AI Article Synopsis
- Researchers synthesized comb-like polymers called N-hexadecylated polycaprolactam (PA6C16) through N-alkylation, varying the degree of alkylation.
- Thermal analysis using differential scanning calorimetry (DSC) showed that while hexadecyl side chains can crystallize, higher degrees of alkylation resulted in lower melting points.
- Fourier transform infrared spectroscopy (FTIR) indicated different crystallization forms for the side chains based on alkylation degree, with PA6C16-H showing a conformational transition in its backbone during melting, unlike PA6C16-L.
Article Abstract
N-hexadecylated polycaprolactam (PA6) comb-like polymers (PA6C16) with different alkylation degree, were synthesized using the method of N-alkylation reaction. The thermal transition behavior of these polymers were characterized by a combination of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). DSC results indicated that the hexadecyl side chain can crystallize. Furthermore, the melting point of the hexadecyl side chain crystallization of the sample with high alkylation degree(PA6C16-H) is lower than that of sample with lower alkylation degree(PA6C16-L). FT-IR spectroscopic results showed that the methylene groups of the hexadecyl side chain of PA6C16-L tend to crystallize in orthorhombic form, while the methylene groups of the hexadecyl side chain of PA6C16-H tend to be packed into hexagonal form. Variable temperature IR spectroscopic results revealed that accompanying the melting of the side chain crystallization, the backbones of PA6C16-H undergo a conformation transition, while the conformation of backbones of PA6C16-L shows no obvious transition.
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