Abstract
AbstractThe effect of blood serum in vitro during 16 month at 40°C on the properties of poly‐bis‐(trifluoroethoxy)phosphazene films containing 0.16 mole‐% anomalous units of unsubstituted P—Cl‐groups in the chain and being characterized by [η] = 4.00 dl/g in acetone has been investigated. Under these conditions the polymer shows biological resistance. The decrease in [η] to 75% of the original value during the first three months exerts actually no effect on the strength of the films and can be explained by hydrolytic degradation of the anomalous units of the chain. The crystallization of the polymer during medical‐biological tests affects the mechanical properties of the films.
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