聚苯硫醚纤维的定性鉴别

Qualitative Identification of Polyphenylene Sulfide Fiber

采取燃烧法、显微镜法、化学溶解法、熔点法和红外吸收光谱法对聚苯硫醚纤维进行定性鉴别。试验表明聚苯硫醚纤维的燃烧特征为在接近火焰时收缩,在火焰中熔融燃烧,冒些许黑烟,离开火焰不延燃,有臭味,残渣为黑褐色硬块;该纤维的横截面形态为圆形或近似圆形,其纵向形态为表面平滑;纤维溶解于沸腾的硫酸(95%~98%)和硝酸(65%),溶液颜色分别呈现黑色和黄色;纤维的熔点为284℃;观察1 090.69cm-1特征峰是判断聚苯硫醚结晶度的一种方法,通过红外谱图和谱带的分布可以有效鉴别聚苯硫醚纤维。

Polyphenylene sulfide fiber was identified by burning, microscope, dissolution, melting point and infrared absorption spectrum method. The results showed that polyphenylene sulfide fibers shrinked when they were close to the flame, melted and burn- ed in the flame and had some black smoke, self-extinguished after leaving the flame, had frowziness, residue was dark brown lumps; Cross section shape of the fiber was round or approximate round, surface of the fiber was smooth. The fiber dissolved in boiling sulfu- ric acid（95%-98%） and nitric acid（65M）, the color of solution was black and yellow, respectively. The melting point of the fiber was 284 ℃. It was a kind of method to judge the crystallinity of polyphenylene sulfide by observing the characteristic peak of I 090. 69 cm-1. The polyphenylene sulfide fiber could be effectively identified by the infrared spectrum and the distribution of the band.