Fig. 4

Concentration profiles of 10–20% Butyl-Nena in terms of nitrocellulose radius at 70˚C for 4 h. (a) 10% Butyl-Nena, (b) 12% Butyl-Nena, (c) 14% Butyl-Nena, (d) 16% Butyl-Nena, (e) 18% Butyl-Nena, (f) 20% Butyl-Nena