INFLUENCE OF ANNEALING TREATMENT ON IODINE-DOPED POLY(N-VINYLCARBAZOLE) POWDERS

After room temperature doping of poly(N-vinylcarbazole) by iodine, the powders were annealed at different temperatures (370, 400, 470 and 57 0 K) for 24 h under vacuum or under iodine pressure. The powders obtai ned were studied by differential thermal analysis (DTA), gravimetric t hermal analysis (GTA), infrared absorption (IR) and X-ray photoelectro n spectroscopy (XPS). It is shown that in each powder there is only 3 at.% of iodine. The results have also shown that at low annealing temp erature, the glass transition temperature decreases while the weight l oss increases, which can be attributed to short chain length. After an nealing at 570 K the weight loss decreases but the IR spectrum is stro ngly affected. This change is attributed to polymer degradation during annealing under iodine pressure.