1-Butyl-3-methylimidazolium chloride

Catalog NumberACFR79917901

CAS Number79917-90-1

CategoryMain Flame-Retardant ILs

Description	1-Butyl-3-methylimidazolium chloride ionic liquid can be used in flame retardant research on regenerated cellulose.
Synonyms	[BMIM]Cl
Molecular Weight	174.67
Molecular Formula	C8H15ClN2
SMILES	[Cl-].CCCCn1cc[n+](C)c1
InChI	1S/C8H15N2.ClH/c1-3-4-5-10-7-6-9(2)8-10;/h6-8H,3-5H2,1-2H3;1H/q+1;/p-1
InChI Key	FHDQNOXQSTVAIC-UHFFFAOYSA-M
Melting Point	~70 °C
Purity	≥98.0% (HPLC)
Impurity Content	≤1.0% H20
MDL Number	MFCD03095425
Size	5g/50g/250g

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Case Study

1-Butyl-3-methylimidazolium Chloride as a Solvent for Transesterification of Cellulose Toward High Flame Retardancy

Dong, Xinhua, et al. Industrial Crops and Products 216 (2024): 118694.

1-Butyl-3-methylimidazolium chloride ([BMIM]Cl) acts as an effective co-solvent with DMSO for the homogeneous transesterification of cellulose, enabling the introduction of phosphite groups to produce cellulose phosphite ester with significantly enhanced flame retardancy.
Fabrication Process: Microcrystalline cellulose was dissolved in a [BMIM]Cl/DMSO co-solvent system. Dimethyl phosphite (DMP) was added as the acylating reagent with DBU as catalyst. Transesterification was carried out to substitute cellulose hydroxyl groups with phosphite groups, yielding cellulose phosphite ester with varying degrees of substitution (DS).
Performance Evaluation: The cellulose phosphite ester (DS = 0.35) showed a 33.17% increase in char residues compared to unmodified cellulose. Heat release capacity (HRC) decreased dramatically from 296.3 J/g/K (MCC) to 51.6 J/g/K. FT-IR and ³¹P NMR confirmed the presence of P=O, P-O-C and phosphite groups. Higher DS led to increased graphitization of char residues (SEM, Raman), which improved flame retardancy.
Application Significance: [BMIM]Cl provides a green, homogeneous platform for cellulose functionalization, enabling high-value flame-retardant cellulose materials for sustainable applications.

1-Butyl-3-methylimidazolium Chloride as a Solvent for Cellulose/Aromatic Polysulfonamide Blended Fibers with Enhanced Flame Retardancy and Hydrophilicity

Wu, Kaijian, et al. Cellulose 24.8 (2017): 3377-3386.

1-Butyl-3-methylimidazolium chloride ([BMIM]Cl) acts as an effective co-solvent for cellulose and aromatic polysulfonamide (PSA), enabling the preparation of blended fibers with good flame retardancy, improved mechanical properties, and enhanced hydrophilicity via dry-jet wet spinning.
Fabrication Process: Cellulose and PSA (weight ratios 70:30 and 30:70) were dissolved in [BMIM]Cl at 90 °C to form 6 wt% spinning dopes. The solutions were extruded through a spinneret with an air gap of 30 mm, coagulated in water, stretched in water baths, and finally washed in boiling water to obtain blended fibers.
Performance Evaluation: PLM and rheology confirmed complete dissolution of both polymers. Zero-shear viscosity showed positive deviations from log-additivity, indicating strong interaction between cellulose and PSA. The blended fiber with 70 wt% PSA achieved a limiting oxygen index (LOI) of 26.2% and self-extinguished within 2 s after flame removal. Its tenacity (2.6 cN/dtex) and E-modulus (34.2 cN/dtex) were significantly higher than those of washed PSA fiber (0.91 cN/dtex). Contact angle decreased to 64° (vs. 85° for PSA), confirming improved hydrophilicity. LSCM revealed a sheath-core morphology at high PSA content, and XRD showed only cellulose II crystalline structure.
Application Significance: [BMIM]Cl provides a simple, non-toxic route to flame-retardant cellulose/PSA fibers with balanced properties for protective textiles.

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