Ring opening polymerization of lactones

Enzyme activity for the polymerization of lactones was improved by the immobilization on Celite [93]. Immobilized lipase PF adsorbed on a Celite showed much higher catalytic activity than that before the immobilization. The catalytic activity was further enhanced by the addition of a sugar or poly(ethylene glycol) in the immobilization. Surfactant-coated lipase efficiently polymerized the ring-opening polymerization of lactones in organic solvents [94]. [Pg.250]

An alcohol could initiate the ring-opening polymerization of lactones by lipase catalyst ( initiator method ). In the lipase CA-catalyzed polymerization of DDL using 2-hydroxyethyl methacrylate as initiator, the methacryloyl group was quantitatively introduced at the polymer terminal, yielding the methacryl-type polyester macromonomer [98]. This methodology was expanded to synthesis of co-alkenyl- and alkynyl-type macromonomers by using 5-hexen-l-ol and 5-hexyn-l-ol as initiator. [Pg.253]

Table 2 Ring-opening polymerization of lactones initiated by lanthanide complexes (CL = e-caprolactone LA = lactide TMC = trimethylene carbonate). [Pg.50]

Aluminum Alkoxides Mediated Ring Opening Polymerization of Lactones and Lactides... [Pg.6]

Lofgren A, Albertsson AC, Dubois P, Jd6me R (1995) Recent advances in ring opening polymerization of lactones and related compounds. JMS Rev Macromol Chem Phys... [Pg.56]

Hamitou A, Jerome R, Hubert AJ, Teyssie P (1973) A new catalyst for the ring-opening polymerization of lactones to polyesters. Macromolecules 6 651-652... [Pg.209]

Save M, Schappacher M, Soum A (2002) Controlled ring-opening polymerization of lactones and lactides initiated by lanthanum isopropoxide, 1 general aspects and kinetics. Macromol Chem Phys 203 889-899... [Pg.210]

Nomura N, Taira A, Tomioka T, Okada M (2000) A catalytic approach for cationic living polymerization Sc(OTf)3-catalyzed ring-opening polymerization of lactones. Macromolecules 33 1497-1499... [Pg.210]

Casas J, Persson PV, Iversen T, Cordova A (2004) Direct organocatalytic ring-opening polymerizations of lactones. Adv Synth Catal 346 1087-1089... [Pg.212]

Uyama H, Kobayashi S (1993) Enzymatic ring-opening polymerization of lactones catalyzed by lipase. Chem Lett 1149-1150... [Pg.213]

Ring-Opening Polymerization of Lactone with Aluminum... [Pg.40]

Ring-Opening Polymerization of Lactone with Aluminum Porphyrin in the Presence of a Lewis Acid [73]... [Pg.97]

In the present study, the novel concept of the Lewis acid assisted living polymerization with the aluminum porphyrin-methylaluminum diphenolate (3) system was successfully extended from the accelerated living addition polymerization of alkyl methacrylates to the accelerated living ring-opening polymerizations of lactones. [Pg.98]

Abstract. This paper reviews ring-opening polymerization of lactones and lactides with different types of initiators and catalysts as well as their use in the synthesis of macromolecules with advanced architecture. The purpose of this paper is to review the latest developments within the coordination-insertion mechanism, and to describe the mechanisms and typical kinetic features. Cationic and anionic ring-opening polymerizations are mentioned only briefly. [Pg.41]

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