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Appl. Sci. 2019, 9(3), 578;

Study on the Thermal Properties and Enzymatic Degradability of Chiral Polyamide-Imides Films Based on Amino Acids

School of Materials Science & Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
Shandong Provincial Key Laboratory of Processing & Testing Technology of Glass and Functional Ceramics, Jinan 250353, China
Institute of Fundamental Sciences and Frontiers, University of Electronic Sceinces and Technology of China, Chengdu 610054, China
Author to whom correspondence should be addressed.
Received: 29 December 2018 / Revised: 30 January 2019 / Accepted: 2 February 2019 / Published: 10 February 2019
(This article belongs to the Special Issue Advances in Polyimide Films: Preparation, Properties and Applications)
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Six kinds of chiral polyamide-imides (PAI3a–3f) have successfully been synthesized via direct polycondensation. The thermal properties of the materials were evaluated by the gravimetric analysis (TGA) and differential scanning calorimetry (DSC). A thermal test was conducted and showed that the polymers have good thermal stability. The Tg values were affected by the volume effect of the side groups, the internal plasticizing effect and the isolation effect. Polyamide-imides (PAIs) with L configuration showed higher Tg values than PAIs with D configuration. In the enzymatic degradation experiments of PAI films, the results showed that the structure of amino acids have the greatest influence on the degradation performance of PAIs relative to chirality. The PAI films with simple side groups and L configurations were easier to degrade. The degradation rate of natural chiral PAIs were higher than those of non-natural chiral PAIs. This makes it possible to develop polymer materials with specific degradation rates. View Full-Text
Keywords: polyamide-imides (PAIs); degradability; amino acids; glass transition temperature (Tg) polyamide-imides (PAIs); degradability; amino acids; glass transition temperature (Tg)

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Liu, W.; He, F.; Yang, W.; Yang, Z.; Yao, J.; Zhao, H. Study on the Thermal Properties and Enzymatic Degradability of Chiral Polyamide-Imides Films Based on Amino Acids. Appl. Sci. 2019, 9, 578.

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