Infrared laser ablation of poly(vinylidene fluoride): The Loss of HF

• PVDF laser ablation mass loss increases linearly with time after induction period. HF and polymer backbone destruction occur. Double bonds, cumulated double triple bonds form in the backbone. Fine ∼100 nm powder dendritic structures on ablation. G3MP2 calculations support mechanism of followed by cleavage. The kinetics infrared poly(vinylidene fluoride) (PVDF) vacuum have been investigated to understand how this can be used as a processing technology. heats surface initiates decomposition macromolecules molten layer which rapidly leads production an ablative flow products. There is only short period up 2 s before begins. After initial period, rate exposure. Spherical particles average diameter about 100 are formed coating obtained particle distribution ranges from 50 300 nm. main gaseous product dehydrofluorination. A seccond important process formation carbenes generated during secondary reactions. Proposed reactions due laser-induced thermal dehydrofluorination occur two stages. In first stage, bond appears direct HF. Subsequent detachment appearance both cumulene bonds. .