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Direct Solid-State Polymerization of Highly Aliphatic PA 1212 Salt: Critical Parameters and Reaction Mechanism
Angeliki D Mytara1, Athanasios D Porfyris1,2, Constantine D Papaspyrides1
1Laboratory of Polymer Technology, School of Chemical Engineering, National Technical University of Athens, Zographou Campus, 157 80 Athens, Greece.
Polymers
|January 10, 2026
Summary
This study synthesized polyamide 1212 (PA 1212) using direct solid-state polymerization (DSSP). The hydrophobic nature of PA 1212 salt leads to a modified solid-melt transition mechanism during polymerization.
Area of Science:
- Polymer Chemistry
- Materials Science
Background:
- Direct solid-state polymerization (DSSP) of polyamide salts typically follows a solid-melt transition (SMT) mechanism.
- Polyamide 1212 (PA 1212) salt's hydrophobic nature is expected to alter this established SMT mechanism.
Purpose of the Study:
- To synthesize PA 1212 via DSSP from its solid salt precursor.
- To investigate the influence of hydrophobicity on the DSSP mechanism of PA 1212 salt.
- To characterize the polymerization process and resulting material properties.
Main Methods:
- Microscale investigation using thermo-gravimetric analysis (TGA).
- Laboratory-scale synthesis examining reactor design, temperature, and residence time.
- Characterization of molecular size and morphology using Scanning Electron Microscopy (SEM).
- Development of a Fourier Transform Infrared Spectroscopy-Attenuated Total Refraction (FTIR-ATR) protocol for monitoring polymerization.
Main Results:
- DSSP of PA 1212 salt proceeds through a quasi-SMT mechanism, deviating from the classical model.
- Hydrophobicity of the PA 1212 salt influences surface softening and agglomeration phenomena.
- FTIR-ATR provided a novel method for qualitative monitoring of polymerization progress.
Conclusions:
- The hydrophobic structure of PA 1212 salt significantly impacts its DSSP behavior.
- The observed deviations from the classical SMT mechanism are attributed to the salt's inherent hydrophobicity.
- This research offers insights into tailoring DSSP processes for hydrophobic polyamide precursors.
Keywords:
FTIR-ATRdirect solid-state polymerizationlong-chain aliphatic polyamidespolyamide synthesissolid-melt transition (SMT)More Related Videos
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