Controlled Release Formulations from SBR/NBR Rubber Blend. 1. Dielectric and Thermal Studies
Titel:
Controlled Release Formulations from SBR/NBR Rubber Blend. 1. Dielectric and Thermal Studies
Auteur:
El-awady, M. M. Ghoneim, A. M.
Verschenen in:
International journal of polymeric materials
Paginering:
Jaargang 48 (2000) nr. 1 pagina's 29-48
Jaar:
2000
Inhoud:
Styrene butadiene Rubber (SBR) and acrylonitrile butadiene rubber (NBR) blends were prepared with different concentration ratios, namely, 0:100, 20:80, 40:60, 60:40, 80:20 and 100:0. The blends were mixed with multifunctional monomer (triethylene glycol dimethacrylate) and copper sulphate monohydrate. The blends obtained were vulcanized with γ-radiation at a dose of rate 7.51 rad/sec. The thermal properties of the blends obtained were characterized using differential thermal analysis (DTA). The dielectric permittivity (ε') and dielectric loss (ε'') were also measured. The experimental results were analyzed and discussed to show that the dielectric properties of the blends are greatly affected by γ-irradiation and decreased by grafting and cross-linking processes. The results obtained also show that the irradiated rubber blends in the absence of multifunctional monomer are incompatible over the entire range of irradiation dose as proven by the DTA. On the other hand, in the presence of the monomer, they are partially compatible but under certain conditions of blend concentration ratio and irradiation dose.
Tijdschrift beschrijving