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Issue 12, 2020
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High Tm poly(L-lactide)s via REP or ROPPOC of l-lactide

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Abstract

A new kind of high melting (HTm) pol(L-lactide) was discovered when cyclic poly(L-lactide)s were prepared by ring-expansion polymerization with cyclic tin catalysts at 130–160 °C in bulk. By DSC measurements with 10 K min−1 melting temperatures (Tm) in the range of 190–196 °C were found. The WAXS and SAXS measurements evidenced that not a new crystal lattice but a well-ordered morphology and a higher perfection of the crystallites are responsible for the high Tm values and high crystallinities. Under identical reaction conditions SnOct2-catalyzed and alcohol-initiated ROPs do not yield these crystallites. Furthermore, it was found that the standard crystallites are kinetically favored upon rapid crystallization, whereas the high melting form of poly(L-lactide) is thermodynamically more stable.

Graphical abstract: High Tm poly(L-lactide)s via REP or ROPPOC of l-lactide

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Supplementary files

Article information


Submitted
19 Dec 2019
Accepted
17 Feb 2020
First published
19 Feb 2020

This article is Open Access

Polym. Chem., 2020,11, 2182-2193
Article type
Paper

High Tm poly(L-lactide)s via REP or ROPPOC of L-lactide

H. R. Kricheldorf, S. M. Weidner and A. Meyer, Polym. Chem., 2020, 11, 2182
DOI: 10.1039/C9PY01908A

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