【摘要】 PPS结构单元（C₆H₄S）中含重原子硫。它的实验电子密度减约径向分布函数P（r）,在4～7 范围内出现明显的指纹峰。根据PPS的晶体结构模型,建立了理论上近似的P（r）曲线,与实验结果比较,发现第五、六、七峰随结晶度下降而降低,是和结晶结构中分子链间的三个S～S间距（5.16 、5.61 、6.76 ）遭到破坏相一致。S～C间距数与非晶态样品中第四、七峰的增高相一致。这个现象估计是分子链沿纤维轴方向发生位移引起的。更多还原

【Abstract】 Owing to the existance of sulfur, a heavy atom in the structure unite of PPS （C₆H₄S）, the experimental reduced radial distribution function of its electron density, P（r）, show a group finger print peaks in the range of 4-7（?） distinctly. According to the crystal structure model of PPS, a theoretical approximated P（r） curve is set up. Comparing with the experimental results, we have discovered the height of 5th, 6th, and 7th peak, which decreases with the decreasing of sample crystallinity, is consistent with the damage of three interchain s-s distances（5.16（?）, 5.61（?）, 6.76（?）） in the crystal structure. And, correspondingly, the number of s-c distance increased in consistent with the increasing fo 4th and 7th peak height in the sample of noncrystalline state. This phenomenon may be estimated that it is caused by the molecular chain displacement occuring along the direction of fibrous axis. The peak position of 6th moved from 5.7（?） to 6.0（?） is reffered to the lateral expansion between the molecular chains obviously. In addition, the broad peak is also analyzed, such as peak position, tendency of height changing, and limitation of existing range. We conclnde that in a near range, smaller than 20-30（?）, noncrystalline PPS still exists in elatral ordered structure. And packing of molecular chain is estimated somewhat like the lingand state of crystelline PPS periodicity of intermolecular ordering is～5.2（?）.更多还原