Table 4.

Results of diffusion coefficients (D) obtained from the Higuchi equation. (Means values, and in parentheses standards deviations (n = 3).)

copolymers	D cm2 s–1 (×10−9)	r2
T904	1.500 (0.106)	0.9811
T908	0.061 (0.006)	0.9391
T1107	2.330 (0.314)	0.9533
T1307	2.410 (0.165)	0.9693
T1107 : T1307 (50 : 50)	1.630 (0.098)	0.9590
T904 : T1107 (25 : 75)	0.510 (0.006)	0.9839
T904 : T1307 (25 : 75)	0.592 (0.059)	0.9807
T904 : T1107 (50 : 50)	0.889 (0.160)	0.9758
T904 : T1307 (50 : 50)	1.290 (0.205)	0.9311
T904 : T1107 (75 : 25)	0.926 (0.016)	0.9802
T904 : T1307 (75 : 25)	4.870 (0.426)	0.9874