Fabricating flame retardant polyacrylonitrile fibers modified by sodium lignosulfonate and copper ions. (December 2022)

• Record Type: Journal Article
• Authors: Guo, Yingbin; Zuo, Chunlong; Tan, Wei; Liu, Yansong; Jiang, Lina; Yu, Dan; Ren, Yuanlin; Liu, Xiaohui
• Is Part Of: Polymer degradation and stability. Volume 206(2022)
• Publication Date: 2022-12
• Subjects: Polyacrylonitrile fiber -- Sodium lignosulfonate -- Copper ions -- Char-forming capability -- Cooperative effect; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2022.110176
• Languages: English
• ISSNs: 0141-3910

Abstract

Highlights: Bio-mass SLS and Cu 2+ were used for flame-retardant modification of PAN fibers. The treated PAN fibers have excellent flame-retardancy and char-forming capability. SLS and Cu 2+ are cooperative in improving the flame-retardancy of PAN fibers. The modification approach was facile and eco-friendly. Abstract: A facile and eco-friendly approach was developed to endow polyacrylonitrile fibers (PAN) with excellent flame retardancy and char-forming capability. First, aminated PAN (A-PAN) was prepared via ethylenediamine treatment. Next, sodium lignosulfonate (SLS) was adsorbed on the surface and interior of A-PAN through strong ionic bonds to obtain the SLS modified A-PAN, i.e., SLS/A-PAN. Afterwards, copper ions (Cu 2+ ) were chelated with SLS/A-PAN to construct Cu/SLS/A-PAN. The modified PAN samples were characterized by solid-state 13 C NMR, FTIR, XPS and SEM. TGA demonstrated that the preferential degradation of Cu/SLS/A-PAN was prone to forming much char residue whether in N2 or air atmosphere, which acted as an effective barrier to hinder the decomposition of PAN matrix so as to exhibit excellent flame retardancy. Additionally, the char residue of Cu/SLS/A-PAN showed numerous intumescent vesicles with continuous wavy-like char layer and its I D / I G value was 1.28, exhibiting superior degree of graphitization. Particularly, compared to the pristine sample, the peak of heat release rate of Cu/SLS/A-PAN decreased significantly. In addition, TG-IR indicated the volatile products of Cu/SLS/A-PAN were significantly reduced. SLS and Cu 2+ were cooperative in endowing Cu/SLS/A-PAN with excellent flame retardancy and superior char-forming capability. Graphical abstract: Image, graphical abstract