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- W2040889785 abstract "The expansion and contraction behavior of a neat poly(methyl methacrylate) film is induced by 248 nm excimer laser exitation and directly measured by nanosecond interferometry. Above the ablation threshold (1400 mJ/cm2), the film expands during the excitation laser pulse, and after 25% expansion of the thickness, it undergoes fragmentation. Below the threshold, the expansion rate is still high (a few nm/ns), and permanent swelling is observed after transient expansion and succeeding contraction. By decreasing the laser fluence below 800 mJ/cm2, permanent swelling was not observed, and at a few tens of mJ/cm2, novel oscillatory expansion and contraction behavior was successfully detected. The expansion amplitude as a function of laser fluence indicates that the polymer film undergoes phase transition from glass to rubber upon excitation with a fluence higher than 450 mJ/cm2. In the glass state, the interpenetrating structure of the polymer film and associated free volume distribution may be changed upon irradiation, and photochemical degradation should be involved. A dynamic view of these polymer properties explains well the unique expansion and contraction behavior. Furthermore, these laser-induced morphological changes are compared with those of polymer films doped with aromatic molecules and considered in general." @default.
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- W2040889785 date "2001-03-10" @default.
- W2040889785 modified "2023-10-16" @default.
- W2040889785 title "Laser-Induced Nanometer−Nanosecond Expansion and Contraction Dynamics of Poly(methyl methacrylate) Film Studied by Time-Resolved Interferometry" @default.
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- W2040889785 doi "https://doi.org/10.1021/jp0025328" @default.
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