Environmental Recovery by Magnetic Nanocomposites Based on Castor Oil - Natural Polymers, Biopolymers, Biomaterials, and Their Composites, Blends, and IPNs - page 248

phthalic anhydride amount. In this case, as previously mentioned, the results that present
p < 0.05 are marked in bold.

Figure 16. (a) XRD of the maghemite, (b) composite containing 5 wt% of maghemite, (c) and resin.

table 4. Calculated effects of the studied factors over the magnetic force of the composites

Factors Effect Standard Error P

Average 1.8286E+0 2.1838E-2 0.0000E+0

Curvature -1.2414E-1 6.6717E-2 8.1268E-2

(1)Anhydride -2.5334E-1 4.3677E-2 2.7000E-5

(2)Castor oil 5.2404E-1 4.3677E-2 0.0000E+0

1 by 2 6.0748E-2 4.3677E-2 1.8331E-1

Figure 17. Magnetic force as a function of the castor oil amount and phtalic anhydride amount.