以自制苯酚-亚联苯型酚醛树脂、环氧氯丙烷为主要原料,采用固体碱作为醚化阶段催化剂,合成了一种苯酚-亚联苯型环氧树脂。借助红外光谱(FTIR)、核磁共振光谱(1 H NMR和13C NMR)、凝胶渗透色谱(GPC)分别对产物的结构、组成和分子量进行...以自制苯酚-亚联苯型酚醛树脂、环氧氯丙烷为主要原料,采用固体碱作为醚化阶段催化剂,合成了一种苯酚-亚联苯型环氧树脂。借助红外光谱(FTIR)、核磁共振光谱(1 H NMR和13C NMR)、凝胶渗透色谱(GPC)分别对产物的结构、组成和分子量进行了表征,结果成功制备了苯酚-亚联苯型环氧树脂,相对分子质量为870,环氧当量为274g/eq。此外,将所得苯酚-亚联苯型环氧树脂用于环氧模塑料中,并与市售环氧树脂所得的模塑料进行比较,借助热失重分析仪(TGA)、热机械分析仪(TMA)等对模塑料的主要性能进行研究,结果表明含有苯酚-亚联苯型环氧树脂的模塑料具有较长的凝胶时间和流动长度,具有较高的Tg(142℃)以及较高的初始降解温度(413℃),完全可以满足无铅焊料的加工工艺要求,并具有较好的弯曲强度和弯曲模量。展开更多
以苯硫酚钠和对硝基氯苯为原料,经过取代、还原、重氮化、水解4步反应,最终合成了4-苯硫基苯酚,通过单因素实验确定了还原反应的较佳条件是:原料配比n(4-硝基二苯硫醚):n(水合肼)=1:2.5,催化剂三氯化铁用量为4-硝基二苯硫醚质量的3.0%,...以苯硫酚钠和对硝基氯苯为原料,经过取代、还原、重氮化、水解4步反应,最终合成了4-苯硫基苯酚,通过单因素实验确定了还原反应的较佳条件是:原料配比n(4-硝基二苯硫醚):n(水合肼)=1:2.5,催化剂三氯化铁用量为4-硝基二苯硫醚质量的3.0%,反应温度70℃,反应时间4.5h。目标产物4-苯硫基苯酚总收率约为64%,纯度为95%。目标产物的结构通过IR、GC-MS和1 H NMR进行了确证。展开更多
A series of graphitic carbon nitride supported vanadium catalysts（xV/g-C3N4） with different vanadium contents（x/%） were prepared by impregnation.XRD,FT-IR,TEM,TG-DTG,nitrogen adsorption and XPS characterizations w...A series of graphitic carbon nitride supported vanadium catalysts（xV/g-C3N4） with different vanadium contents（x/%） were prepared by impregnation.XRD,FT-IR,TEM,TG-DTG,nitrogen adsorption and XPS characterizations were conducted which revealed a strong interaction between the vanadium species and g-C3N4 support.8V/g-C3N4 exhibited the highest activity and showed stable recyclability in the benzene hydroxylation reaction with a benzene conversion of 24.6%and phenol selectivity of 99.2%under the optimized conditions.The excellent catalytic performance of xV/g-C3N4 was due to the integration of vanadium species with high catalytic activity and the g-C3N4support in their interaction with the benzene substrate.展开更多
Electrochemical copolymerization of phenol and aniline was achieved on 304 stainless steel anodes in neutral water solution with an electrolyte of Na2SO4O4. Compared with pit corrosion potential of different copolymer...Electrochemical copolymerization of phenol and aniline was achieved on 304 stainless steel anodes in neutral water solution with an electrolyte of Na2SO4O4. Compared with pit corrosion potential of different copolymer coatings, the best solution composition was 0.09 mol/L phenol and 0.01 mol/L aniline. Through infrared spectrum analysis, polyaniline structure was proved in phenol-aniline copolymer, as well as more side chains. Scanning electron microscope was used to analyze microstructure of copolymer coating, taking advantage of part solubility of phenol-aniline eopolymer in tetrahydrofuran, the bifurcate network structure was observed. The copolymer coating microstructure was summarized, compared with the performance of polyphenol coatings, the reasons of corrosion resistance enhancement with the addition of aniline in electropolymerization reaction was assumed as well.展开更多
文摘以自制苯酚-亚联苯型酚醛树脂、环氧氯丙烷为主要原料,采用固体碱作为醚化阶段催化剂,合成了一种苯酚-亚联苯型环氧树脂。借助红外光谱(FTIR)、核磁共振光谱(1 H NMR和13C NMR)、凝胶渗透色谱(GPC)分别对产物的结构、组成和分子量进行了表征,结果成功制备了苯酚-亚联苯型环氧树脂,相对分子质量为870,环氧当量为274g/eq。此外,将所得苯酚-亚联苯型环氧树脂用于环氧模塑料中,并与市售环氧树脂所得的模塑料进行比较,借助热失重分析仪(TGA)、热机械分析仪(TMA)等对模塑料的主要性能进行研究,结果表明含有苯酚-亚联苯型环氧树脂的模塑料具有较长的凝胶时间和流动长度,具有较高的Tg(142℃)以及较高的初始降解温度(413℃),完全可以满足无铅焊料的加工工艺要求,并具有较好的弯曲强度和弯曲模量。
文摘以苯硫酚钠和对硝基氯苯为原料,经过取代、还原、重氮化、水解4步反应,最终合成了4-苯硫基苯酚,通过单因素实验确定了还原反应的较佳条件是:原料配比n(4-硝基二苯硫醚):n(水合肼)=1:2.5,催化剂三氯化铁用量为4-硝基二苯硫醚质量的3.0%,反应温度70℃,反应时间4.5h。目标产物4-苯硫基苯酚总收率约为64%,纯度为95%。目标产物的结构通过IR、GC-MS和1 H NMR进行了确证。
基金supported by the National Natural Science Foundation of China(21371035,21473036)SINOPEC(X514005)
文摘A series of graphitic carbon nitride supported vanadium catalysts（xV/g-C3N4） with different vanadium contents（x/%） were prepared by impregnation.XRD,FT-IR,TEM,TG-DTG,nitrogen adsorption and XPS characterizations were conducted which revealed a strong interaction between the vanadium species and g-C3N4 support.8V/g-C3N4 exhibited the highest activity and showed stable recyclability in the benzene hydroxylation reaction with a benzene conversion of 24.6%and phenol selectivity of 99.2%under the optimized conditions.The excellent catalytic performance of xV/g-C3N4 was due to the integration of vanadium species with high catalytic activity and the g-C3N4support in their interaction with the benzene substrate.
文摘Electrochemical copolymerization of phenol and aniline was achieved on 304 stainless steel anodes in neutral water solution with an electrolyte of Na2SO4O4. Compared with pit corrosion potential of different copolymer coatings, the best solution composition was 0.09 mol/L phenol and 0.01 mol/L aniline. Through infrared spectrum analysis, polyaniline structure was proved in phenol-aniline copolymer, as well as more side chains. Scanning electron microscope was used to analyze microstructure of copolymer coating, taking advantage of part solubility of phenol-aniline eopolymer in tetrahydrofuran, the bifurcate network structure was observed. The copolymer coating microstructure was summarized, compared with the performance of polyphenol coatings, the reasons of corrosion resistance enhancement with the addition of aniline in electropolymerization reaction was assumed as well.
