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Polymers with pendent functional groups. V. Thermooxidative and thermal behavior of chloromethylated polysulfones

2000; Elsevier BV; Volume: 69; Issue: 2 Linguagem: Inglês

10.1016/s0141-3910(00)00057-4

1873-2321

Ecaterina Avram, Mihai Brebu, Abraham Warshawsky, Cornelia Vasile,

Polymer Science and PVC

The first step of the thermooxidative and thermal decomposition of some chloromethylated polysulfones (CMPSF) with various degrees of substitution has been studied by thermogravimetry (TG) and thermal volatilization analysis (TVA). A step occurring at lower temperatures 260–370°C is particular for halomethylated polysulfones because the polysulfone (PSF) is thermally stable in this temperature range (its first decomposition step occurs from 400 to 550°C). The higher the degree of substitution, the lower the degradation temperature and a better separation of the processes was found. The thermal decomposition products collected were analyzed by IR spectroscopy and elemental analysis. According to our TG and TVA results and literature data , it can be proposed that –CH2Cl groups react at low temperatures giving cross-linked polymer and gas or liquid products. The thermal characteristics of this process depend on the chlorine content of the sample and explain undesirable cross-linking that could take place during the synthesis of the chloromethylated polysulfones.