The Asian Journal of Experimental Chemistry

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Reactivity Ratios Determination of Methacrylonitrile with Isobornyl Methacrylate by 1H NMR Spectroscopy


Affiliations
1 Department of Chemistry, Aurola Degree College, KUC ‘X’ Road, Vidyaranyapur, Warangal (A.P.), India
2 Department of Chemistry, Kakatiya University, Warangal (A.P.), India
     

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Copolymer of Methacrylonitrile (MAN) with Isobornyl methacrylate (IBM) has been studied by free radical polymerization using 1,1' azo bis (cyclohexanecarbonitrile) (VAZO) as initiator in Dimethyl formamide (DMF) at 60±1oC. The monomer reactivity ratio was computed by both Fineman-Ross (F-R) and Kelen-Tudos (K-T) methods. The reactivity ratio values suggested the formation of random copolymers which has been supported by the azeotropic composition evaluation. The mean sequence length (n) and probabilities (p) in the formation of various structurally units were evaluated. The molecular weights of the polymers were determined by gel permeation chromatography and they increase with increasing MAN content. The solubility parameters were determined with viscometric method. The glass transition temperature (Tg) of the copolymers were determined by differential scanning calorimetry (DSC). Thermo gravimetric analysis (TGA) of the copolymer was studied. The dielectric properties of the copolymer like the dielectric constant and dielectric loss were studied. The results have been compared with methacrylonitrile and isobornyl acrylate (MAN-IBA) system.

Keywords

Methacrylonitrile, Isobornyl Methacrylate, Copolymerization, Reactivity Ratios, Thermal and Dielectric Properties.
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  • Reactivity Ratios Determination of Methacrylonitrile with Isobornyl Methacrylate by 1H NMR Spectroscopy

Abstract Views: 236  |  PDF Views: 1

Authors

S. Sridevi
Department of Chemistry, Aurola Degree College, KUC ‘X’ Road, Vidyaranyapur, Warangal (A.P.), India
P. Raghunath Rao
Department of Chemistry, Kakatiya University, Warangal (A.P.), India

Abstract


Copolymer of Methacrylonitrile (MAN) with Isobornyl methacrylate (IBM) has been studied by free radical polymerization using 1,1' azo bis (cyclohexanecarbonitrile) (VAZO) as initiator in Dimethyl formamide (DMF) at 60±1oC. The monomer reactivity ratio was computed by both Fineman-Ross (F-R) and Kelen-Tudos (K-T) methods. The reactivity ratio values suggested the formation of random copolymers which has been supported by the azeotropic composition evaluation. The mean sequence length (n) and probabilities (p) in the formation of various structurally units were evaluated. The molecular weights of the polymers were determined by gel permeation chromatography and they increase with increasing MAN content. The solubility parameters were determined with viscometric method. The glass transition temperature (Tg) of the copolymers were determined by differential scanning calorimetry (DSC). Thermo gravimetric analysis (TGA) of the copolymer was studied. The dielectric properties of the copolymer like the dielectric constant and dielectric loss were studied. The results have been compared with methacrylonitrile and isobornyl acrylate (MAN-IBA) system.

Keywords


Methacrylonitrile, Isobornyl Methacrylate, Copolymerization, Reactivity Ratios, Thermal and Dielectric Properties.