Thermal properties and enzymatic degradation of PBS copolyesters containing dl-malic acid units.

Huashan Wang, Kaiyue Liu, Xing Chen, Meiyi Wang

Chemosphere 2021 Jun

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A series of biodegradable copolyester of poly (butylene succinate-co-butylene malate) (P (BS-co-BM)) bearing hydroxyl groups were prepared by one-pot synthetic strategy without hydroxy-protection. The structure and properties of the P (BS-co-BM) were characterized by nuclear magnetic resonance (1H NMR), thermogravimetry analysis (TGA), differential scanning calorimetry (DSC), polarized optical microscope (POM), contact angle tester and enzymatic degradation. The results showed that the P (BS-co-BM) manifested excellent thermal properties. The glass transition temperature (Tg) of the P (BS-co-BM) increased with malic acid units added, the crystallizability temperature (Tc) decreased from 72.6 °C to 21.7 °C, and the melting point temperature (Tm) decreased from 117.9 °C to 82.4 °C. The crystallization rate of poly(butylene succinate) (PBS) segment within P (BS-co-BM) was improved by the introduction of malic acid. The enzymatic degradation rate increased with hydrophilicity of the copolyester improving. Copyright © 2021 Elsevier Ltd. All rights reserved.

Citation

Huashan Wang, Kaiyue Liu, Xing Chen, Meiyi Wang. Thermal properties and enzymatic degradation of PBS copolyesters containing dl-malic acid units. Chemosphere. 2021 Jun;272:129543