Chemical modification of poly(N-vinylcarbazole)

✍ Scribed by J. Pielichowski; E. Morawiec

• Publisher: John Wiley and Sons
• Year: 1976
• Tongue: English
• Weight: 466 KB
• Volume: 20
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1976.070200710

✦ Synopsis

Investigation of the phosphorylation reaction of poly(vinylcarbazo1e) was carried out using different phosphorylating reagents and in the presence of various catalysts. Pc13, PBr3, P2S5, and H3P04 + P205 were examined, and it was noticed that PC13 and PBr3 were the most effective phosphorylating reagents. The best results for the phosphorylation process of poly(viny1carbazole) were obtained a t 76OC when PC13 was used and at 14OOC when PBr3 was used. It was confirmed that the percentage of phosphorus which was introduced into the polymer can be expressed by the following formula:

The optimal value of the reaction time for both these phosphorylating reagents PCg and PBr3 amounts to 6 hr. The phosphorylated poly(vinylcarbazo1e) obtained under these conditions shows ion exchange behavior-the value of ion-exchange capacity amounts 3.2 mval/g. The pH-metric titration curve indicates two stages of dissociation. The DTA curve shows that there is no decomposition of the phosphorylated poly(vinylcarbazo1e) up to a temperature of 300OC; at 55OoC, there is 37.5% loss of weight. Spectrophotometric IR studies of phosphorylated poly-(vinylcarbazole) indicate that the maximal quantity of phosphorus in the polymer is 11.3% P, that means one phosphone group in each monomer unit.

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