物理化学学报 >> 2007, Vol. 23 >> Issue (04): 513-516.doi: 10.1016/S1872-1508(07)60033-3

研究论文 上一篇    下一篇

甲基丙烯酸甲酯、甲基丙烯酸乙酯与酚络合的介电驰豫行为

LIAKATHALIKHAN Faize; SIVAGURUNATHAN Periyasamy   

  1. Department of Physics, Annamalai University, Annamalai Nagar, Tamil Nadu-608 002, India
  • 收稿日期:2006-10-08 修回日期:2006-11-17 发布日期:2007-04-05
  • 通讯作者: LIAKATHALIKHAN Faize E-mail:shamisardar@yahoo.com

Dielectric Relaxation ofMethyl Methacrylate and Ethyl Methacrylate on Complexation with Phenols

LIAKATHALIKHAN Faize; SIVAGURUNATHAN Periyasamy   

  1. Department of Physics, Annamalai University, Annamalai Nagar, Tamil Nadu-608 002, India
  • Received:2006-10-08 Revised:2006-11-17 Published:2007-04-05
  • Contact: LIAKATHALIKHAN Faize E-mail:shamisardar@yahoo.com

摘要: Dielectric absorption studies of H-bonded complexes of methyl methacrylate (MMA) and ethyl methacrylate (EMA) with p-cresol, p-chlorophenol, 2,4-dichlorophenol, and p-bromophenol were studied at microwave frequency 9.37 GHz in dilute solution of carbon tetrachloride at 308 K. Different dielectric parameters like dielectric constant ε' and dielectric loss ε'' at microwave frequency, static dielectric constant ε0 and dielectric constant ε∞ at optical frequency were determined. The validity of the single frequency equation of Higasi et al. for multiple relaxation time τ(1) was found to be a function of the hydrogen bonding strength of phenolic hydrogen, whereas the group rotation relaxation time τ(2) was a function of the steric interaction of proton donor. The relaxation time was the maximumat 50:50 (molar ratio) of methacrylates with phenols.

关键词: Acrylic esters, Phenol derivatives, Dielectric relaxation, X-band microwave

Abstract: Dielectric absorption studies of H-bonded complexes of methyl methacrylate (MMA) and ethyl methacrylate (EMA) with p-cresol, p-chlorophenol, 2,4-dichlorophenol, and p-bromophenol were studied at microwave frequency 9.37 GHz in dilute solution of carbon tetrachloride at 308 K. Different dielectric parameters like dielectric constant ε' and dielectric loss ε'' at microwave frequency, static dielectric constant ε0 and dielectric constant ε∞ at optical frequency were determined. The validity of the single frequency equation of Higasi et al. for multiple relaxation time τ(1) was found to be a function of the hydrogen bonding strength of phenolic hydrogen, whereas the group rotation relaxation time τ(2) was a function of the steric interaction of proton donor. The relaxation time was the maximumat 50:50 (molar ratio) of methacrylates with phenols.

Key words: Acrylic esters, Phenol derivatives, Dielectric relaxation, X-band microwave

MSC2000: 

  • O645