TY - JOUR A1 - Meyer, A. A1 - Weidner, Steffen A1 - Kricheldorf, H. T1 - Stereocomplexation of cyclic polylactides with each other and with linear poly(L-lactide)s T2 - RSC Polymer Chemistry N2 - Two kinds of cyclic poly(D- and L-lactide)s were synthesized, namely CI labeled samples mainly consisting of even-numbered cycles with low dispersity and CII, CIII or CIV-labeled ones consisting of equal amounts of even and odd-numbered cycles with high dispersity and igher molecular weights (Mw up to 300 000). Furthermore, linear poly L-lactide)s were prepared by initiation with ethanol and in both series the molecular weight was varied. The formation of stereocomplexes from cyclic poly(D-lactide)s and all kinds of poly L-lactide)s was performed in dichloromethane/toluene mixtures. The stereocomplexes crystallized from the reaction mixture were characterized in the virgin state and after annealing at 205 °C. Stereocomplexes free of stereohomopolymers with crystallinities up to 80% were obtained from all experiments in yields ranging from 60 to 80%. Despite the high annealing temperature (maintained for 1 h), little transesterification was observed and the crystallinity slightly increased. PB - Royal Society for Chemistry KW - Polylactide KW - MALDI-TOF MS KW - Stereocomplex KW - Cyclic PY - 2019 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/49669 AN - OPUS4-49669 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-496693 VL - 10 SP - 6191 EP - 6199 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany