Molecular association of alkyl methacrylates and alcohols in non-polar solvents: Dielectric study

被引:17
|
作者
Sivagurunathan, P. [1 ]
Dharmalingam, K. [1 ]
Ramachandran, K. [1 ]
Kalamse, G. M. [2 ]
机构
[1] Annamalai Univ, Dept Phys, Annamalainagar 608002, Tamil Nadu, India
[2] Coll Sci, Postgrad Dept Phys, Nanded 431605, Maharashtra, India
关键词
Dielectric relaxation; Hydrogen bonding; Solvent effect;
D O I
10.1080/10241220600601639
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Experimental results of dielectric investigations at 9.84 GHz for alkyl methacrylates (methyl methacrylate, ethyl methacrylate and butyl methacrylate) with alcohols (1-butanol, secbutanol, tert-butanol and 1-decanol) have been studied in carbon tetrachloride and benzene at 298, 303, 313 and 323 K. The relaxation time and the thermodynamical parameters, viz., free energy, enthalpy and entropy of activation have been determined using the measured dielectric data. The results show a linear dependence of relaxation time on alkyl chain length of both alcohols and alkyl methacrylates and also on the nature of the solvent. Comparative study of free energy of activation for the dielectric relaxation and viscous flow suggest the fact that the process of viscous flow involves greater interference by neighbors than does dielectric relaxation, as the latter takes place by rotation only whereas the viscous flow involves both the rotational and translational forms of motion. The thermodynamic parameter shows negative value which indicates that the reaction is forward and exothermic.
引用
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页码:227 / 234
页数:8
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