Formation of Reactant Complex Structure for Initiation Reaction of Lactone Ring-Opening Polymerization by Cooperation of Multiple Cyclodextrin

2016 ◽  
Vol 120 (29) ◽  
pp. 7174-7181 ◽  
Author(s):  
Masayoshi Takayanagi ◽  
Shoko Ito ◽  
Kentaro Matsumoto ◽  
Masataka Nagaoka
Keyword(s):  
Ring Opening ◽  
Lactone Ring ◽  
Complex Structure ◽  
Ring Opening Polymerization ◽  
Initiation Reaction

Chemical synthesis of novel biodegradable polyesters

1995 ◽  
Vol 41 (13) ◽  
pp. 282-288 ◽  
Author(s):  
Y. Hori ◽  
Y. Takahashi ◽  
A. Yamaguchi ◽  
T. Hagiwara
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Lactone Ring ◽  
Ring Opening Polymerization ◽  
Optically Active ◽  
Bond Breaking ◽  
Carbonyl Carbon ◽  
Biodegradable Polyesters ◽  
Molecular Weights ◽  
High Molecular Weight Poly

Distannoxane complexes catalyze the ring-opening polymerization of optically active β-butyrolactone (β-BL) to afford a high molecular weight poly(3-hydroxybutyrate). When 1-ethoxy-3-chlorotetrabutyldistannoxane was used as a catalyst (catalyst/(R)-β-BL = 1/8000 at 100 °C for 4 h), poly((R)-3-hydroxybutyrate) was obtained from (R)-β-BL in a yield of 99%. The copolymerizations of (R)-β-BL with racemic β-BL in several ratios gave corresponding stereocopolymers. The copolymerizations of (R)-β-BL with ε-caprolactone, δ-valerolactone, β-methyl-δ-valerolactone, and L-lactide afforded novel optically active and biodegradable polyesters of high molecular weights, comprising (R)-3-hydroxybutyrate (3HB). The polymerization of (R)-β-BL catalyzed by the distannoxane complexes proceeded by bond breaking between the carbonyl carbon and oxygen atom of the lactone ring (acyl cleavage) with retention of the configuration and little or no racemization. Polymers that have over 80 mol% of the (R)-3HB unit were found to have almost the same degree of biodegradability as the copolyester of 3-hydroxybutyrate and 11% 3-hydroxyvalerate produced by the microbial method.Key words: distannoxane, ring-opening polymerization, poly(3-hydroxybutyrate), poly(3-hydroxyalkanoates), biodegradable polymer.

Ethyl Glucoside as a Multifunctional Initiator for Enzyme-Catalyzed Regioselective Lactone Ring-Opening Polymerization

1998 ◽  
Vol 120 (7) ◽  
pp. 1363-1367 ◽  
Author(s):  
Kirpal S. Bisht ◽  
Fang Deng ◽  
Richard A. Gross ◽  
David L. Kaplan ◽  
Graham Swift
Keyword(s):  
Ring Opening ◽  
Lactone Ring ◽  
Ring Opening Polymerization

scholarly journals Synthesis of poly(disulfide)s with narrow molecular weight distributions via lactone ring-opening polymerization

2020 ◽  
Vol 11 (19) ◽  
pp. 4882-4886
Author(s):  
Sungwhan Kim ◽  
Kamila I. Wittek ◽  
Yan Lee
Keyword(s):  
Molecular Weight ◽  
Ring Opening ◽  
Lactone Ring ◽  
Ring Opening Polymerization ◽  
Controlled Polymerization ◽  
Molecular Weight Distributions ◽  
Weight Distributions

We report the first example of controlled polymerization of poly(disulfide)s with narrow molecular weight distributions.

Studies on the Ring-Opening Polymerization of Cyclic Ethers. Kinetics of Initiation Reaction by Triethyloxonium Tetrafluoroborate

1973 ◽  
Vol 6 (5) ◽  
pp. 657-660 ◽  
Author(s):  
Takeo Saegusa ◽  
Yoshiharu Kimura ◽  
Hiroyasu Fujii ◽  
Shiro Kobayashi
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Cyclic Ethers ◽  
Initiation Reaction ◽  
Kinetics Of

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>

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