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SmI2/Sm-Based γ-Buyrolactone−ε-Caprolactone Copolymers: Microstructural Characterization Using One- and Two-Dimensional NMR Spectroscopy

Title data

Agarwal, Seema ; Xie, Xiulan:
SmI2/Sm-Based γ-Buyrolactone−ε-Caprolactone Copolymers: Microstructural Characterization Using One- and Two-Dimensional NMR Spectroscopy.
In: Macromolecules. Vol. 36 (20 May 2003) Issue 10 . - pp. 3545-3549.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma0258713

Official URL: Volltext

Abstract in another language

Copolymers containing nonhomopolymerizable γ-butyrolactone (BL) and ε-caprolactone (CL) units of different compositions were synthesized by the ring-opening polymerization method using the SmI2/Sm initiator system. A maximum of 33 mol % of BL was incorporated into polycaprolactone (PCL) backbone. The microstructure of these copolymers was analyzed by one- and two-dimensional NMR spectroscopies. The overlapped methylene proton signals of CL and BL were resolved using 2D 1H−13C heteronuclear multibond correlation (HMBC) and homonuclear 1H−1H total correlation spectroscopy (TOCSY) techniques. The triad sequence distribution centered at the carbonyl carbon and methylene carbon of CL and BL has been obtained from 13C NMR spectroscopy. Further, 1D and 2D NMR spectroscopic techniques were used to confirm the change of microstructure from PCL blocks separated by discrete BL units to random copolymer structure having BL−BL units with increase in the mole percent of BL units in the copolymer.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: RING-OPENING POLYMERIZATION; ETHYLENE CARBONATE; DELTA-VALEROLACTONE; SAMARIUM COMPLEXES; LACTONES; BUTYROLACTONE; BIODEGRADABILITY; GLYCOLIDE
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Profile Fields > Advanced Fields > Polymer and Colloid Science
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Profile Fields
Profile Fields > Advanced Fields
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 07 Apr 2015 11:36
Last Modified: 07 Apr 2015 11:36
URI: https://eref.uni-bayreuth.de/id/eprint/9906