PBS纤维制备过程中白粉的成因分析

s a fully biodegradable fiber, PBS fiber will produce more white powder in the process of drawing or texturing, which will affect the mechanical properties, processing properties and appearance of the fiber. Therefore, the structure of the white powder was characterized by nuclear magnetic hydrogen spectroscopy (1HNMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), thermogravimetric analysis (TG), and X-ray diffraction analysis (XRD) and other test methods, also to analyze the reason of producing the white powder. The results showed that the chemical structure of white powder was the same as that of PBS slice; the melting point of white powder is about 5℃ higher than that of PBS slice (115℃), and its melting enthalpy (126.04J/g) is higher than that of fully crystallized PBS (110.3J/g); the thermal stability of white powder is poor, and there are three steps in TG curves; according to the results of GPC and XRD, it can be further judged that white powder is composed of oligomers with different degree of polymerization. In the process of storage and processing, oligomers migrate from the inside to the surface of the fiber, peel off and separate out due to the effect of friction, resulting in white powder.