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

Table 2

The effect on copolymerization of reaction conditions.

Run	Feed mol ratio; NTBA/MA	AIBN; (% mol)	Temperature (°C)	Time; (h)	𝑀𝑛 (g/mol)	𝜂 (g/dL)	PDI	Acid number; (mg KOH/g)	N content; (%)	Conversion (%)
1^a	70/30	1.0	65	24	2800	0.063	1.09	285	8.54	3.3
2^a	60/40	1.0	65	24	3100	0.069	1.10	305	8.01	4.9
3^a	50/50	1.0	65	24	3400	0.073	1.10	354	7.46	9.1
4^a	40/60	1.0	65	24	4000	0.081	1.11	378	6.87	14.6
5^a	30/70	1.0	65	24	6100	0.097	1.12	412	6.52	34.1
6^a	30/70	0.3	65	24	6300	0.098	1.15	381	0.76	4.3
7^a	30/70	0.7	65	24	6200	0.096	1.13	390	1.54	8.6
8^a	30/70	1.4	65	24	5000	0.092	1.12	378	6.85	38.8
9^a	30/70	1.0	65	6	4800	0.091	1.11	362	2.69	15.1
10^a	30/70	1.0	65	3	4500	0.087	1.12	344	1.47	8.3
11^a	30/70	1.0	80	24	6000	0.096	1.16	384	6.03	34.0
12^a	30/70	1.0	50	24	4800	0.092	1.11	372	3.56	20.8
13^b	30/70	1.0	65	3	4200	0.083	1.11	322	1.23	7.2
14^b	30/70	1.0	65	24	5900	0.095	1.11	378	4.17	24.4

aNTBA added in four portions. ^bNTBA added at once.