CHARACTERIZATION OF POLYPARAPHENYLENE SUBJECTED TO DIFFERENT HEAT TREATMENT TEMPERATURES

摘要

We investigated the structural and electronic properties of samples of polyparapheny-lene (PPP), derived from two synthesis methods (the Kovacic and Yamamoto methods). These samples have been subjected to different heat-treatment temperatures (650℃ ≤ T_(ht) ≤ 2000℃) and their properties are compared to the polymer prior to heat-treatment (T_(Ht)=0℃). The photoluminescence (PL) spectra of heat-treated PPP based on the two synthesis methods reflects the differences in electronic structure of the starting polymers. The PL emission from the heat-treated Yamamoto polymer is quenched at much lower T_(ht) than from the Kovacic material. However, Raman spectra taken of the material resulting from heat-treatment of the polymer (using both preparation methods) indicate the presence of phonon modes for PPP in samples at T_(Ht) up to 650℃.