Stability and spinnability of modified melamine–formaldehyde resin solution for centrifugal spinning

Abstract

Melamine microfibers were first prepared by centrifugal spinning. The stability and spinnability of a melamine-formaldehyde (MF) resin solution were improved as expected by adding various modifier combinations. Considering the storage stability of solutions characterized by visual inspection, turbidity tests, and viscosity measurements and combined with the fiber morphology, the optimal modifier combination was obtained. The spun fibers manifested a good morphology and thermal stability as measured by scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Moreover, microfibers prepared by three spinning methods (centrifugal spinning, electrospinning, and centrifugal electrostatic spinning) were compared to choose the suitable spinning method for different fields in the future. This work provides systematic and scientific guidance on the synthesis of MF resin solutions and rapid mass production of melamine microfibers and also demonstrates that centrifugal spinning of melamine microfiber is a promising candidate for flame retardance and CO 2 adsorption at elevated temperature. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46072.

Influence of Polymer Concentration and Nozzle Material on Centrifugal Fiber Spinning

“…According to several published studies, the fiber morphology depends on the polymer concentration, molecular weight, centrifugal speed, collector distance, and nozzle diameter [26][27][28][29]. Even though the centrifugal spinning technique has attracted a lot of interest, and the number of publications has increased tremendously due to its simplicity and its ability to produce fibers at a large scale, control over the fiber morphology remains the major limitation to upscaling [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. In this contribution, we investigate the role of both concentration-dependent variation in shear viscosity and the choice of nozzle material on the fiber morphology.…”

Preparation of melamine–formaldehyde resin grafted by (3‐aminopropyl) triethoxysilane for high‐performance hydrophobic materials

“…The stretching vibration band at 2951 cm −1 was belonged to CH 2  group, the bands at 1563, 1504, and 811 cm −1 were assigned to the vibration of triazine rings in melamine . The stretching vibration band at 1165 and 1004 cm −1 was attributed to CO and COC of methylene ether linkage . The band at 1068 cm −1 corresponded to the SiOC 2 H 5 group of APTES, indicated that APTES was introduced into the MF resin.…”

“…A sharp loss of weight was found in the region of 350 to 450 °C which corresponded to the degradation and breakdown of the triazine ring of melamine . The last weight loss above 450 °C corresponded to the extensive thermal degradation of MF material and HCN, CO, and CO 2 were produced …”

“…It is generally known that MF materials are of excellent flame resistance and mechanical performance . MF resin is used for a wide variety of industrial applications, such as adhesives for wood, coatings, fibers, laminates, MF foamings, microcapsules, fire retardants, catalysis materials, and electrode materials; however, some performance deficiencies inhibit its applications. Due to the presence of numerous active groups, such as secondary amino group (NH) and methylol group (CH 2 OH), the viscosity of MF resin increases gradually during storage which is caused by the continue condensation of methylol melamine prepolymers.…”

Preparation and properties of melamine formaldehyde resin modified by functionalized nano-SiO2 and polyvinyl alcohol

“…7 -9 However, the low compatibility between MF resin and PVA at room temperature will always result in phase separation, thereby reducing the mechanical properties of the prepared material. 10 Therefore, the MF/PVA composite fiber must be produced as soon as the MF prepolymer/PVA blend is prepared; 11 to increase its toughness (the elongation at break > 30%), relatively large volumes (50 wt%) of PVA must be used as raw materials. 9 Yu et al investigated the effect of the multiphase structure of the MF/PVA blend system on the properties of MF/PVA composite fiber.…”