Preparation and Purification of a Flame-Retardant Polyphenylphosphonate Containing 4,4'-Dihydroxybenzophenone

Graziele Vefago Boaventura Possenti1, Aline Vieira de Souza2, Rodrigo Battisti1, Juliani Conti Martins Dominguini2, Lucas Dominguini1, Cintia Soares2, Humberto Gracher Riella2
1 Federal Institute of Education, Science and Technology of Santa Catarina (IFSC), campus Criciúma, Rodovia SC 443 km1, nº 845, Vila Rica, Criciúma, Santa Catarina, Brazil, 88813-600 2 Chemical Engineering Department, Federal University of Santa Catarina (UFSC), campus Trindade, Florianópolis, Santa Catarina, Brazil, 88040-900
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A polyphenylphosphonate containing 4,4'-dihydroxybenzophenone was synthesized as a flame retardant. However, impurities were detected and may compromise its properties and thermal stability. Thus, a purification route based on water and hexane extraction with reflux was proposed. Results showed success in removing impurities, especially P–Cl groups, without damaging the polymer.

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