Swerea IVF , Box 104, Mölndal SE-431 22, Sweden.
Department of Chemistry and Chemical Engineering, Applied Surface Chemistry, Chalmers University of Technology , 412 96 Gothenburg, Sweden.
ACS Appl Mater Interfaces. 2017 Nov 8;9(44):39069-39077. doi: 10.1021/acsami.7b13466. Epub 2017 Oct 20.
The inherent flammability of cellulosic fibers limits their use in some advanced applications. This work demonstrates for the first time the production of flame-retardant macroscopic fibers from wood-derived cellulose nanofibrils (CNF) and silica nanoparticles (SNP). The fibers are made by extrusion of aqueous suspensions of anionic CNF into a coagulation bath of cationic SNP at an acidic pH. As a result, the fibers with a CNF core and a SNP thin shell are produced through interfacial complexation. Silica-modified nanocellulose fibers with a diameter of ca. 15 μm, a titer of ca. 3 dtex and a tenacity of ca. 13 cN tex are shown. The flame retardancy of the fibers is demonstrated, which is attributed to the capacity of SNP to promote char forming and heat insulation on the fiber surface.
纤维素纤维的固有可燃性限制了它们在某些先进应用中的使用。本工作首次展示了由木材衍生的纤维素纳米纤维（CNF）和硅纳米粒子（SNP）制备阻燃宏观纤维。纤维是通过将阴离子 CNF 的水悬浮液在酸性 pH 值下挤出到阳离子 SNP 的凝固浴中来制造的。结果，通过界面络合形成具有 CNF 核和 SNP 薄壳的纤维。显示出直径约为 15 μm、纤度约为 3 dtex 和强度约为 13 cN tex 的经硅烷改性的纳米纤维素纤维。纤维的阻燃性得到了证明，这归因于 SNP 在纤维表面促进炭形成和隔热的能力。
