Synthesis of spinnable melamine formaldehyde resin prepolymer using ionic liquid and performance regulation of melamine fibers

Abstract

In order to address the poor spinnability of melamine formaldehyde (MF) resin spinning dope, 1-ethyl-3-methylimidazolium diethylphosphate ([Emim]DEP)/H 2 O solution is first used as the solvent to synthesize MF resin prepolymer (pre-MF) solution. The pre-MF solution can be directly spun into fibers without any fiberforming agent. The influence of synthetic parameters, such as reaction time and temperature, the mass ratio of [Emim]DEP to H 2 O, and solid content, on the fiber properties are investigated systematically. The results show that [Emim] DEP demonstrates a key role in regulating the molecular weight and distribution of pre-MF solution, which plays transfer catalyst effect during the synthesis process. Furthermore, programmed heating is the most helpful for the linear growth of the molecular in the initial stage of curing and the formation of the final cross-linked structure. The fibers obtained under optimal conditions have excellent mechanical properties, with fracture strength of 323.8 MPa and elongation at break of 7.2%. This work provides a novel synthesis method of pre-MF solution to prepare high-performance MF fibers.

Effortless impregnation method for melamine formaldehyde foams exhibiting elevated thermal stability and exceptional flame retardant characteristics

“…Melamine-formaldehyde (MF) resin is a typical thermosetting amino resin extensively utilized in adhesives, coatings, fibers, foam plastics, leather tanning agents, decorative laminates, molding compounds, and other products, owing to its desirable features including excellent physicchemical stability, good weather resistance, satisfactory adhesion to various substrates, high hardness and stiffness, low flammability, good optical performance, and lowcost. [1][2][3] In addition, MF resin is widely applied to prepare foam products. For instance, the researchers have exploited MF to shell materials for microcapsules containing self-healing agents, flame retardant, electronic ink display technique, and phase change materials.…”