We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Syntheses of high molecular mass polyglycolides via ring-opening polymerization with simultaneous polycondensation (ROPPOC) by means of tin and zinc catalysts.
- Authors
Kricheldorf, Hans R.; Weidner, Steffen M.; Meyer, Andreas
- Abstract
Glycolide was polymerized in bulk by means of four different ROPPOC catalysts: tin(II) 2-ethylhexanoate (SnOct2), dibutyltin bis(pentafluoro-phenoxide) (BuSnOPF), zinc biscaproate (ZnCap), and zinc bis(pentafluoro-phenyl sulfide) (ZnSPF). The temperature was varied between 110 and 180°C and the time between 3 h and 7 days. For the few polyglycolides (PGAs) that were soluble extremely high molecular masses were obtained. The MALDI TOF mass spectra had all a low signal-to-noise ration and displayed the peaks of cyclic PGAs with a "saw-tooth pattern" indicating formation of extended-ring crystallites in the mass range below m/z 2500. The shape of DSC curves varied considerably with catalyst and reaction conditions, whereas the long-distance values measured by SAXS were small and varied little with the polymerization conditions.
- Subjects
ZINC catalysts; MOLECULAR weights; TIN; POLYCONDENSATION; RING-opening polymerization; MASS spectrometry
- Publication
Polymers for Advanced Technologies, 2024, Vol 35, Issue 4, p1
- ISSN
1042-7147
- Publication type
Article
- DOI
10.1002/pat.6365