Abstract
In this paper, Novozyme-435-catalyzed ω-pentadecalactone and ω-pentadecalactone/e-caprolactone polymerizations were investigated. Novozyme-435-catalyzed ω-pentadecalactone polymerizations were studied in bulk and at ω-pentadecalactone-to-toluene ratios from 1:1 to 1:10 (wt/vol). By carrying out polymerizations with ω-pentadecalactone to toluene 1:1 wt/vol instead of in bulk, the monomer conversion (32 to 90%) and product Mn (22 × 103 to 86 × 103 g/mol) increased. Effects of reaction temperature on monomer conversion and product molecular weights also were studied. ω-Pentadecalactone polymerization at 90 °C in toluene (1:2 ω-pentadecalactone to toluene wt/vol) resulted in the fastest kinetics thus far reported for lipase-catalyzed polyester production. However, reduction of the polymerization temperature from 90 to 55 °C gave polypentadecalactone with increased Mn (66 × 103 to 81 × 103 g/mol). Novozyme-435-catalyzed ω-pentadecalactone/e-caprolactone copolymerizations conducted at 70 °C in toluene occurred ...
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