Phenolic fibers are cross-linked fibers made from phenolic resins, which are extremely heat-resistant. As a fiber solutions provider, Alfa Chemistry offers phenolic fibers to meet your heat resistant fiber requirements.
Features
- Excellent flame retardancy, limiting oxygen index 30 ~ 34
- Excellent heat resistance (instantaneous resistance to 2500 °C, long-term use temperature of 150-180 °C)
- Excellent thermal insulation
- Excellent chemical resistance
- Elongation of 30% ~ 70%
- Moisture regain of 6%
- Good UV stability
Structure
Phenolic fiber refers to the cross-linked fiber made of novolac phenolic resin or thermosetting phenolic resin, and the flame-retardant organic fiber formed by acetalization or complexation. Studies have shown that the structure of the phenolic novolac precursor resin affects the structure and properties of the resulting phenolic fibers. Influencing factors include the weight-average molecular weight (Mw) and the ortho/para (O/P) ratio of the phenolic resin, among others. Phenolic fibers made from phenolic precursor resins with high weight average molecular weight and low O/P values have high tensile strength and good flame-retardant features. [1]
TG-MS diagram of phenolic fiber [2]
Applications
Phenolic fibers are versatile materials, with applications such as fire and thermal insulation, chemical-resistant textiles, noise-reduction materials, friction materials, composites, advanced aerospace insulation, precursor of carbon fibers and activated carbon. In addition, it has been reported that the brittleness of electrospun phenolic fibers changed greatly after curing and carbonization. Most applications of cured and carbonized phenolic fibers are based on large surface area, good absorption, high porosity, electrical conductivity and flexibility. Therefore, they are more suitable as adsorbent materials, non-conductive materials and flexible materials. [3]
Research Information
Dongqing Zhang et al. successfully adjusted the hollowness of the cross-linked hollow phenolic fibers from 9% to 80% by adjusting the curing temperature of the partially cross-linked fibers. In this work, the cross-sectional structures of these hollow fibers are symmetrical, flawless, and dense, indicating that these hollow fibers have high and uniform cross-linking. In addition, the hollow phenolic fibers were finally transformed into hollow carbon fibers after heat treatment in an inert atmosphere, and the fracture positions and formed molecules are shown in Figure. [4]
References
- Yong-Gang Ying, et al. Materials Chemistry and Physics, 2013, 143, 1, 455-460.
- Chun-Ling Liu, et al. Materials Science and Engineering: A, 2007, 459, 1–2, 347-354.
- Xie, Gai, et al. Materials Science Forum, 2015, 815, 638–642.
- Dongqing Zhang, et al. Fibers and Polymers, 2012, 13, 495–500.
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