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

Weipeng Liu,Hui Zhao,Fuyan He,Zhizhou Yang,Wenke Yang,Jinshui Yao

doi:10.3390/app9030578

Abstract

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.

Highlights

Over the past few decades, polymer-based materials have rapidly developed and are used wildly in all areas
From PAI3a to PAI3c to PAI3d, the degradation rate gradually slows down. This indicates that for natural chiral amino acids, the rate of degradation decreases as the carbon chain grows
The Tg values are affected by the volume effect of the side groups, the internal plasticizing effect and the isolation are affected by the volume effect of the side groups, the internal plasticizing effect and the effect

Summary

Introduction

Over the past few decades, polymer-based materials have rapidly developed and are used wildly in all areas. Amino acid-based polyamide-imides (PAIs) are a type of high-performance (HP) materials that combine the thermal resistance and mechanical properties of polyimides, and the easy machinability of PA [7,8], as well as having improved degradation properties [9] and cell compatibility [10]. This is due to the introduction of natural chiral sections, which is obviously of great significance for the development of HP, high-processability, and biodegradable polymer materials

Methods

Results

Conclusion