Abstract
New zinc guanidine complexes with N,O donor functionalities were prepared, characterized by X-Ray crystallography, and examined for their catalytic activity in the solvent-free ring-opening polymerization (ROP) of technical-grade rac-lactide at 150 °C. All complexes showed a high activity. The fastest complex [ZnCl2(DMEGasme)] (C1) produced colorless poly(lactide) (PLA) after 90 min with a conversion of 52 % and high molar masses (Mw=69 100, polydispersity=1.4). The complexes were tested with different monomer-to-initiator ratios to determine the rate constant kp. Furthermore, a polymerization with the most active complex C1 was monitored by in situ Raman spectroscopy. Overall, conversion of up to 90 % can be obtained. End-group analysis was performed to clarify the mechanism. All four complexes combine robustness against impurities in the lactide with high polymerization rates, and they represent the fastest robust lactide ROP catalysts to date, opening new avenues to a sustainable ROP catalyst family for industrial use.
| Original language | English |
|---|---|
| Pages (from-to) | 3547-3556 |
| Number of pages | 10 |
| Journal | ChemSusChem |
| Volume | 10 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - 22 Sep 2017 |
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Keywords
- catalysis
- guanidine
- poly(lactide)
- ring-opening polymerization
- zinc
ASJC Scopus subject areas
- Environmental Chemistry
- Chemical Engineering(all)
- Materials Science(all)
- Energy(all)
Cite this
Highly Active N,O Zinc Guanidine Catalysts for the Ring-Opening Polymerization of Lactide. / Schäfer, Pascal M; Fuchs, Martin ; Ohligschläger, Andreas ; Rittinghaus, Ruth ; McKeown, Paul; Akin, Enver; Schmidt, Maximilian ; Hoffmann, Alexander; Liauw, Marcel A.; Jones, Matthew; Herres-Pawlis, Sonja.
In: ChemSusChem, Vol. 10, No. 18, 22.09.2017, p. 3547-3556.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Highly Active N,O Zinc Guanidine Catalysts for the Ring-Opening Polymerization of Lactide
AU - Schäfer, Pascal M
AU - Fuchs, Martin
AU - Ohligschläger, Andreas
AU - Rittinghaus, Ruth
AU - McKeown, Paul
AU - Akin, Enver
AU - Schmidt, Maximilian
AU - Hoffmann, Alexander
AU - Liauw, Marcel A.
AU - Jones, Matthew
AU - Herres-Pawlis, Sonja
PY - 2017/9/22
Y1 - 2017/9/22
N2 - New zinc guanidine complexes with N,O donor functionalities were prepared, characterized by X-Ray crystallography, and examined for their catalytic activity in the solvent-free ring-opening polymerization (ROP) of technical-grade rac-lactide at 150 °C. All complexes showed a high activity. The fastest complex [ZnCl2(DMEGasme)] (C1) produced colorless poly(lactide) (PLA) after 90 min with a conversion of 52 % and high molar masses (Mw=69 100, polydispersity=1.4). The complexes were tested with different monomer-to-initiator ratios to determine the rate constant kp. Furthermore, a polymerization with the most active complex C1 was monitored by in situ Raman spectroscopy. Overall, conversion of up to 90 % can be obtained. End-group analysis was performed to clarify the mechanism. All four complexes combine robustness against impurities in the lactide with high polymerization rates, and they represent the fastest robust lactide ROP catalysts to date, opening new avenues to a sustainable ROP catalyst family for industrial use.
AB - New zinc guanidine complexes with N,O donor functionalities were prepared, characterized by X-Ray crystallography, and examined for their catalytic activity in the solvent-free ring-opening polymerization (ROP) of technical-grade rac-lactide at 150 °C. All complexes showed a high activity. The fastest complex [ZnCl2(DMEGasme)] (C1) produced colorless poly(lactide) (PLA) after 90 min with a conversion of 52 % and high molar masses (Mw=69 100, polydispersity=1.4). The complexes were tested with different monomer-to-initiator ratios to determine the rate constant kp. Furthermore, a polymerization with the most active complex C1 was monitored by in situ Raman spectroscopy. Overall, conversion of up to 90 % can be obtained. End-group analysis was performed to clarify the mechanism. All four complexes combine robustness against impurities in the lactide with high polymerization rates, and they represent the fastest robust lactide ROP catalysts to date, opening new avenues to a sustainable ROP catalyst family for industrial use.
KW - catalysis
KW - guanidine
KW - poly(lactide)
KW - ring-opening polymerization
KW - zinc
UR - http://www.scopus.com/inward/record.url?scp=85029761225&partnerID=8YFLogxK
U2 - 10.1002/cssc.201701237
DO - 10.1002/cssc.201701237
M3 - Article
VL - 10
SP - 3547
EP - 3556
JO - ChemSusChem
JF - ChemSusChem
SN - 1864-5631
IS - 18
ER -