N,N-二乙基甲酰胺与C_6-C_8芳烃二元混合溶液体系的体积性质研究

Volumetric Properties of Mixtures N,N die thylformamide aromatic hydrocarbon

利用振动管密度计在 2 98.15K下测定了 N,N-二乙基甲酰胺 (DEF)分别与苯、甲苯、对二甲苯、间二甲苯、邻二甲苯、乙苯、苯乙烯构成的二元溶液体系的过量摩尔体积 (Vm E) ,在全部浓度范围内 ,Vm E均为负值 ,|Vm E (极值 ) |和 |Vm E(x =0 .5) |大致有如下顺序 :苯乙烯 >甲苯 >对二甲苯 >苯 >邻二甲苯≈乙苯 >间二甲苯 .实验结果表明 DEF分子与芳烃分子之间有相当强的相互作用 .

Excess volumes have be en measured by means of a continuous dilatormeter for (N,N diethylformamide+benz ene or toluene or m xylene or p xylene or ethylbenzene or styrene) at T=298.15 K.V m E values are negative over the entire range of com position for all mixtures. ｜V m E(min)｜and ｜V m E(x=0.5)｜ values of this series decrease in the sequence :C 6H 5CH=CH 2> C 6H 5CH 3>p C 6H 4(CH 3) 2 > C 6H 6 >o C 6H 4(CH 3) 2≈C 6H 5CH 2CH 3>m C 6H 5CH 2CH 3>m C 6H 4(CH 3) 2.The results show that there are quite strong inte ractions between N,N diethylformamide and aromatic hydrocarbon.