Solubilities of 4-hydroxybenzaldehyde, 3-bromo-4-hydroxybenzaldehyde, 3,5 -dibromo-4-hydroxybenzaldehyde in chloroform were measured at temperatures ranging from 283.15 K to 323.15 K.The measurements of temperature an...Solubilities of 4-hydroxybenzaldehyde, 3-bromo-4-hydroxybenzaldehyde, 3,5 -dibromo-4-hydroxybenzaldehyde in chloroform were measured at temperatures ranging from 283.15 K to 323.15 K.The measurements of temperature and enthalpy of fusion of pure solutes were used for caculation of solubility by ideal solution model,which was higher than the experimental values.The very low solubility in chloroform was due to self association of solute molecules.A λh formula was used to fit the data and had shown good correlation results.展开更多
Solid liquid equilibrium data for three binary systems: 4 hydroxybenzaldehyde/3 bromo 4 hydroxybenzaldehyde,4 hydroxybenzaldehyde/3,5 dibromo 4 hydroxybenzaldehyde,3 bromo 4 hydroxy benzaldehyde/3,5 dibromo 4 hydroxyb...Solid liquid equilibrium data for three binary systems: 4 hydroxybenzaldehyde/3 bromo 4 hydroxybenzaldehyde,4 hydroxybenzaldehyde/3,5 dibromo 4 hydroxybenzaldehyde,3 bromo 4 hydroxy benzaldehyde/3,5 dibromo 4 hydroxybenzaldehyde were determined by differential scanning calorimetry and corresponding phase diagrams were given λh equation and Wilson equation were used to correlate the data It was shown that the results obtained by two models were both展开更多
以1,4-二氧六环为溶剂,AIBN为引发剂,N-[(4-溴-3,5-二氟)苯基]马来酰亚胺(BDPM)和苯乙烯(St)为原料,通过溶液聚合合成了N-[(4-溴-3,5-二氟)苯基]马来酰亚胺/苯乙烯(BDPM/St)二元共聚物,考察了单体投料比、单体总浓度、引发剂浓度和反应...以1,4-二氧六环为溶剂,AIBN为引发剂,N-[(4-溴-3,5-二氟)苯基]马来酰亚胺(BDPM)和苯乙烯(St)为原料,通过溶液聚合合成了N-[(4-溴-3,5-二氟)苯基]马来酰亚胺/苯乙烯(BDPM/St)二元共聚物,考察了单体投料比、单体总浓度、引发剂浓度和反应时间对共聚的影响。采用红外光谱(FT-IR)和1 H NMR对其结构进行了表征,根据元素分析测定结果,计算得到共聚物中两种单体单元的摩尔配比接近1∶1,表明了BD-PM和St具有明显的交替共聚趋势。通过热重分析对BDPM/St的热性能进行了表征,结果表明,二元共聚物具有优良的热稳定性。GPC测定其相对分子质量(Mn=2.17×105,MW=2.85×105,D=1.4),表明BD-PM/St聚合度较高。展开更多
The novel title compound(Z)-N-(4-bromo-5-ethoxy-3,5-dimethylfuran-2(5H)-yli-dene)-4-methylbenzenesulfonamide 1(C15H18BrNO4S) has been unexpectedly synthesized by the aminohalogenation reaction of ethyl 2-methy...The novel title compound(Z)-N-(4-bromo-5-ethoxy-3,5-dimethylfuran-2(5H)-yli-dene)-4-methylbenzenesulfonamide 1(C15H18BrNO4S) has been unexpectedly synthesized by the aminohalogenation reaction of ethyl 2-methylpenta-2,3-dienoate with TsNBr2,and characterized by mp,IR,1H NMR,EIMS,ESIHRMS and single-crystal X-ray diffraction.It crystallizes in mono-clinic,space group P21/c with a = 11.714(5),b = 14.106(5),c = 10.402(4) ,β = 97.298(8)°,V = 1704.9(12) 3,Mr = 388.27,Z = 4,Dc = 1.513 g/cm3,μ(MoKα) = 2.549 mm-1,F(000) = 792,the final R = 0.033 and wR = 0.062 for 3098 observed reflections(Ⅰ 〉 2σ(Ⅰ)).展开更多
制备了N-[(4-溴-3,5-二氟)苯基]马来酰亚胺/苯乙烯/马来酸酐(BDPM/St/MA)三元共聚物,通过傅里叶红外光谱对其结构进行了确认。利用热分析考察了原料配比、热分解气氛和热解时间对聚合物热性能的影响,并研究了三元共聚物的热分解动力学...制备了N-[(4-溴-3,5-二氟)苯基]马来酰亚胺/苯乙烯/马来酸酐(BDPM/St/MA)三元共聚物,通过傅里叶红外光谱对其结构进行了确认。利用热分析考察了原料配比、热分解气氛和热解时间对聚合物热性能的影响,并研究了三元共聚物的热分解动力学。结果表明,随着共聚原料中BDPM物质的量的增加,三元聚合物的热稳定性逐渐提高,且BDPM/St/MA在氮气中的热稳定性较空气中更好。Flynn-Wall-Ozawa法获得BDPM/St/MA的热分解表观活化能为139.69 k J/mol,显示该聚合物热稳定性能优良。展开更多
文摘Solubilities of 4-hydroxybenzaldehyde, 3-bromo-4-hydroxybenzaldehyde, 3,5 -dibromo-4-hydroxybenzaldehyde in chloroform were measured at temperatures ranging from 283.15 K to 323.15 K.The measurements of temperature and enthalpy of fusion of pure solutes were used for caculation of solubility by ideal solution model,which was higher than the experimental values.The very low solubility in chloroform was due to self association of solute molecules.A λh formula was used to fit the data and had shown good correlation results.
文摘Solid liquid equilibrium data for three binary systems: 4 hydroxybenzaldehyde/3 bromo 4 hydroxybenzaldehyde,4 hydroxybenzaldehyde/3,5 dibromo 4 hydroxybenzaldehyde,3 bromo 4 hydroxy benzaldehyde/3,5 dibromo 4 hydroxybenzaldehyde were determined by differential scanning calorimetry and corresponding phase diagrams were given λh equation and Wilson equation were used to correlate the data It was shown that the results obtained by two models were both
文摘以1,4-二氧六环为溶剂,AIBN为引发剂,N-[(4-溴-3,5-二氟)苯基]马来酰亚胺(BDPM)和苯乙烯(St)为原料,通过溶液聚合合成了N-[(4-溴-3,5-二氟)苯基]马来酰亚胺/苯乙烯(BDPM/St)二元共聚物,考察了单体投料比、单体总浓度、引发剂浓度和反应时间对共聚的影响。采用红外光谱(FT-IR)和1 H NMR对其结构进行了表征,根据元素分析测定结果,计算得到共聚物中两种单体单元的摩尔配比接近1∶1,表明了BD-PM和St具有明显的交替共聚趋势。通过热重分析对BDPM/St的热性能进行了表征,结果表明,二元共聚物具有优良的热稳定性。GPC测定其相对分子质量(Mn=2.17×105,MW=2.85×105,D=1.4),表明BD-PM/St聚合度较高。
文摘The novel title compound(Z)-N-(4-bromo-5-ethoxy-3,5-dimethylfuran-2(5H)-yli-dene)-4-methylbenzenesulfonamide 1(C15H18BrNO4S) has been unexpectedly synthesized by the aminohalogenation reaction of ethyl 2-methylpenta-2,3-dienoate with TsNBr2,and characterized by mp,IR,1H NMR,EIMS,ESIHRMS and single-crystal X-ray diffraction.It crystallizes in mono-clinic,space group P21/c with a = 11.714(5),b = 14.106(5),c = 10.402(4) ,β = 97.298(8)°,V = 1704.9(12) 3,Mr = 388.27,Z = 4,Dc = 1.513 g/cm3,μ(MoKα) = 2.549 mm-1,F(000) = 792,the final R = 0.033 and wR = 0.062 for 3098 observed reflections(Ⅰ 〉 2σ(Ⅰ)).
文摘制备了N-[(4-溴-3,5-二氟)苯基]马来酰亚胺/苯乙烯/马来酸酐(BDPM/St/MA)三元共聚物,通过傅里叶红外光谱对其结构进行了确认。利用热分析考察了原料配比、热分解气氛和热解时间对聚合物热性能的影响,并研究了三元共聚物的热分解动力学。结果表明,随着共聚原料中BDPM物质的量的增加,三元聚合物的热稳定性逐渐提高,且BDPM/St/MA在氮气中的热稳定性较空气中更好。Flynn-Wall-Ozawa法获得BDPM/St/MA的热分解表观活化能为139.69 k J/mol,显示该聚合物热稳定性能优良。