The Effect of H-Bonding on Radical Copolymerization of Maleic Anhydride with N-tert-Butylacrylamide and Its Characterization

Table 3

Kelen-Tüdös (KT) parameters for determination of monomer reactivity ratios for NTBA-MA pair.

Monomer ratio; NTBA/MA	By ^1H NMR	Parameters of KT equation			By N analysis	Parameters of KT equation			Mean sequence length^a
𝐹	𝑓	𝐹^2/𝑓+𝛼^b	𝜂	𝜉	𝑓	𝐹^2/𝑓+𝛼^b	𝜂	𝜉	𝜇1	𝜇2
2.35	2.11	3.36	0.33	0.79	2.05	3.42	0.33	0.80	1.91	1.04
1.53	1.43	2.30	0.24	0.70	1.51	2.10	0.27	0.68	1.70	1.05
1.00	1.30	1.42	0.18	0.55	1.40	1.43	0.19	0.52	1.64	1.05
0.66	1.12	1.08	0.10	0.37	1.13	1.10	0.08	0.35	1.51	1.06
0.40	0.94	0.91	−0.01	0.18	1.00	0.90	0.02	0.20	1.44	1.07

Rection conditions: solvent: 𝑝-dioxane, [𝑀] total = 1.33 mol/L, [AIBN] = 6.6×10⁻⁴ mol/L, 65±0.1 °C, conversion ≤ 10%.
aThese values were calculated by using the following𝑟₁ and 𝑟₂ values: 0.44 and 0.07 for NTBA-MA pair.
^b𝛼 (arbitrary constant) = 0.68 by elemental analysis.