Dry Spinning of Polysilazane and Ultraviolet Irradiation Cross-Linking of Fibers

Abstract

Abstract: The precursors of polysilazane (PSZ) with different weights were dissolved in xylene to obtain the spinning solution with different concentration. PSZ spinning solution was converted to SiCN(O) fibers by dry spinning, ultraviolet (UV) irradiation cross-linking, and pyrolysis at 1 100 ℃. The rheological property of PSZ spinning solution and the UV irradiation cross-linking process of PSZ fibers were investigated by rotational rheometer, FTIR, XPS, SEM and TG. The composition, structure and properties of PSZ fibers and SiCN(O) fibers before and after irradiation were also characterized. The results show that the PSZ spinning solution with the mass fraction of 87% has shear thinning behavior at room temperature, which belongs to the pseudoplastic fluid and has excellent dry spinning performance. The ceramic yield of PSZ fibers increases by 30.8% compared with the green fibers after 7 h cross-linking under UV irradiation with wavelength of 185 nm. This research has certain exploration significance for the new spinning process of PSZ and the curing treatment of PSZ fibers.

Key words: polysilazane, SiCN(O) fiber, rheology, dry spinning, UV irradiation, ceramic yield

CLC Number:

TQ343

LUO Xiaoyu, LI Xiaohong, ZHANG Mengna, CHEN Hao, BAO Zhihao, CHEN Jianjun. Dry Spinning of Polysilazane and Ultraviolet Irradiation Cross-Linking of Fibers[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 2197-2205.

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