title: High-molecular-weight polycarbonates synthesized by enzymatic ROP of a cyclic carbonate as a green process.
abstract: High-molecular-weight PTeMC and PHMC were prepared by the lipase-catalyzed polymerization of butane-1,4-diol or hexane-1,6-diol and diphenyl carbonate via the formation of a cyclic dimer by a green process. Cyclic carbonate dimers were prepared by the lipase-catalyzed condensation of diphenyl carbonate with butane-1,4-diol or hexane-1,6-diol in dilute toluene solution using an immobilized lipase from Candida antarctica, and was followed by the ring-opening polymerization of the cyclic dimer in bulk with the same lipase to produce PTeMC with M(w) = 119 000 g . mol(-1) and PHMC with M(w) = 399 000 g . mol(-1), respectively. Additionally, enzymatic polymerization of cyclic carbonate dimer was analyzed with respect to the K(m) and V(max) for the lipase.
authors: Department of Applied Chemistry, Keio University, Kohoku-ku, Yokohama 223-8522, Japan.
authors: Yoshio
authors: Y
authors: Yamamoto
authors: Sachiko
authors: S
authors: Kaihara
authors: Kazunobu
authors: K
authors: Toshima
authors: Shuichi
authors: S
authors: Matsumura
mesh_terms: D002073:Butanes / Q000737:chemistry; D002254:Carbonates / Q000737:chemistry / Q000378:metabolism; D019281:Dimerization; D005656:Fungal Proteins / Q000378:metabolism*; D055772:Green Chemistry Technology / Q000379:methods*; D008049:Lipase / Q000378:metabolism*; D015394:Molecular Structure; D008970:Molecular Weight; D011076:Polycarboxylate Cement / Q000138:chemical synthesis / Q000737:chemistry
chemical_list: D002073:Butanes; D002254:Carbonates; D005656:Fungal Proteins; D011076:Polycarboxylate Cement; C005506:polycarbonate; C046888:butane; D008049:Lipase; C431349:lipase B, Candida antarctica