Table 2. Catalytic evaluation using Ni1–Ni5/MAO for ethylene polymerization^a.

Entry	Precat.	T/°C	t/min	Al/Ni	Activityb	M w c	M w/Mnc	T m d
1	Ni1	30	30	1000	2.17	11.51	3.51	107.41
2	Ni1	30	30	1500	4.20	8.12	2.04	95.31
3	Ni1	30	30	2000	7.04	8.66	2.11	57.11
4	Ni1	30	30	2500	6.61	6.91	2.01	56.57
5	Ni1	30	30	3000	6.50	4.33	1.53	48.31
6	Ni1	10	30	2000	0.80	14.95	2.06	110.10
7	Ni1	15	30	2000	5.80	22.34	1.59	120.77
8	Ni1	20	30	2000	9.84	12.33	1.85	88.82
9	Ni1	40	30	2000	5.11	7.47	2.35	37.87
10	Ni1	50	30	2000	4.70	7.30	2.67	33.96
11	Ni1	60	30	2000	3.19	6.12	2.25	21.08
12	Ni1	70	30	2000	1.94	4.33	1.52	—g
13	Ni1	20	5	2000	26.56	7.72	1.62	50.05
14	Ni1	20	15	2000	12.74	8.30	2.20	95.50
15	Ni1	20	45	2000	7.20	20.91	1.92	103.63
16	Ni1	20	60	2000	5.65	26.72	1.21	106.97
17e	Ni1	20	30	2000	3.58	8.33	3.97	81.55
18f	Ni1	20	30	2000	1.10	7.67	1.96	54.70
19	Ni2	20	30	2000	3.65	11.61	1.71	101.64
20	Ni3	20	30	2000	1.34	25.02	1.68	104.45
21	Ni4	20	30	2000	6.46	12.61	2.06	90.92
22	Ni5	20	30	2000	5.87	19.67	2.52	92.86

^aConditions: 2 μmol Ni1 and 100 mL toluene, 10 atm C₂H₄.

^b10⁶ g(PE) mol⁻¹ (Ni) h⁻¹.

^c M _w 10⁵ g mol⁻¹, M_w and M_w/M_n determined by GPC.

^dDetermined by DSC.

^e5 atm of ethylene.

^f1 atm of ethylene.

^gBroad and weak endotherms, amorphous-like polyethylenes.