Abstract
Abstract UV photoelectron spectra were measured for polypropylene (PP), poly(vinyl fluoride) (PVF), 1,2-polybutadiene (1,2-PBD), poly(vinyl chloride) (PVC), and poly(vinyl alcohol) (PVA). Their threshold ionization energies were found to be 8.5, 9.2, 7.5, 8.8, and 8.0 eV (1 eV≅0.1602 aJ), respectively. The evolution of their electronic structures (from those of small related molecules) were analyzed, mainly, by using the photoelectron spectra of these small compounds (including the new data of 1,2-propanediol). The data of previously measured polyethylene (PE) and polystyrene (PS) were analyzed together. With the results, the polymers were classified into three groups according to the increasing order of localization of the positive hole in the cationic state: (1) PE, PP, and PVF, (2) 1,2-PBD, PVC, and PVA, and (3) PS as a representative of aromatic-pendant polymers.
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