Single-Site Catalysts for Ring-Opening Polymerization:  Synthesis of Heterotactic Poly(lactic acid) fromrac-Lactide

1999 ◽  
Vol 121 (49) ◽  
pp. 11583-11584 ◽  
Author(s):  
Ming Cheng ◽  
Athula B. Attygalle ◽  
Emil B. Lobkovsky ◽  
Geoffrey W. Coates
Keyword(s):  
Lactic Acid ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Single Site ◽  
Poly Lactic Acid ◽  
Single Site Catalysts

scholarly journals Synthesis and Characterization of Polyphosphazenes Modified with Hydroxyethyl Methacrylate and Lactic Acid

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Evelyn Carolina Martínez Ceballos ◽  
Ricardo Vera Graziano ◽  
Gonzalo Martínez Barrera ◽  
Oscar Olea Mejía
Keyword(s):  
Lactic Acid ◽  
Ring Opening ◽  
Room Temperature ◽  
Block Structure ◽  
Ring Opening Polymerization ◽  
Synthesis And Characterization ◽  
Poly Lactic Acid ◽  
Hydroxyethyl Methacrylate ◽  
H Nmr

Poly(dichlorophosphazene) was prepared by melt ring-opening polymerization of the hexachlorocyclotriphosphazene. Poly[bis(2-hydroxyethyl-methacrylate)-phosphazene] and poly[(2-hydroxyethyl-methacrylate)-graft-poly(lactic-acid)-phosphazene] were obtained by nucleophilic condensation reactions at different concentrations of the substituents. The properties of the synthesized copolymers were assessed by FTIR,1H-NMR and31P-NMR, thermal analysis (DSC-TGA), and electron microscopy (SEM). The copolymers have a block structure and show twoTg's below room temperature. They are stable up to a temperature of 100°C. The type of the substituents attached to the PZ backbone determines the morphology of the polymers.

Surface-Modified Cellulose Nanofibers-graft-poly(lactic acid)s Made by Ring-Opening Polymerization of l-Lactide

2019 ◽  
Vol 27 (4) ◽  
pp. 847-861 ◽  
Author(s):  
Chaniga Chuensangjun ◽  
Kyohei Kanomata ◽  
Takuya Kitaoka ◽  
Yusuf Chisti ◽  
Sarote Sirisansaneeyakul
Keyword(s):  
Lactic Acid ◽  
Ring Opening ◽  
Cellulose Nanofibers ◽  
Ring Opening Polymerization ◽  
Poly Lactic Acid ◽  
Surface Modified ◽  
Modified Cellulose

Single site catalysts for stereoselective ring-opening polymerization of lactides

2011 ◽  
Vol 2 (3) ◽  
pp. 520-527 ◽  
Author(s):  
Pieter Jelle Dijkstra ◽  
Hongzhi Du ◽  
Jan Feijen
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Single Site ◽  
Single Site Catalysts

Preparation of Anti-Fouling Poly(Lactic Acid)(PLA) Hollow Fiber Membranes via Non-Solvent Induced Phase Separation

2014 ◽  
Vol 884-885 ◽  
pp. 112-116
Author(s):  
Peng Shen ◽  
Kai Tu ◽  
Chang Yu Yang ◽  
Jian Li ◽  
Ru Xu Du
Keyword(s):  
Contact Angle ◽  
Lactic Acid ◽  
Phase Separation ◽  
Block Copolymer ◽  
Water Permeability ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Hollow Fibers ◽  
Poly Lactic Acid ◽  
Bsa Rejection

Anti-fouling PLA hollow fibers were fabricated using synthesized PLA-PEG-PLA copolymer as an additive to improve the hydrophilicity. The tri-block copolymer was prepared by ring-opening polymerization and a hydrophilic copolymer processing good compatibility with PLA molecule was obtained and utilized to fabricate membrane with PLA by NIPS. Elemental analysis showed that PLA-PEG-PLA could stably exist in membranes and endow the membrane with persistent hydrophilic. Thus the contact angle decreased nearly 20o with 5% PLA-PEG-PLA content, resulting in higher water permeability and BSA rejection which indicated the anti-fouling property of PLA membrane was improved.

scholarly journals Microwave energy assisted synthesis of poly lactic acid via continuous reactive extrusion: modelling of reaction kinetics

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18529-18538 ◽  
Author(s):  
Satya P. Dubey ◽  
Hrushikesh A. Abhyankar ◽  
Veronica Marchante ◽  
James L. Brighton ◽  
Björn Bergmann ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Reaction Kinetics ◽  
Ring Opening ◽  
Bimetallic Catalyst ◽  
Batch Process ◽  
Reactive Extrusion ◽  
Ring Opening Polymerization ◽  
Microwave Energy ◽  
Poly Lactic Acid ◽  
Organic Catalysts

The most commonly used batch process to manufacture PLA is ring opening polymerization (ROP) of lactide monomer in a suitable solvent, in the presence of a metallic/bimetallic catalyst (Sn, Zn, and Al) or other organic catalysts.

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