The Scientific World Journal / 2012 / Article / Tab 1

Research Article

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 𝑀 𝑀 Γ— 1 0 βˆ’ 3  g/mol 𝑀 𝑛 Γ— 1 0 βˆ’ 3  g/mol 𝑀 𝑀 / 𝑀 𝑛 1 m o l P S 2 𝑀 P S 3 𝑑 𝑛 / 𝑑 𝑐  (mL/g) 𝑀 𝑛 Γ— 1 0 βˆ’ 3 PS block g/mol 𝑀 𝑛 Γ— 1 0 βˆ’ 3 PtBMA block g/mol

132.031.01.030.9370.9160.17429.02.0
236.635.61.030.8480.8040.16130.25.4
362.060.41.030.5620.4840.12333.926.5

1molPS: the mol fraction of PS was determined from proton NMR spectra.
2 𝑀 P S : 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).