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Synthesis and Biological Activity of Polyketone Resins-IV. Systems Based on m-Xylene with Nitrobenzene as Solvent

Seven chlorine-terminated polyketones of low molecular weight were prepared from m-xylene, chloroacetyl chloride and ao-dichloroalkanes, i.e. dichloro-methane and 1,2-dichloroethane, by the Friedel-Crafts reaction using nitrobenzene as solvent. The polyketones were characterized by [R spectra and vapour pressure osmome-t'y. The thermal properties were studied by thermogravimetry and differential scanning calorimetry. The kinetic parameters for the decomposition reactions were evaluated by the Broido and Doyle methods. The polyketones were found to be thermally sable up to 220°C but decompose beyond this temperature. All the resins were screened for their biological activity against plant pathogens (Pseudomonas fluorescens, Bacillus subtilis, Aspergillus niger and Trichoderma viride). The biological screening against bacteria has indicated that these polyketones have biocidal properties.