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- W4309583172 abstract "Abstract Ring‐expansion polymerizations (REPs) catalyzed by two cyclic tin catalysts (2‐stanna‐1.3‐dioxa‐4,5,6,7‐dibenzazepine [SnBiph] and 2,2‐dibutyl‐2‐stanna‐1,3‐dithiolane [DSTL]) are performed at 140 °C in bulk. Small amounts (4 vol%) of chlorobenzene or other solvents are added to facilitate transesterification reactions (ring–ring equilibration) in the solid poly( l ‐lactide)s. In the mass range up to m/z 13 000 crystalline PLAs displaying a so‐called saw‐tooth pattern in the MALDI‐TOF mass spectra are obtained indicating the formation of extended‐ring crystals. The characteristics of extended‐ring crystallites and folded‐ring crystallites are discussed. Furthermore, extremely high melting temperatures ( T m 's up to 201.2 °C) and melting enthalpies (Δ H m 's up to 106 J g −1) ) are found confirming that Δ H m max, the Δ H m of a perfect crystal, is around or above 115 J g − 1 in contrast to literature data." @default.
- W4309583172 created "2022-11-28" @default.
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- W4309583172 date "2022-12-07" @default.
- W4309583172 modified "2023-10-16" @default.
- W4309583172 title "About the Influence of (Non‐)Solvents on the Ring Expansion Polymerization of <scp>l</scp>‐Lactide and the Formation of Extended Ring Crystals" @default.
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- W4309583172 doi "https://doi.org/10.1002/macp.202200385" @default.
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