By Bhargava R.
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Additional resources for Liquid Chromatography Ftir Microspectroscopy, Microwave Assisted Synthesis
Bartkowiak and Hunkeler separated poly(S-co-MMA) according to their chemical composition by LCCC . They also showed the possibility to couple with SEC for the simultaneous identification of copolymer composition and molecular weight distributions. Sauzedde and Hunkeler tested the effect of molecular weight and composition in LCCC retention with two series of poly(S-co-MMA) . The first series varies with respect to the chemical composition in the copolymer, at a constant molar mass, while the second has molecular weight variation at a fixed composition.
4% PI content): A NP-TGIC chromatograms of the PS-b-PI (top) and a fraction, f6 (bottom), which separates PS-b-PI in terms of the PS block length only. Temperature program is also shown in the plot; B RPLC chromatogram of the NP-TGIC fraction, f6, which separates in terms of the PI block length only. It elutes as a single peak in NP-TGIC, but shows multiple peaks in RPLC indicating that it contains homogeneous PS block length (eight monomer units) but various PI block lengths. Reproduced from  with permission different morphologies for the fractions taken from the same mother block copolymer .
Most of the LCCC applications to the characterization of block copolymers have been made in this mode and the determination of the molecular weight distribution of the “visible” block has been made using the Recent Advances in Liquid Chromatography Analysis of Synthetic Polymers 31 Fig. 16. Dependence of capacity factor on total degree of polymerization of PLLA blocks in PLLA-b-PEO-b-PLLA triblock copolymer at the critical condition of PEO block. Squares, circles and triangles are assigned to each series of the triblock copolymers with two, four, and six L-lactide units at one end and a varying block length at the other end of the PEO block, respectively.