Vanillin was used as renewable resource for preparing new monomer in two stops. The monomer has tertiary amine group which facilitates the pH change and functional aldehyde group that encourages the formation of Schif...Vanillin was used as renewable resource for preparing new monomer in two stops. The monomer has tertiary amine group which facilitates the pH change and functional aldehyde group that encourages the formation of Schiff base. It was abbreviated by DEAMVA and evaluated using chemical analysis e.g. 1H NMR, 13C NMR and FT IR all data were in logic case. Copolymerization of Styrene with 5 and 15 mol% of DEAMVA has been done by free radical polymerization and AIBN as initiator. The copolymers have been chemically and physically characterized e.g. 1H NMR, FT IR, GPC, and DSC. Post polymerization of poly (styrene-Co-DEAMVA) with 15 mol% (III b) was prepared for immobilization of tryptophan and investigated by the same methods used lately. Moreover, the sensitivity of the posted copolymer to pH has also studied by UV-vis. Spectroscopy. Scanning electron microscopy (SEM) was used to study the morphological feature of polymer surface after immobilization of tryptophan.展开更多
An increase of work function （0.3 eV） is achieved by irradiating poly（3,4-ethylenedioxythiophene）：poly（styrene sul- fonate） （PEDOT：PSS） film in vacuum with 254-nm ultraviolet （UV） light. The mechanism for ...An increase of work function （0.3 eV） is achieved by irradiating poly（3,4-ethylenedioxythiophene）：poly（styrene sul- fonate） （PEDOT：PSS） film in vacuum with 254-nm ultraviolet （UV） light. The mechanism for such an improvement is investigated by photoelectron yield spectroscopy, X-ray photo electron energy spectrum, and field emission technique. Sur- face oxidation and composition change are found as the reasons for work function increase. The UV-treated PEDOT：PSS film is used as the hole injection layer in a hole-only device. Hole injection is improved by UV-treated PEDOT：PSS film without baring the enlargement of film resistance. Our result demonstrates that UV treatment is more suitable for modifying the injection barrier than UV ozone exposure.展开更多
A general strategy forβ-selective silylcarbonylation of styrenes with CO_(2) via electrochemical reduction has been reported.A series of styrenes have been simultaneously introduced with silyl and carboxyl groups,and...A general strategy forβ-selective silylcarbonylation of styrenes with CO_(2) via electrochemical reduction has been reported.A series of styrenes have been simultaneously introduced with silyl and carboxyl groups,and these groups have been further converted to high-value functional groups.Detailed mechanistic experiments have proven that the single-electron reduction of CO_(2) is the key to this unique regioselectivity.展开更多
在传统的丙烯腈-丁二烯-苯乙烯共聚物(ABS)乳液接枝聚合中加入甲基丙烯酸缩水甘油酯(GMA),制得了改性ABS,然后与聚碳酸酯(PC)共混挤出,制得了PC/改性ABS复合材料。结果表明,GMA中的环氧基团能与PC的端羟基和端羧基反应,从而提升合金的...在传统的丙烯腈-丁二烯-苯乙烯共聚物(ABS)乳液接枝聚合中加入甲基丙烯酸缩水甘油酯(GMA),制得了改性ABS,然后与聚碳酸酯(PC)共混挤出,制得了PC/改性ABS复合材料。结果表明,GMA中的环氧基团能与PC的端羟基和端羧基反应,从而提升合金的相容性,且加入10 g GMA制备的改性ABS制作的PC/ABS合金综合性能最好,冲击强度由47 kJ/m^(2)提升到55.5 kJ/m^(2),PC/ABS的断裂伸长率由48%提升到70%。展开更多
文摘Vanillin was used as renewable resource for preparing new monomer in two stops. The monomer has tertiary amine group which facilitates the pH change and functional aldehyde group that encourages the formation of Schiff base. It was abbreviated by DEAMVA and evaluated using chemical analysis e.g. 1H NMR, 13C NMR and FT IR all data were in logic case. Copolymerization of Styrene with 5 and 15 mol% of DEAMVA has been done by free radical polymerization and AIBN as initiator. The copolymers have been chemically and physically characterized e.g. 1H NMR, FT IR, GPC, and DSC. Post polymerization of poly (styrene-Co-DEAMVA) with 15 mol% (III b) was prepared for immobilization of tryptophan and investigated by the same methods used lately. Moreover, the sensitivity of the posted copolymer to pH has also studied by UV-vis. Spectroscopy. Scanning electron microscopy (SEM) was used to study the morphological feature of polymer surface after immobilization of tryptophan.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61076057,61376059,61171023,and 91221202,)the National Basic Research Program of China(Grant Nos.2012CB932701 and 2011CB933001)
文摘An increase of work function （0.3 eV） is achieved by irradiating poly（3,4-ethylenedioxythiophene）：poly（styrene sul- fonate） （PEDOT：PSS） film in vacuum with 254-nm ultraviolet （UV） light. The mechanism for such an improvement is investigated by photoelectron yield spectroscopy, X-ray photo electron energy spectrum, and field emission technique. Sur- face oxidation and composition change are found as the reasons for work function increase. The UV-treated PEDOT：PSS film is used as the hole injection layer in a hole-only device. Hole injection is improved by UV-treated PEDOT：PSS film without baring the enlargement of film resistance. Our result demonstrates that UV treatment is more suitable for modifying the injection barrier than UV ozone exposure.
基金supported by the National Key R&D Program of China(2023YFA1507203)the National Natural Science Foundation of China(22371149,22301144,and 22188101)+3 种基金the Natural Science Foundation of Tianjin(24JCJQJC00210)the Fundamental Research Funds for the Central Universities(63223015)Frontiers Science Center for New Organic Matter,Nankai University(63181206)Nankai University are gratefully acknowledged.
文摘A general strategy forβ-selective silylcarbonylation of styrenes with CO_(2) via electrochemical reduction has been reported.A series of styrenes have been simultaneously introduced with silyl and carboxyl groups,and these groups have been further converted to high-value functional groups.Detailed mechanistic experiments have proven that the single-electron reduction of CO_(2) is the key to this unique regioselectivity.
文摘在传统的丙烯腈-丁二烯-苯乙烯共聚物(ABS)乳液接枝聚合中加入甲基丙烯酸缩水甘油酯(GMA),制得了改性ABS,然后与聚碳酸酯(PC)共混挤出,制得了PC/改性ABS复合材料。结果表明,GMA中的环氧基团能与PC的端羟基和端羧基反应,从而提升合金的相容性,且加入10 g GMA制备的改性ABS制作的PC/ABS合金综合性能最好,冲击强度由47 kJ/m^(2)提升到55.5 kJ/m^(2),PC/ABS的断裂伸长率由48%提升到70%。
