AI Article Synopsis
- Nylon 514 is a new type of bio-based nylon made from 1,5-pentanediamine (PDA) sourced from biomass, involving efficient crystallization processes to create the high-performance monomer PDA-TDA.
- Two crystal forms of PDA-TDA, anhydrous and dihydrate, were analyzed for their crystal structures and thermal behaviors, with a focus on how intermolecular interactions, like hydrogen bonds, contribute to stability.
- The study established how temperature and water activity affect the structural stability of these forms, leading to the creation of nylon 514 with excellent thermal stability and low absorption properties.
Article Abstract
Nylon 514 is one of the new long-chain bio-based nylon materials; its raw material, 1,5-pentanediamine (PDA), is prepared by biological techniques, using biomass as the raw material. The high-performance monomer of nylon 514, 1,5-pentanediamine-tetradecanedioate (PDA-TDA) salt, was obtained through efficient crystallization methods. Here, two crystal forms of PDA-TDA, anhydrous and dihydrate, were identified and studied in this paper. From the characterization data, their crystal structures and thermal behaviors were investigated. Lattice energy was calculated to gain further insight into the relationship between thermal stability and crystal structures. The contribution of hydrogen bonds and other intermolecular interactions to the crystal structure stability have been quantified according to detailed Hirshfeld and IRI analyses. Additionally, the transformation mechanism of the anhydrate and dihydrate was established through a series of well-designed stability experiments, in which the temperature and water activity play a significant role in the structural stability of crystalline forms. Eventually, we obtained nylon 514 products with good thermal stability and low absorption using stable dihydrate powders as monomers. The properties of nylon 514 products prepared by different polymerization methods were also compared.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10892662 | PMC |
| http://dx.doi.org/10.3390/polym16040480 | DOI Listing |
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