Thin film from conjugated block copolymers

Figure 2 [24,118] shows the infrared spectrum of uncured poly(VDF-co-HFP) copolymer (FKM gum), before and after a thin film of polymer is heated in air at 300 °C. Two new bands centered at 1580 and 1750 cm appeared after heating, which are assigned to the conjugated double bonds and to the - CH = CF2 end groups, respectively. Unsaturation is likely to be caused by elimination of HF from PVDF block of the FKM chain, in particular from the head-to-tail position of the structure. 

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