Preparation and characterization of bio⁃based furan polyamide by interfacial polymerization

doi:10.19491/j.issn.1001-9278.2025.04.003

Abstract

Abstract:

A series of furan⁃based polyamides （PAXFs）， including poly（tetramethylene furanamide）（PA4F）， poly（hexamethylene furanamide）（PA6F）， and poly（octamethylene furanamide）（PA8F）， were synthesized using 2，5⁃furandiformyl chloride and aliphatic diamines （C=4，6，8） as raw materials through interfacial polymerization. The characterization results obtained from FTIR， NMR and GPC tests confirmed the successful preparation of PAXFs with a high molecular weight. DSC and XRD analysis results indicated that PA4F was a semi⁃crystalline polyamide， whereas PA6F and PA8F were amorphous polyamides. This result may be due to the interaction between the furan ring and furan ring in the molecular chain as well as the coplanar structure of the furan ring and butylamine units， which resulted in a more regular molecular chain and a higher crystallinity degree of PA4F. TGA and UV⁃vis spectroscopy characterization results indicated that PAXFs had good heat resistance and transparency， and its maximum thermal decomposition temperature and transmittance at 760 nm of UV visible light reached 450 ℃ and 91.1 %， respectively.

Key words: 2, 5-furandiformyl chloride, biobased furan polyamide, interfacial polymerization

CLC Number:

TQ323.6

HOU Like, ZHAO Shikun, ZHAO Biao, GUO Hongyuan, DENG Jianping, PAN Kai. Preparation and characterization of bio⁃based furan polyamide by interfacial polymerization[J]. China Plastics, 2025, 39(4): 14-19.

Figures/Tables 10

Fig.1. Synthesis reaction equation of PAXFs

Fig.2. Research on the influence of PA6F synthesis factors

Fig.3. FTIR spectra of PAXFs

Fig.4. 1H⁃NMR and 13C⁃NMR spectra of PAXFs

Fig.5. Molecular weight， GPC spectra， relative viscosity， and molecular weight distribution width curve of PAXFS

样品	M_n /g·mol^-1	M_w /g·mol^-1	PDI	η_r	产率/%	T_g/℃	T_m/℃	T_c/℃	T_d⁃max/℃
PA4F	15 800	35 900	2.27	2.13	81.49	158	286	209	431
PA6F	15 200	37 600	2.47	2.10	88.73	138	-	-	445
PA8F	12 700	34 400	2.70	1.92	91.85	121	-	-	450

Tab.1. Molecular weight and thermal properties of PAXFs

Fig.6. DSC curves of PAXFs

Fig.7. TG curves of PAXFs

Fig.8. XRD spectra of PAXFs

Fig.9. Electronic photo image and UV⁃vis transmission spectra of PAXFS

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