Publisher DOI: 10.1021/acs.oprd.6b00418
Title: Enzyme- and metal-catalyzed synthesis of a new biobased polyester
Language: English
Authors: Gebhard, Jakob 
Neuer, Björn 
Luinstra, Gerrit A. 
Liese, Andreas  
Issue Date: 9-Aug-2017
Publisher: American Chemical Society
Source: Organic Process Research and Development 9 (21): 1245-1252 (2017-09-15)
Journal or Series Name: Organic process research & development 
Abstract (english): Linear aliphatic polyesters were prepared from Pripol 1012, a diacidic C18 fatty acid dimer, and 1,3-propanediol employing a lipase or a titanium tetrabutanoate. Metal-based catalysis (route M) was carried out with a precondensation at 180 °C and 600 mbar followed by a final condensation at 220 °C and 0.3-0.6 mbar. Enzyme catalysis was carried out with an immobilized Candida antarctica lipase B after either a precondensation step at 180 °C and 600 mbar (route E1) or 80 °C and 100 mbar (route E2) and a final condensation at 80 °C and 0.3-0.6 mbar. Polyesters were obtained along routes M, E1, and E2 with weight-average molecular weights, Mw, at final conversion of 84.6, 26.7, and 15.6 kg mol-1, respectively. The final molecular weight via route E2 was most probably constrained by depletion of 1,3-propanediol during precondensation. Rheological measurements of the polyesters in melt revealed a Newtonian-like behavior at 80 °C. The dynamic viscosities fulfill the Cox-Merz rule. The power law for the viscosity as a function of Mw possesses an exponent of 3.7 ± 0.2. A polyesterdiol of Mn ≈ 6 kDa prepared along route M was used in the synthesis of a polyurethane elastomer with a Young modulus of 2.5 MPa, an elongation at break of 554%, an ultimate tensile strength of 3.5 MPa, and a Shore A hardness of 38.
URI: http://hdl.handle.net/11420/3165
ISSN: 1083-6160
Institute: Technische Biokatalyse V-6 
Type: (wissenschaftlicher) Artikel
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