Enzyme-catalyzed preparation of aliphatic polythioester by direct polycondensation of diacid diester and dithiol
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作者:
Kato, Makoto
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Keio Univ, Fac Sci & Technol, Kohoku Ku, Yokohama, Kanagawa 2238522, JapanKeio Univ, Fac Sci & Technol, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan
Kato, Makoto
[1
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Toshima, Kcizunobu
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Keio Univ, Fac Sci & Technol, Kohoku Ku, Yokohama, Kanagawa 2238522, JapanKeio Univ, Fac Sci & Technol, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan
Toshima, Kcizunobu
[1
]
Matsumura, Shuichi
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Keio Univ, Fac Sci & Technol, Kohoku Ku, Yokohama, Kanagawa 2238522, JapanKeio Univ, Fac Sci & Technol, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan
Matsumura, Shuichi
[1
]
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[1] Keio Univ, Fac Sci & Technol, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan
Aliphatic dithiol-diacid type polythioesters were first enzymatically prepared by the direct polycondensation of hexane-1,6-dithiol and diacid diesters using the immobilized lipase from Candida antarctica (lipase CA). As a typical example, diethyl sebacate and hexane-1,6-dithiol were polymerized using lipase CA in bulk in the presence of molecular sieves 4A to produce the corresponding polythioester with an (M) over bar (w) of 10 200 in 90% yield. Both the melting and crystallization temperatures of the produced polythioesters were higher when compared to those of the corresponding polyoxyesters. A higher molecular weight polythioester was produced using lipase in a two-step procedure, i.e., cyclization with subsequent ring-opening polymerization.