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In a capacitively coupled discharge with external electrodes, He, H_2, N_2 or Ar were used as plasmagas, polymerization of octafluorocyclobutane was carried out under different conditions by varyingdischarge power, pressure, plasma gas and plasma-gas/monomer ratio. Structure of polymerizedproducts was characterized by IR spectroscopy and ESCA measurement. It was found that therewere six elements in the products, i.e. C, F, Si, O, N and H. The probably existed groups in poly-mers wer investigated. By analyzing the resolved peaks of C_(1S) region in ESCA spectra, effect of thereaction conditions on degree of branching of the polymerized products and the relationship of thepolymer structure wth the mechanism of the competitive ablation and polymerization process werestudied. In addition, polymer deposition process occurring in glow discharge was discussed. 相似文献
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用X射线光电子能谱(XPS)测定了五种铬化合物、六种磷化合物的2p光电子结合能值,记录了制备条件相同但焙烧温度不同的一系列P-SiO_2,Cr-SiO_2,Cr-P-SiO_2催化剂样品的XPS谱图。由这些谱图可以看出催化剂的Cr_(2p),P_(2p),O_(1s),Si_(2p)光电子峰结合能的变化和谱峰强度的变化与焙烧温度有关;在焙烧过程中,催化剂的活性组分铬由Cr(Ⅵ)变为Cr(Ⅲ),P_(2p),0_(1s),Si(2p)光电子峰的强度也发生变化。我们还观察到在X射线辐照下或Ar~+离子刻蚀下的催化剂中活性组分铬的还原现象。 相似文献
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本文研究了用X-光电子能谱(XPS)求F-46(四氟乙烯—六氟丙烯共聚物),含氟聚酰亚胺和聚偏氟乙烯的凝胶化剂量(Rg),并表征其交联度。目前交联的含氟聚合物的XPS研究,特别是用它表征交联度还未见文献报告。实验结果表明这些含氟聚合物的辐射交联是通过脱氟原子进行的,其F/C(氟原子与碳原子比)必然随交联度的增加而下降,从而与其交联度相关。以交联样品的logF/C对logR(辐照剂量)做图,或以logⅠ(含氟原子碳基团的Cls峰的相对强度)对logR做图,可以求得Rg值。用XPS方法和凝胶含量方法求得的Rg值较一致。 相似文献
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本文用X-射线光电子能谱(XPS)研究了聚丙烯膜表层的光氧化产物,得出几种主要氧化产物的相对含量随氧化时间变化的规律并将其与缸外光谱所测结果及文献报道的相比较,证明膜表层光氧化和膜整体光氧化规律有所不同。根据实验结果提出了反应机理。 相似文献