Amorphous sulfur containing biobased polyamides through a solvent- free protocol: Synthesis and scope

• A series of semiaromatic polyamides has been synthetized from eugenol. • A solvent free protocol and an environmentally benign catalyst have been employed. • The influence of the diamine monomer in the properties of PA has been studied. • All the sulfur containing polyamides were amorphous with a wide range of Tg values. • The prepared biobased materials have good thermal and dimensional stability. In this study a series of sulfur containing semi-aromatic polyamides has been successfully synthetized employing the biobased compound eugenol as starting material. The so-obtained polymers have been characterized through various techniques, including Nuclear Magnetic Resonance (NMR), Fourier Transform Infrared Spectroscopy (FT-IR) and Gel Permeation Chromatography (GPC). Furthermore, the thermal properties of the synthesized polyamides have been studied by means of Differential Scanning Calorimetry (DSC) and Thermal Gravimetric Analysis (TGA) providing valuable insights into their potential applications and performance under varying conditions. Moreover, it has been demonstrated the great influence of the diamine counterpart not only in the success of the polymerization reaction but also in the properties of the synthetized polymers. The obtained materials have demonstrated excellent thermal stability, dimensional integrity and favorable processing properties.