Abstract
Novozyme 435, which is the commercially available immobilized form of Candida antarctica lipase B, has been successfully conducted ring opening polymerization of lactones in organic solvents. In this paper, it was aimed to in... | Find, read and cite all the research you need on Tech Science Press
Highlights
There is a great interest for aliphatic polyesters based on lactone monomers with different ring sizes, such as ε-caprolactone (7-membered) and δ-valerolactone (6-membered) [1,2]
ring opening polymerization (ROP) of δ-VL was performed at varied reaction temperatures and periods via Novozyme 435 (Nov-435) and Im-Candida antarctica Lipase B (CALB)
Highest molecular weight (Mn = 9010 g/mol) for Nov-435 catalyzed ROP was obtained as 40°C and 24 hours (Fig. 1)
Summary
There is a great interest for aliphatic polyesters based on lactone monomers with different ring sizes, such as ε-caprolactone (7-membered) and δ-valerolactone (6-membered) [1,2]. Kobayashi and co-workers applied various lipases (derived from Pseudomonas fluorescens and Candida cylindracea) for the ROP of δ-VL They only reached a maximum molecular weight of 3200 g/mol at the end of a long reaction period (360 hours) by using lipase Candida cylindracea [7]. Cao and colleagues have studied on recombinant technology to produce enzymes with increased thermal tolerance and they reached a maximum molecular weight of ~2225 g/mol in toluene at high temperatures (70-90°C) [4]. These previous studies have shown how hard enzymatic polymerization of δ-VL and the need of searching novel enzyme preparations
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