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首页> 外文期刊>Journal of Applied Polymer Science >Thermal properties of Bombyx mori silk fibers
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Thermal properties of Bombyx mori silk fibers

机译：家蚕丝纤维的热性能

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The thermal properties of Bombyx mori silk fibers subjected to heat treatment were examined by thermogravimetry, differential thermal analysis, Fourier transform infrared absorption spectrometry (TG-DTA-FTIR) and scanning electron microscopy (SEM). The color, size, and shape of B. mori cocoon shells were observed as they were heated from 25 to 550degreesC. Only 1% of the original cocoon shell weight remains as cocoon ash after treatment at 550degreesC. Inorganic components, such as calcium, potassium, sulfur, magnesium, etc., were detected in the cocoon ash by energy dispersion fluorescent X-ray spectrometry. A sharp decrease in was observed in the TG data beginning around 280degreesC, and in endothermic peak appeared at 308degreesC, as evidenced by the DTA curves. The IR bands observed at 2380 cm(-1) (-OH stretching), 1760 cm(-1) (C=O stretching), 1503 (N-H stretching), 1085 cm(-1) (C-N stretching) and 965 cm(-1) (-NH2 stretching) become stronger as an exothermic reaction beginning at 280degreesC takes place. This is probable due to cleavage of the main chain and the accompanying decomposition of the silk fibers. Similarly, a SEM micrograph of silk fibers treated at 300degreesC shows a microtubule in the middle of the silk fibers of about 25-mum diameter. This suggests that the thermal reactions starts in the middle of the silk fiber and forms a microtubule. (C) 2002 Wiley Periodicals, Inc. [References: 5]
机译：通过热重分析，差热分析，傅立叶变换红外吸收光谱法（TG-DTA-FTIR）和扫描电子显微镜（SEM）检验了热处理过的蚕蚕丝纤维的热性能。从25℃加热到550℃，观察到了桑蚕茧壳的颜色，大小和形状。在550°C处理后，仅保留原始茧壳重量的1％作为茧灰。通过能量色散荧光X射线光谱法检测了茧灰中的无机成分，例如钙，钾，硫，镁等。 DTA曲线证明，TG数据从280摄氏度开始急剧下降，吸热峰出现在308摄氏度。在2380 cm（-1）（-OH拉伸），1760 cm（-1）（C = O拉伸），1503（NH拉伸），1085 cm（-1）（CN拉伸）和965 cm（ -1）（-NH2拉伸）随着从280摄氏度开始的放热反应而变强。这可能是由于主链的断裂以及随之而来的丝纤维的分解。类似地，在300℃下处理的丝纤维的SEM显微照片显示，在直径约25μm的丝纤维中间有微管。这表明热反应开始于丝纤维的中间并形成微管。 （C）2002 Wiley Periodicals，Inc. [参考：5]

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