Enzymatic Degradation of the Copolyester P(BS-co-DGS)

Abstract:

Lipase Novozym 435 was used as catalyst to degrade P(BS-co-DGS), which was a kind of PBS-based copolyester modified with diethylene glycol (DEG), in a THF/toluene mixed solvent system. P(BS-co-DGS) copolyesters were synthesized by copolymerization and characterized by ¹H NMR. GPC and TGA were used to investigate average molecular weight and thermal property before and after degradation, respectively. After degraded by N435 for 30 h, the M_n of P(BS-co-DGS)10 (DEG content 10%) decreased from 8.33×10⁴ to 3.52×10⁴ g·mol^-1 with some yellow oil droplets of oligomers appearing. And the initial decomposition temperature (the temperature at 5% mass loss) of P(BS-co-DGS)10 changed from 300.6 to 178.9. MALDI-TOF-MS results showed that none of DEG oligomers appeared in P(BS-co-DGS)10 degradation products. However, when the DEG content increased to 20%, there were the DEG circle oligomers as well as linear oligomers in the degradation products.

• Periodical: Materials Science Forum (Volumes 743-744)
• Pages: 649-654
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.743-744.649
• Online since: January 2013
• Authors: Ying Zhao, Min Zhang, Ming Ming Shang, Dan He, Jian Hui Qiu
• Keywords: Circle Oligomer, Enzymatic Degradation, Linear Oligomer, P(BS-co-DGS)

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