Initiation of ring-opening polymerization of lactide: The effect of metal alkoxide catalyst

2012 ◽  
Vol 995 ◽  
pp. 8-16 ◽  
Author(s):  
Diana Cheshmedzhieva ◽  
Iva Angelova ◽  
Sonia Ilieva ◽  
George S. Georgiev ◽  
Boris Galabov
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Metal Alkoxide

Synthesis and characterization of group 4 metal alkoxide complexes containing imine based bis-bidentate ligands: effective catalysts for the ring opening polymerization of lactides, epoxides and polymerization of ethylene

2015 ◽  
Vol 44 (22) ◽  
pp. 10352-10367 ◽  
Author(s):  
Sagnik K. Roymuhury ◽  
Debashis Chakraborty ◽  
Venkatachalam Ramkumar
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Synthesis And Characterization ◽  
Metal Alkoxide ◽  
Bidentate Ligands ◽  
Group 4 ◽  
Group 4 Metal

A series of group 4 complexes containing imine based bis-bidentate ligands were synthesized and used as catalysts for various polymerizations.

Comparison of Metal Alkoxide Initiators in the Ring-Opening Polymerization of Caprolactone

2012 ◽  
Vol 506 ◽  
pp. 142-145 ◽  
Author(s):  
W. Meelua ◽  
V. Bua-Own ◽  
Robert Molloy ◽  
Winita Punyodom
Keyword(s):  
Rate Constant ◽  
Ring Opening ◽  
Order Rate Constant ◽  
Ring Opening Polymerization ◽  
High Conversion ◽  
Metal Alkoxide ◽  
First Order ◽  
Order Rate

Four metal tert-butoxides, namely: aluminum (III) tert-butoxide, Al (Ot-C4H9)3, tin (II) tert-butoxide, Sn (Ot-C4H9)2, titanium (IV) tert-butoxide, Ti (Ot-C4H9)4, and lithium tert-butoxide, Li (Ot-C4H9), were used as initiators in the bulk ring-opening polymerization (ROP) of ε-caprolactone (CL). The polymerizations were carried out at 120 °C for 72 hrs. It was found that the Al (Ot-C4H9)3 only partially dissolved in the CL monomer and gave a low % conversion. The Li (Ot-C4H9) initiator did not dissolve and gave no polymerization. In contrast, the Sn (Ot-C4H9)2 initiator dissolved completely, albeit very slowly, and gave a high % conversion. The Ti (Ot-C4H9)4 initiator was by far the easiest and quickest to dissolve and also gave a high % conversion. Consequently, Ti (Ot-C4H9)4-initiated polymerization was studied further by dilatometry at 120°C. From the kinetic results, a first-order rate constant, kp, of 0.120 l mol-1 min-1 was obtained.

An efficient strategy for achieving controlled ring-opening polymerization of O-carboxyanhydrides via amine initiation in collaboration with metal-alkoxide catalysis

2018 ◽  
Vol 9 (40) ◽  
pp. 5014-5023 ◽  
Author(s):  
Yanzhao Nie ◽  
Pei Wang ◽  
Haifeng Du ◽  
Wei Meng ◽  
Jing Yang
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Chain Propagation ◽  
Metal Alkoxide ◽  
Efficient Strategy

Amines and Zn(C6F5)2 for polymerization initiation and functionality transfer from Zn(C6F5)2 to a metal-alkoxide species for promoting chain propagation to achieve well controlled ring-opening polymerization of O-carboxyanhydrides.

A Recommender System for Inverse Design of Polycarbonates and Polyesters

2020 ◽  
Author(s):  
Nathaniel Park ◽  
Dmitry Yu. Zubarev ◽  
James L. Hedrick ◽  
Vivien Kiyek ◽  
Christiaan Corbet ◽  
...  
Keyword(s):  
Ring Opening ◽  
High Performance ◽  
Recommendation System ◽  
Polymeric Materials ◽  
Monomer Conversion ◽  
Design Strategy ◽  
Ring Opening Polymerization ◽  
Inverse Design ◽  
False Negatives ◽  
Accelerate Development

The convergence of artificial intelligence and machine learning with material science holds significant promise to rapidly accelerate development timelines of new high-performance polymeric materials. Within this context, we report an inverse design strategy for polycarbonate and polyester discovery based on a recommendation system that proposes polymerization experiments that are likely to produce materials with targeted properties. Following recommendations of the system driven by the historical ring-opening polymerization results, we carried out experiments targeting specific ranges of monomer conversion and dispersity of the polymers obtained from cyclic lactones and carbonates. The results of the experiments were in close agreement with the recommendation targets with few false negatives or positives obtained for each class.<br>

Bisurea and Bisthiourea H-Bonding Organocatalysts for Ring-Opening Polymerization: Cues for the Catalyst Design

2019 ◽  
Vol 52 (23) ◽  
pp. 9232-9237 ◽  
Author(s):  
Rukshika S. Hewawasam ◽  
U. L. D. Inush Kalana ◽  
Nayanthara U. Dharmaratne ◽  
Thomas J. Wright ◽  
Timothy J. Bannin ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Catalyst Design
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