Separation of Poly(styrene-block-t-butyl methacrylate) Copolymers by Various Liquid Chromatography Techniques

Table 1

Molar-mass characteristics of the PS-b-PtBMA copolymers as determined by SEC-MALS.

Sample PS-b-PtBMA	𝑀𝑤×10^−3 g/mol	𝑀𝑛×10^−3 g/mol	𝑀𝑤/𝑀𝑛	^1molPS	^2𝑤PS	^3𝑑𝑛/𝑑𝑐 (mL/g)	𝑀𝑛×10^−3 PS block g/mol	𝑀𝑛×10^−3 PtBMA block g/mol
1	32.0	31.0	1.03	0.937	0.916	0.174	29.0	2.0
2	36.6	35.6	1.03	0.848	0.804	0.161	30.2	5.4
3	62.0	60.4	1.03	0.562	0.484	0.123	33.9	26.5

¹mol_PS: the mol fraction of PS was determined from proton NMR spectra.
²𝑤_PS: the weight fraction of PS was determined from the known mol fraction of PS and the molar mass of PS unit.
³dn/dc was determined according to (1).