Table 1 Summarized data for the copolymerization of two types of β-substituted acrylates^a

Entry	M¹	M²	Initiator	Catalyst	Solvent	[M¹]₀	[M²]₀	Time	x^{1 c}	x^{2 c}	yield^d	M_n^e	Đ^e	f ^f
			mmol	mmol	mL	mol L⁻¹	mol L⁻¹	h	%	%	%	g mol⁻¹	M_w/M_n	%
1	MC	EC	0.025	0.025	8.9	0.50	0.50	48	100	100	100	84,500	1.18	51
2	MC	iPC	0.025	0.025	8.8	0.50	0.50	96	61	87	59	76,600	1.14	45
3	MC	nBC	0.025	0.025	8.7	0.50	0.50	48	100	100	100	107,600	1.18	45
4	MC	MCin	0.10	0.10	6.5	0.64	0.64	168	100	84	95	24,900	1.26	48
5	EC	MCin	0.10	0.10	6.4	0.64	0.64	168	100	85	94	25,200	1.25	50
6	iPC	MCin	0.10	0.10	6.3	0.64	0.64	168	100	41	62	16,300	1.23	60
7	nBC	MCin	0.10	0.10	6.3	0.64	0.64	168	100	79	83	27,800	1.19	49
8^b	MC	nBC	0.025	0.025	8.7	0.69	–	24 + 24	100	20	44	53,100	1.10	48
9^b	nBC	MC	0.025	0.025	8.7	0.69	–	24 + 24	100	10	59	63,900	1.09	48

^aPerformed on an aluminum block at 0 °C in an argon atmosphere. The polymerization conditions were as follows: M¹ feed and M² feed = 5.0 mmol, initiator = ^tBuMe2SKA, catalyst = Tf₂NSi^tBuMe₂ (generated via the in situ reaction between ^tBuMe2SKA and Tf₂NH (Scheme S1, Supporting Information)), solvent = CH₂Cl₂. M¹ and M² were fed simultaneously into the polymerization system (one-stage polymerization)
^bTwo-stage polymerization was conducted. M¹ was homopolymerized for 24 h in the first stage, and then a second feed of M² was added to the system. The second stage of polymerization was conducted for an additional 24 h
^cMonomer conversions (x¹ = M¹ conv., and x² = M² conv.) were calculated directly using ¹H NMR measurements (500 MHz, rt, CDCl₃) of the reaction mixture
^dThe polymer yield was calculated based on the total weight of the feed monomers
^eThe number-averaged molecular weight (M_n) and dispersity (Đ) were determined using conventional GPC against PSt standards in CHCl₃
^fInitiator efficiency: f = [molecular weight of polymer calculated by a feed ratio]/[number-average molecular weight of polymers determined by GPC]

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