Maniar, Dina published the artcileEnzymatic synthesis and characterization of muconic acid-based unsaturated polymer systems, Synthetic Route of 627-93-0, the publication is Polymer International (2021), 70(5), 555-563, database is CAplus.
The design of unsaturated aliphatic (co)polyester systems, based on different diester-modified muconic acid isomers, was performed via an eco-friendly pathway by utilizing enzymic polymerization using Candida antarctica lipase B (CALB) as catalyst. The obtained fully unsaturated oligoesters and polyesters reached lower mol. weights from 2210 to 2900 g mol-1 for the cis,cis-(Z,Z)-muconate isomer, and higher mol. weights of up to 21 200 g mol-1 for the polymers with cis,trans-(Z,E) isomeric structures. The obtained (co)polyesters were thoroughly characterized and compared with their saturated polyester analogs. The applied biobased catalyst Novozym435 (an immobilized form of CALB) showed higher selectivity towards the open cis,trans-muconate compared to the more closed-structure cis,cis-muconate. Anal. of 1H NMR anal. showed that alkene functionality is present, and no stereo conformational changes were detected in the resulting polymers. The thermal properties of the muconate-based polyesters showed a glass transition between -7 and 12°C, and a one-step degradation process with a maximum rate of weight loss between 415 and 431°C, depending both on the conformation of the applied diester derivatives and on the segment lengths of the polyoxyalkylenes. Mass spectrometric anal. of the resulting saturated and unsaturated polyesters revealed five different microstructures with different terminal end groups, such as ester/hydroxyl, acid/ester, ester/ester and acid/hydroxyl, and cyclic polyesters without functional end groups. Overall, this study demonstrates that enzymic polymerization is a robust approach for the synthesis of unsaturated polyesters.
Polymer International published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Synthetic Route of 627-93-0.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics