-ene-4, 5 -diyl-bis(4-chlorophenyl methanone) and 4 (4-hydroxyphenyl)(2H) phthalazin-1-one. The polymer was characterized by FTIR, 1HNMR, DSC,TG and X-ray analysis.展开更多
A novel soluble poly(aryl ether ketone) was prepared by the reaction of 4-(3-phenyl-4-hydr-oxyphenyl)phthalazinone with 4,4’-difluorobenzophenone. The polymer was characterized by DSC, TGA andX-ray diffraction.
Poly(aryl ether ketone) copolymers containing 2,7-naphthylene and hydroquinone(HQ) moieties with various compositions were prepared by the reaction of 4,4′-difluorobenzophenone(DFB) 2,7-naphthylene and hydroquinone i...Poly(aryl ether ketone) copolymers containing 2,7-naphthylene and hydroquinone(HQ) moieties with various compositions were prepared by the reaction of 4,4′-difluorobenzophenone(DFB) 2,7-naphthylene and hydroquinone in the presence of sodium carbonate and potassium carbonate(19∶1, mass ratio) in diphenyl sulfone(DPS). The thermal analysis results of the copolymers show that the glass transition temperatures( T_ g s ) increase, while the melting temperatures(T_ m ) and the 5.0% weight loss temperatures(T_ d ) decrease with the increase of the 2,7-naphthalene moieties. For the copolymers synthesized at a molar fraction of 2,7-naphthalene in the difluoro monomers being over 0.30, no peaks corresponding to the cold crystallization temperature and the melting temperature could be detected, indicating that these copolymers are almost amorphous. The crystal structures of the copolymers with a molar fraction of 2,7-naphthalene being less than 0.30 are rhombic.展开更多
A phosphrous-containing poly(aryl ether ketone)was synthesized derived from bisphenol-A and bis[4-(4- fluorobenzoyl)phenyl] phenyl phosphine oxide(FPPPO)by nucleophilic substitution reaction.The structure of the polym...A phosphrous-containing poly(aryl ether ketone)was synthesized derived from bisphenol-A and bis[4-(4- fluorobenzoyl)phenyl] phenyl phosphine oxide(FPPPO)by nucleophilic substitution reaction.The structure of the polymer was characterized by FT-IR,~1H-NMR and ^(31)p-NMR.The thermal property of the PAEK was measured by DSC and TGA. The glass transition temperature(T_g)of the polymer was 205℃,and the 5% weight loss temperature under nitrogen was 475℃.Good solubility of the polymer in organic solvents,such as N-methylpyrrolidone,dimethylformamide, dimethylacetamide,dimethylsulfoxide and chloroalkanes was observed,flexible film was obtained from the polymer's CH_2Cl_2 solution.The limiting oxygen index(LOI)of the PAEK was 40,which indicated that organic phosphorus moiety can offer good flame retardant property to the polymer.展开更多
A kind of novel heat-resistant, high performance engineering thermoplastic phthalazinone poly(aryl ether sulfone ketone) (PPESK) containing a carboxyl group in its side chain was prepared by the nucleophilic displacem...A kind of novel heat-resistant, high performance engineering thermoplastic phthalazinone poly(aryl ether sulfone ketone) (PPESK) containing a carboxyl group in its side chain was prepared by the nucleophilic displacement reaction of 4-(4-hydroxylphenyl)-1(2H)-phthalazinone with di(4-chlorophenyl) sulfone, 4,4'-difluoro-benzophenone and phenolphthalin in sulfolane in the presence of K2CO3 to produce high molecular weight polymers which can be dissolved in some polar solvents such as chloroform and nitrobenzene at room temperature and can be easily cast into flexible, yellowish and transparent films. PPESK is an amorphous polymer having a decomposition temperature above 400℃, which indicates that it has high thermal stability. At the same time, the thermal properties of PPESKs with dicyandiamide (DICY) as curing agent indicated that the heat-resistance properties of the PPESKs are improved after curing. The apparent activation energy (△E) of the cross-linking reaction and the reaction order (n) of PPESK/DICY were found to be 52.2 kJ/mol and ca. 1.0, respectively.Therefore, the cross-linking reaction is approximately a first order reaction.展开更多
A novel Poly (aryl ether ketone) (PPEK) containing phthalazinone and naphthalene moieties was prepared by the nucleophilic displacement reaction of 4-(4-hydroxyphenyl) (2H) phthalazin-l-one with 1-chloro-4-(4-chlorobe...A novel Poly (aryl ether ketone) (PPEK) containing phthalazinone and naphthalene moieties was prepared by the nucleophilic displacement reaction of 4-(4-hydroxyphenyl) (2H) phthalazin-l-one with 1-chloro-4-(4-chlorobenzoyl ) naphtha lene. The polymer was characterized by FTIR, ’H-NMR, DSC, TGA and WAXD.展开更多
Soluble reactive copoly (aryl ether ketone ketone) was synthesized from the condensation of 2,2’,3,3’,6,6’-hexaphenyl-4,4’-diphenol, 2,2-p-hydroxyphenyl-iso-propane, and 1-methyl-cyclohex-1-ene-4,5-diyl-bis (4-flu...Soluble reactive copoly (aryl ether ketone ketone) was synthesized from the condensation of 2,2’,3,3’,6,6’-hexaphenyl-4,4’-diphenol, 2,2-p-hydroxyphenyl-iso-propane, and 1-methyl-cyclohex-1-ene-4,5-diyl-bis (4-fluorophenyl methanone). FT-IR, DSC and TGA were used to characterize the novel polymer.展开更多
The rheometrics ARES rheometer was applied to determining the rheological behavior of a thermotropic liquid crystalline poly (aryl ether ketone). The viscosity of the material decreases with increasing temperature, re...The rheometrics ARES rheometer was applied to determining the rheological behavior of a thermotropic liquid crystalline poly (aryl ether ketone). The viscosity of the material decreases with increasing temperature, reaching a minimum in the nematic state, then slightly increases with further raising the temperature in the biphase.展开更多
1 Introduction High performance polymers have received con-siderable attention over the past decade owing to their increased demands as replacements for metals
A new monomer of 4, 4-biphenyl-bis[4-phthalazin-1(2H)-one] was synthesized from biphenyl and phthalic anhydride, and a novel copoly(aryl ether ketone) (PPEK) was synthesized from 2, 2-bis(4-hydroxyphenyl)-propane (BPA...A new monomer of 4, 4-biphenyl-bis[4-phthalazin-1(2H)-one] was synthesized from biphenyl and phthalic anhydride, and a novel copoly(aryl ether ketone) (PPEK) was synthesized from 2, 2-bis(4-hydroxyphenyl)-propane (BPA), 4, 4’-biphenyl-bis-[4-phthalazin-1(2H)-one], 4, 4- difluorodiphenylketone (DFK). The monomer and copolymer were characterized by FT-IR and 1H-NMR. DSC and TGA were used to the novel polymer.展开更多
A new poly (aryl ether ketone) was successfully synthesized by nucleophilic substitutionof bis-l, 4-(4-chlorobenzoyl) benzene (BCBB) by 1, 2 - dihydro-4 -(4-hydroxy phenyl) (2H)-phthalazin-1-one (DHPZ) in appropriate ...A new poly (aryl ether ketone) was successfully synthesized by nucleophilic substitutionof bis-l, 4-(4-chlorobenzoyl) benzene (BCBB) by 1, 2 - dihydro-4 -(4-hydroxy phenyl) (2H)-phthalazin-1-one (DHPZ) in appropriate condition. The polymer was characterized by FT-IR, 1HMR, DSC and TGA etc.展开更多
A sulfonated poly(ether ether ketone)(SPEEK) membrane with a fairly high degree of sulfonation(DS) can swell excessively and even dissolve at high temperature.To solve these problems,insolvable functionalized silica p...A sulfonated poly(ether ether ketone)(SPEEK) membrane with a fairly high degree of sulfonation(DS) can swell excessively and even dissolve at high temperature.To solve these problems,insolvable functionalized silica powder with sulfonic acid groups(SiOx-S) was added into the SPEEK matrix(DS = 55.1%) to prepare SPEEK/SiOx-S composite membranes.The decrease in both the swelling degree and the methanol permeability of the membranes was a dose-dependent result of addition of the SiOx-S powder.Pure SPEEK membrane swelled 52.6% at 80°C,whereas the SPEEK/SiOx-S(15%,by mass) membrane swelled only 27.3% at the same temperature.From room temperature to 80℃,all SPEEK/SPEEK/SiOx-S composite membranes had methanol permeability of about o ne order of magnitude lower than that of Nafion?115.Compared with pure SPEEK membranes,the addition of the SiOx-S powder not only leads to higher proton conductivity,but also increases the dimensional stability at higher temperatures,and greater proton conductivity can be achieved at higher temperature.The SPEEK/SiOx-S(20%,by mass) membrane could withstand temperature up to 145°C,at which in 100% relative humidity(RH) its proton conductivity exceeded slightly that of Nafion?115 membrane and reached 0.17 S·cm-1,while pure SPEEK membrane dissolved at 90°C.The SPEEK/SiOx-S composite membranes are promising for use in direct methanol fuel cells because of their good dimensional stability,high proton conductivity,and low methanol permeability.展开更多
Photo-grafting of hydrophilic monomer was used to enhance the hydrophilicity of poly(ether ether ketone) (PEEK) with the aim of extending its applications to biological fields. PEEK sheets were surface modified by gra...Photo-grafting of hydrophilic monomer was used to enhance the hydrophilicity of poly(ether ether ketone) (PEEK) with the aim of extending its applications to biological fields. PEEK sheets were surface modified by grafting of acrylamide(AAm) with ultraviolet(UV) irradiation in the presence or absence of benzophenone(BP). The effects of BP, irradiation time and monomer concentration on the surface wettability of PEEK were investigated. Characteriza tion of modified PEEK using scanning electron microscopy(SEM), energy-disperse spectrometer(EDS) and water contact angle measurements shows that AAm was successfully grafted on PEEK surface both in presence and absence of BP. With the increase in irradiation time and monomer concentration, contact angles decrease to as low as 30°, demonstrating a significant improvement of surface hydrophilicity. In agreement with the decrease in contact angle, under identical conditions, the nitrogen concentration increases, suggesting the increase in grafting degree of the grafting polymerization. This investigation demonstrates a self-initiation of PEEK due to its BP-like structure in the backbone of the polymer. Though the graft polymerization proceeds more readily in the presence of BP, the self-initiated graft polymerization is clearly observed.展开更多
Dihydro-4-(4-hydroxyphenyl)(2H)phthalazin-1-one(DHPZ) was sulfonated in con- centrated sulfuric acid. Poly(phthalazinone ether ketone) containing pendant sodium sulfonate group was synthesized from sulfonated and pure...Dihydro-4-(4-hydroxyphenyl)(2H)phthalazin-1-one(DHPZ) was sulfonated in con- centrated sulfuric acid. Poly(phthalazinone ether ketone) containing pendant sodium sulfonate group was synthesized from sulfonated and pure 1,2-dihydro-4-(4-hydroxyphenyl)(2H)phthalazin- 1-one, and 4,4-difluorodiphenylketone. The sulfonated monomer and sulfonated polymer were characterized with FT-IR and 1H-NMR.展开更多
基金This work was supported by the National Natural Science Foundation of China.
文摘A new poly(aryl ether ketone) containing biphenylphthalazinone moiety was prepared by thereaction of 4-(4-hydroxybiphenyl) phthalazine-1-one with 4, 4’-difluorobenzophenone. The monomer and thepolymer were characterized by FT-IR and ~1H-NMR. Some properties of this polymer were described.
基金Supported by the National Natural Science Foundation of China(No.5 0 2 0 30 0 4 )
文摘A new monomer, 1,4-bis(4-fluorobenzoyl) naphthalene(compound 2) was synthesized via a two-step reaction. 1,4-Naphthalenedicarboxylic acid chloride(compound 1) was prepared by using the acyl chlorization reaction of 1,4-naphthalenedicarboxylic acid with thionyl chloride. The Friedel-Crafts acylation of compound 1 with fluorobenzene afforded compound 2 in a 80% yield. The polycondensation of compound 2 with various bisphenols in tetramethylene sulfone(TMS) in the presence of excess potassium carbonate as a condensation reagent was carried out at 210 ℃ to quantitatively afford the corresponding poly(aryl ether ketone)s(compounds 38) containing 1,4-naphthalene moieties. Thermal analyses showed that the polymers have T g values ranging from 496 to 500 K and are thermally stable in air with initial mass loss above 500 ℃. These novel polymers exhibited an excellent solubility in organic solvents including NMP, DMAc, and chloroform, etc. In addition, the glass transition temperatures of these polymers increased and the polymers became insoluble in chloroform after treated at 260 ℃, indicating the occurrence of a thermal crosslinking reaction.
文摘A novel series of poly(aryl ether sulfone ketone)s (PPESKs) containing phthalazinone and biphenyl moieties were prepared by two-step nucleophilic polycondensation reaction. The Mˉw values of these copolymers were between 38,330 and 67,900. The glass transition temperatures (Tg) and 5% decomposition temperatures were ranged in 253-269 8C and 488-500 8C, respectively, The structures of these copolymers were confirmed by FT-IR and 1H NMR. Moreover, all the resultant copolymers were amorphous determined by wide angle X-ray diffraction (WAXD).
文摘A novel heterocyclic poly (aryl ether ketone ketone) (PPEKK) containing cyclohexenering was prepared from 1-methyl-cyclohex-1-ene-4, 5 -diyl-bis(4-chlorophenyl methanone) and 4 (4-hydroxyphenyl)(2H) phthalazin-1-one. The polymer was characterized by FTIR, 1HNMR, DSC,TG and X-ray analysis.
基金This work was supported by the National Natural Science Foundation.
文摘A novel soluble poly(aryl ether ketone) was prepared by the reaction of 4-(3-phenyl-4-hydr-oxyphenyl)phthalazinone with 4,4’-difluorobenzophenone. The polymer was characterized by DSC, TGA andX-ray diffraction.
文摘Poly(aryl ether ketone) copolymers containing 2,7-naphthylene and hydroquinone(HQ) moieties with various compositions were prepared by the reaction of 4,4′-difluorobenzophenone(DFB) 2,7-naphthylene and hydroquinone in the presence of sodium carbonate and potassium carbonate(19∶1, mass ratio) in diphenyl sulfone(DPS). The thermal analysis results of the copolymers show that the glass transition temperatures( T_ g s ) increase, while the melting temperatures(T_ m ) and the 5.0% weight loss temperatures(T_ d ) decrease with the increase of the 2,7-naphthalene moieties. For the copolymers synthesized at a molar fraction of 2,7-naphthalene in the difluoro monomers being over 0.30, no peaks corresponding to the cold crystallization temperature and the melting temperature could be detected, indicating that these copolymers are almost amorphous. The crystal structures of the copolymers with a molar fraction of 2,7-naphthalene being less than 0.30 are rhombic.
基金This work was supported by the National Natural Science Foundation of China(No.50203008).
文摘A phosphrous-containing poly(aryl ether ketone)was synthesized derived from bisphenol-A and bis[4-(4- fluorobenzoyl)phenyl] phenyl phosphine oxide(FPPPO)by nucleophilic substitution reaction.The structure of the polymer was characterized by FT-IR,~1H-NMR and ^(31)p-NMR.The thermal property of the PAEK was measured by DSC and TGA. The glass transition temperature(T_g)of the polymer was 205℃,and the 5% weight loss temperature under nitrogen was 475℃.Good solubility of the polymer in organic solvents,such as N-methylpyrrolidone,dimethylformamide, dimethylacetamide,dimethylsulfoxide and chloroalkanes was observed,flexible film was obtained from the polymer's CH_2Cl_2 solution.The limiting oxygen index(LOI)of the PAEK was 40,which indicated that organic phosphorus moiety can offer good flame retardant property to the polymer.
基金This work was supported by National Science Foundation of China (No. 20264001 ), National Science Foundation of Jiangxi Province, Innovation Fund for Technology Based Firms of China (No. 06C26213601342).
基金This project was supported by the National Ninth Five-Year-Plan Key Project "The pilot-scale production and the applied development of polyaryl ether concerning phthalazinone moiety" (No. 97-564-01-07).
文摘A kind of novel heat-resistant, high performance engineering thermoplastic phthalazinone poly(aryl ether sulfone ketone) (PPESK) containing a carboxyl group in its side chain was prepared by the nucleophilic displacement reaction of 4-(4-hydroxylphenyl)-1(2H)-phthalazinone with di(4-chlorophenyl) sulfone, 4,4'-difluoro-benzophenone and phenolphthalin in sulfolane in the presence of K2CO3 to produce high molecular weight polymers which can be dissolved in some polar solvents such as chloroform and nitrobenzene at room temperature and can be easily cast into flexible, yellowish and transparent films. PPESK is an amorphous polymer having a decomposition temperature above 400℃, which indicates that it has high thermal stability. At the same time, the thermal properties of PPESKs with dicyandiamide (DICY) as curing agent indicated that the heat-resistance properties of the PPESKs are improved after curing. The apparent activation energy (△E) of the cross-linking reaction and the reaction order (n) of PPESK/DICY were found to be 52.2 kJ/mol and ca. 1.0, respectively.Therefore, the cross-linking reaction is approximately a first order reaction.
基金Thanks to the "Ninth 5-year Plan" key project of the state.
文摘A novel Poly (aryl ether ketone) (PPEK) containing phthalazinone and naphthalene moieties was prepared by the nucleophilic displacement reaction of 4-(4-hydroxyphenyl) (2H) phthalazin-l-one with 1-chloro-4-(4-chlorobenzoyl ) naphtha lene. The polymer was characterized by FTIR, ’H-NMR, DSC, TGA and WAXD.
基金We thank the national "Ninth 5-year Plan" key project for the financial support.
文摘Soluble reactive copoly (aryl ether ketone ketone) was synthesized from the condensation of 2,2’,3,3’,6,6’-hexaphenyl-4,4’-diphenol, 2,2-p-hydroxyphenyl-iso-propane, and 1-methyl-cyclohex-1-ene-4,5-diyl-bis (4-fluorophenyl methanone). FT-IR, DSC and TGA were used to characterize the novel polymer.
基金the National Advanced Materials Committee of China (NAMCC) is gratefully acknowledged.
文摘The rheometrics ARES rheometer was applied to determining the rheological behavior of a thermotropic liquid crystalline poly (aryl ether ketone). The viscosity of the material decreases with increasing temperature, reaching a minimum in the nematic state, then slightly increases with further raising the temperature in the biphase.
基金Supported by the National High Technology Research and Development Program of China(No.2006AA03Z543).
文摘1 Introduction High performance polymers have received con-siderable attention over the past decade owing to their increased demands as replacements for metals
基金This work is sponsored by the National Natural Science Foundation of China (No. 59473901).
文摘A new monomer of 4, 4-biphenyl-bis[4-phthalazin-1(2H)-one] was synthesized from biphenyl and phthalic anhydride, and a novel copoly(aryl ether ketone) (PPEK) was synthesized from 2, 2-bis(4-hydroxyphenyl)-propane (BPA), 4, 4’-biphenyl-bis-[4-phthalazin-1(2H)-one], 4, 4- difluorodiphenylketone (DFK). The monomer and copolymer were characterized by FT-IR and 1H-NMR. DSC and TGA were used to the novel polymer.
文摘A new poly (aryl ether ketone) was successfully synthesized by nucleophilic substitutionof bis-l, 4-(4-chlorobenzoyl) benzene (BCBB) by 1, 2 - dihydro-4 -(4-hydroxy phenyl) (2H)-phthalazin-1-one (DHPZ) in appropriate condition. The polymer was characterized by FT-IR, 1HMR, DSC and TGA etc.
基金Supported by the State Key Development Program for Basic Research of China (2008CB617502), the National Natural Science Foundation of China (20606025), and Program for Changjiang Scholars and Innovative Research Team in University of China (IRT0641).
文摘A sulfonated poly(ether ether ketone)(SPEEK) membrane with a fairly high degree of sulfonation(DS) can swell excessively and even dissolve at high temperature.To solve these problems,insolvable functionalized silica powder with sulfonic acid groups(SiOx-S) was added into the SPEEK matrix(DS = 55.1%) to prepare SPEEK/SiOx-S composite membranes.The decrease in both the swelling degree and the methanol permeability of the membranes was a dose-dependent result of addition of the SiOx-S powder.Pure SPEEK membrane swelled 52.6% at 80°C,whereas the SPEEK/SiOx-S(15%,by mass) membrane swelled only 27.3% at the same temperature.From room temperature to 80℃,all SPEEK/SPEEK/SiOx-S composite membranes had methanol permeability of about o ne order of magnitude lower than that of Nafion?115.Compared with pure SPEEK membranes,the addition of the SiOx-S powder not only leads to higher proton conductivity,but also increases the dimensional stability at higher temperatures,and greater proton conductivity can be achieved at higher temperature.The SPEEK/SiOx-S(20%,by mass) membrane could withstand temperature up to 145°C,at which in 100% relative humidity(RH) its proton conductivity exceeded slightly that of Nafion?115 membrane and reached 0.17 S·cm-1,while pure SPEEK membrane dissolved at 90°C.The SPEEK/SiOx-S composite membranes are promising for use in direct methanol fuel cells because of their good dimensional stability,high proton conductivity,and low methanol permeability.
基金Supported by the Scientific and Technological Development Programs of Beijing Municipal Education Commission, China (No.KM201010011004)the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education, China, the 2011 Merit-based Research Funding for Picked Returned Overseas Scholars, Beijing Municipality, ChinaBeijing Technology and Business University Through a Research Project Approved for Undergraduates
文摘Photo-grafting of hydrophilic monomer was used to enhance the hydrophilicity of poly(ether ether ketone) (PEEK) with the aim of extending its applications to biological fields. PEEK sheets were surface modified by grafting of acrylamide(AAm) with ultraviolet(UV) irradiation in the presence or absence of benzophenone(BP). The effects of BP, irradiation time and monomer concentration on the surface wettability of PEEK were investigated. Characteriza tion of modified PEEK using scanning electron microscopy(SEM), energy-disperse spectrometer(EDS) and water contact angle measurements shows that AAm was successfully grafted on PEEK surface both in presence and absence of BP. With the increase in irradiation time and monomer concentration, contact angles decrease to as low as 30°, demonstrating a significant improvement of surface hydrophilicity. In agreement with the decrease in contact angle, under identical conditions, the nitrogen concentration increases, suggesting the increase in grafting degree of the grafting polymerization. This investigation demonstrates a self-initiation of PEEK due to its BP-like structure in the backbone of the polymer. Though the graft polymerization proceeds more readily in the presence of BP, the self-initiated graft polymerization is clearly observed.
基金the National Natural Science Foundation of China for financial support.
文摘Dihydro-4-(4-hydroxyphenyl)(2H)phthalazin-1-one(DHPZ) was sulfonated in con- centrated sulfuric acid. Poly(phthalazinone ether ketone) containing pendant sodium sulfonate group was synthesized from sulfonated and pure 1,2-dihydro-4-(4-hydroxyphenyl)(2H)phthalazin- 1-one, and 4,4-difluorodiphenylketone. The sulfonated monomer and sulfonated polymer were characterized with FT-IR and 1H-NMR.