Abstract
This paper describes the synthesis of an aromatic polyphosphonate from the reaction of phenoxy dichlorophosphate (PDCP) with 4,4′-sulphonyldiphenol (SDP) in a chlorinated hydrocarbon solvent under low temperature conditions. The glass transition temperature ( T g) and melt temperature ( T m) of PDCP/SDP polymer are 69°C and 133°C, respectively. The lower T g value of PDCP/SDP compared to that of phenyl phosphonic dichloride/SDP may be attributed to the flexible ether linkage. This polymer started to lose weight at around 300°C under air or nitrogen atmosphere. The PDCP/SDP polymer has good flame retardancy, as indicated by high limiting oxygen index of 47.0.
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