The self-assembly between poly(4-diazonium styrene) (PDS) and poly(sodiumsulfonate styrene)(PSS) was investigated.The mutilayer ult ra thin films were fabricated layer-by-layer successfully from PDS and PSS.Af ter hea...The self-assembly between poly(4-diazonium styrene) (PDS) and poly(sodiumsulfonate styrene)(PSS) was investigated.The mutilayer ult ra thin films were fabricated layer-by-layer successfully from PDS and PSS.Af ter heating for 10 min at 70℃ the multilayer film became very stable towards po lar solvents.No considerable changes were observed for the heated film soaked i n DMF (20℃) for 48 h,while the unheated film almost destroyed at same conditio n.The dramatic improvement in stability of the film towards polar solvents shou ld be attributed to the conversion of bonds between the layers of the film from ionic bond to covalent bond under heating.Y(4 DIAZONIUMSTYRENE)ANDPOLY(SODIUMSULFONATESTYRENE)YANGZhaohui,JIANGWei,CAOWeixiao(CollegeofChemistryandMolecularEngineering ,PekingUniversity ,Beijing 10 0 871)Abstract Theself assemblybetweenpoly( 4 diazoniumstyrene) (PDS)andpoly(sodiumsulfonatestyrene) (PSS)wasinvestigated .Themutilayerultrathinfilmswerefabricatedlayer by layersuccessfullyfromPDSandPSS .Afterheatingfor 1 0minat 70℃themultilayerfilmbecameverystabletowardspolarsolvents.NoconsiderablechangeswereobservedfortheheatedfilmsoakedinDMF ( 2 0℃ )for48h ,whiletheunheatedfilmalmostdestroyedatsamecondition.Thedramaticimprovementinstabilityofthefilmtowardspolarsolventsshouldbeattributedtotheconversionofbondsbetweenthelayersofthefilmfromionicbondtocovalentbondunderheating .Keywords Poly( 4 diazoniumstyrene) 。展开更多
Tetra(4-diazoniumbenzene)porphyrin(TDBP) was synthesized via diazo-reaction of tetra-(4-aminobenzene)porphyrin(TABP). From the analysis results of MALDI-TOF mass spectroscopy and FTIR,it was confirmed that the synthes...Tetra(4-diazoniumbenzene)porphyrin(TDBP) was synthesized via diazo-reaction of tetra-(4-aminobenzene)porphyrin(TABP). From the analysis results of MALDI-TOF mass spectroscopy and FTIR,it was confirmed that the synthesized porphyrin derivative mainly consists of tetra(4-diazoniumbenzene) porphyrin with trace tri- and di-substituted compounds. The self-assembly of TDBP with poly(styrene sulfonate)(PSS) was carried out and a novel TDBP/PSS multilayer ultrathin film on silicon substrate was obtained. The self-assembled film is very sensitive to heat and light,after heating or irradiation of UV light,the thin film becomes very stable towards polar solvents such as DMF. The coupling reaction of TDBP with phenol and the thermal stability of TDBP were also investigated preliminary. [WT5HZ]展开更多
Homopolymerization of 4-vinyl pyridine（4-VP） and copolymerization of 4-VP with styrene（St） were performed by catalyst systems composed of calix[4]arene-neodymium complex 2,di-n-butylmagnesium and hexamethyl phosph...Homopolymerization of 4-vinyl pyridine（4-VP） and copolymerization of 4-VP with styrene（St） were performed by catalyst systems composed of calix[4]arene-neodymium complex 2,di-n-butylmagnesium and hexamethyl phosphoramide. The molecular weight of P（4-VP） was greatly affected by adding calix[4]arene-neodymium complex,and high molecular weight of P（4-VP） was got by using calix[4]arene-neodymium complex.The highest molecular weight of P（4-VP） was as high as 4.65×106 obtained by using a catalyst system with 2.0×10-4?mol/L of calix[4]arene-neodymium complex,while the molecular weight of P（4-VP） was only 5.62×105 without calix[4]arene-neodymium complex. In addition,4-VP-St copolymers with different 4-VP contents were obtained in good yield.When styrene was polymerized first for a time period,and then 4-VP was added,4-VP-St copolymers with 4.85?mol%～23.3?mol% of 4-VP units were obtained,but when 4-VP and styrene were added at the same time the resultant 4-VP-St copolymers had 44.0?mol%～66.3?mol% of 4-VP units.展开更多
To obtain a novel support with practical value for metallocene catalyst(\%η\%\|C\-5H\-5)TiCl\-3(CpTiCl\-3), poly(styrene\|co\|4\|vinylpyridine)/SiO\-2 nanoscale hybrid material(SrP/SiO\-2) was firstly produced as sup...To obtain a novel support with practical value for metallocene catalyst(\%η\%\|C\-5H\-5)TiCl\-3(CpTiCl\-3), poly(styrene\|co\|4\|vinylpyridine)/SiO\-2 nanoscale hybrid material(SrP/SiO\-2) was firstly produced as support. After pretreatment by methylaluminoxane(MAO), the hybrid materials reacted with CpTiCl\-3. The results from SAXS, SEM and TEM indicated the morphology and structure of organic/inorganic hybrid materials, and the size of inorganic particle in hybrid was nanoscale. The results from IR and XPS showed that there were two possible cationic active species in the hybrid\|supported catalyst, the polymerization results of styrene proved this possibility.展开更多
基金supported by the National Natural Science Foundation of China(21773215,J1210060)the Innovative Research Grant for Undergraduate Students of National/Zhengzhou University(201710459008)~~
文摘The self-assembly between poly(4-diazonium styrene) (PDS) and poly(sodiumsulfonate styrene)(PSS) was investigated.The mutilayer ult ra thin films were fabricated layer-by-layer successfully from PDS and PSS.Af ter heating for 10 min at 70℃ the multilayer film became very stable towards po lar solvents.No considerable changes were observed for the heated film soaked i n DMF (20℃) for 48 h,while the unheated film almost destroyed at same conditio n.The dramatic improvement in stability of the film towards polar solvents shou ld be attributed to the conversion of bonds between the layers of the film from ionic bond to covalent bond under heating.Y(4 DIAZONIUMSTYRENE)ANDPOLY(SODIUMSULFONATESTYRENE)YANGZhaohui,JIANGWei,CAOWeixiao(CollegeofChemistryandMolecularEngineering ,PekingUniversity ,Beijing 10 0 871)Abstract Theself assemblybetweenpoly( 4 diazoniumstyrene) (PDS)andpoly(sodiumsulfonatestyrene) (PSS)wasinvestigated .Themutilayerultrathinfilmswerefabricatedlayer by layersuccessfullyfromPDSandPSS .Afterheatingfor 1 0minat 70℃themultilayerfilmbecameverystabletowardspolarsolvents.NoconsiderablechangeswereobservedfortheheatedfilmsoakedinDMF ( 2 0℃ )for48h ,whiletheunheatedfilmalmostdestroyedatsamecondition.Thedramaticimprovementinstabilityofthefilmtowardspolarsolventsshouldbeattributedtotheconversionofbondsbetweenthelayersofthefilmfromionicbondtocovalentbondunderheating .Keywords Poly( 4 diazoniumstyrene) 。
文摘Tetra(4-diazoniumbenzene)porphyrin(TDBP) was synthesized via diazo-reaction of tetra-(4-aminobenzene)porphyrin(TABP). From the analysis results of MALDI-TOF mass spectroscopy and FTIR,it was confirmed that the synthesized porphyrin derivative mainly consists of tetra(4-diazoniumbenzene) porphyrin with trace tri- and di-substituted compounds. The self-assembly of TDBP with poly(styrene sulfonate)(PSS) was carried out and a novel TDBP/PSS multilayer ultrathin film on silicon substrate was obtained. The self-assembled film is very sensitive to heat and light,after heating or irradiation of UV light,the thin film becomes very stable towards polar solvents such as DMF. The coupling reaction of TDBP with phenol and the thermal stability of TDBP were also investigated preliminary. [WT5HZ]
文摘Homopolymerization of 4-vinyl pyridine（4-VP） and copolymerization of 4-VP with styrene（St） were performed by catalyst systems composed of calix[4]arene-neodymium complex 2,di-n-butylmagnesium and hexamethyl phosphoramide. The molecular weight of P（4-VP） was greatly affected by adding calix[4]arene-neodymium complex,and high molecular weight of P（4-VP） was got by using calix[4]arene-neodymium complex.The highest molecular weight of P（4-VP） was as high as 4.65×106 obtained by using a catalyst system with 2.0×10-4?mol/L of calix[4]arene-neodymium complex,while the molecular weight of P（4-VP） was only 5.62×105 without calix[4]arene-neodymium complex. In addition,4-VP-St copolymers with different 4-VP contents were obtained in good yield.When styrene was polymerized first for a time period,and then 4-VP was added,4-VP-St copolymers with 4.85?mol%～23.3?mol% of 4-VP units were obtained,but when 4-VP and styrene were added at the same time the resultant 4-VP-St copolymers had 44.0?mol%～66.3?mol% of 4-VP units.
文摘To obtain a novel support with practical value for metallocene catalyst(\%η\%\|C\-5H\-5)TiCl\-3(CpTiCl\-3), poly(styrene\|co\|4\|vinylpyridine)/SiO\-2 nanoscale hybrid material(SrP/SiO\-2) was firstly produced as support. After pretreatment by methylaluminoxane(MAO), the hybrid materials reacted with CpTiCl\-3. The results from SAXS, SEM and TEM indicated the morphology and structure of organic/inorganic hybrid materials, and the size of inorganic particle in hybrid was nanoscale. The results from IR and XPS showed that there were two possible cationic active species in the hybrid\|supported catalyst, the polymerization results of styrene proved this possibility.
