@misc{yobangoma_characterization_of_2011, author={Yoba N’Goma, P., Radke, W., Malz, F., Ziegler, H.J., Zierke, M., Behl, M., Lendlein, A.}, title={Characterization of multiblock copolymers by chromatographic techniques}, year={2011}, howpublished = {journal article}, doi = {https://doi.org/10.5301/IJAO.2011.6409}, abstract = {Multiblock copolymers (MBC) composed of blocks of poly(1,4-dioxanone) (PPDO) and poly(e-caprolactone) (PCL) were investigated in order to gain information on the extend of chemical heterogeneity of the samples. A gradient chromatographic method was established allowing separation of purely PPDO- from purely PCL-containing chains. Application of the gradient to MBC made of PPDO- and PCL-diols connected by trimethylhexamethylene diisocyanate (TMDI) resulted in two well separated peaks which were analyzed by means of FTIR, 1H-NMR and pyrolysis GC-MS. It was shown that the first peak was composed to a large extent of PPDO and only lower amounts of PCL were incorporated. Conversely, the second peak consisted predominantly of PCL with only a minor fraction of PPDO. Thus, the MBCs having PPDO and PCL segments show an unexpected broad chemical heterogeneity.}, note = {Online available at: \url{https://doi.org/10.5301/IJAO.2011.6409} (DOI). Yoba N’Goma, P.; Radke, W.; Malz, F.; Ziegler, H.; Zierke, M.; Behl, M.; Lendlein, A.: Characterization of multiblock copolymers by chromatographic techniques. The International Journal of Artificial Organs. 2011. vol. 34, no. 2, 110-119. DOI: 10.5301/IJAO.2011.6409}}