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Lipase‐Catalyzed Ring‐Opening Polymerization of Molecularly Pure Cyclic Oligomers for Use in Synthesis and Chemical Recycling of Aliphatic Polyesters
Author(s) -
Kondo Asato,
Sugihara Satoko,
Kuwahara Maiko,
Toshima Kazunobu,
Matsumura Shuichi
Publication year - 2008
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/mabi.200700270
Subject(s) - polyester , polymerization , chemistry , catalysis , ring opening polymerization , polymer chemistry , lipase , ring (chemistry) , chain transfer , oligomer , organic chemistry , polymer , radical polymerization , enzyme
The lipase‐catalyzed ROP of molecularly pure cyclic oligomers with a definite degree of oligomerization is analyzed with respect to the molecular weights of the resulting polymers and certain kinetic parameters of the enzymatic reaction. Cyclic BA dimers, trimers, and tetramers polymerize faster than the equivalent monomer; however, the latter produces PBA of significantly higher molecular weight. The reason is that the ring opening of the cyclic monomer is slow, leading to a lower initiator concentration than that produced by the cyclic BA dimer and trimer. Similarly, the cyclic BS dimer produces PBS of higher molecular weight than that obtained from the cyclic BS trimer.