The Thermal Properties and Degradability of Chiral Polyester-Imides Based on Several l/d-Amino Acids

Abstract

Eight kinds of chiral diacid monomers were prepared with amino acids with different side groups or configurations. Polyester-imides (PEIs) were synthesized from these diacid monomers and diphenol monomers through polycondensation reaction, and the performances and properties were compared with the chiral polyamide-imides (PAIs) previously synthesized by our work group. Their thermal properties were analyzed by thermo gravimetric analysis (TGA) and dynamic thermomechanical analysis (DMA), and it was found that the glass transition temperature (Tg) of PEI was mainly affected by the volume of side groups. Their degradability was studied through buffer degradation experiments, and the changes in their water contact angle, molecular weight, structure and appearance during the degradation process were characterized by contact angle tester, gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). With degradation, the hydrophilicity of PEI was improved, and when amino acids with larger side groups or D configuration were introduced into the backbone of PEI, the degradability decreased.

Ionenes as Potential Phase Change Materials with Self-Healing Behavior

“…The TGA curves showed how the ionenes start a degradative process above 342 • C, losing 5% and 10% of their mass between 360 and 430 • C and between 427 and 484 • C, respectively. These results are consistent with the molecular architecture of the ionenes, which are composed mainly of aromatic groups such as phenyls, aryl-imide and imidazonium rings, as well as ionic groups (NFT 2 counterion and the imidazolium fragment) [40,41]. Thus, it is possible that the ionic groups along the main chain provide additional thermal resistance derived from their strong ionic interactions.…”

Integrated Biotechnology Management of Biosolids: Sustainable Ways to Produce Value—Added Products

“…The demand for plastics is ever increasing due to its application in various fields including packaging, construction, medicine, agriculture, electrical, and automotive. But the detrimental effect of plastics on the environment is massive (Letcher, 2020;Qi et al, 2020). This global issue warrants an eco-friendly alternative for conventional plastic materials.…”

Synthesis and characterization of biodegradable poly(ester‐imide) nanocomposites with L‐alanine, curcumin, and modified rGO

“…One of the most successfully synthesized copolymers is the poly(ester‐imide) copolymer, which in addition to its biodegradability, also has high performance of imide groups. Ester connections contribute to its degradability, while imide groups contribute to its mechanical and thermal properties 10 . Mostly, biocomposite synthesis is based on a biodegradable polymer and environmentally friendly reinforcement.…”

“…Ester connections contribute to its degradability, while imide groups contribute to its mechanical and thermal properties. 10 Mostly, biocomposite synthesis is based on a biodegradable polymer and environmentally friendly reinforcement. Biocompatible and biodegradable nanocomposites can be prepared using amino acidcontaining polymers.…”