Table 1. Ethylene polymerization for cocatalyst selection^a.

Entry	Co-catalyst	Al/Ni	Activityb	M w c	M w/Mnc	T m d
1	MAO	2000	7.04	8.66	2.11	57.11
2	MMAO	2000	3.47	20.69	1.77	95.14
3	EASC	400	0.33	13.49	1.55	55.40
4	Et2AlCl	600	4.27	9.02	3.37	41.18

^aConditions: 2 μmol Ni1 and 100 mL toluene, 10 atm C₂H₄, 30 °C, 30 min.

^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.