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Partly deuterated hydroxy-terminated poly(styrene d8-r-methyl methacrylate) statistical copolymers with different molecular weights were grafted to a silicon substrate. Then, fully hydrogenated hydroxy-terminated poly(styrene-r-methyl methacrylate) statistical copolymers were spun over the pregrafted substrate and let to react at 250 °C following the time evolution of the brush thickness and composition. Over time, the grafting density of the deuterated polymers decreases, whereas the grafting density of the hydrogenated polymers increases thus indicating the simultaneous occurrence of grafting and degrafting reactions. Moreover, keeping constant the grafting time, the total grafting density decreases as the molecular weight of the hydrogenated polymers increases, until a limiting value is reached when the molecular weight of the incoming polymer is equal to the one of the preformed brush. The overall picture of the …
American Chemical Society
Publication date: 
14 Dec 2020

Michele Laus, Riccardo Chiarcos, Valentina Gianotti, Diego Antonioli, Katia Sparnacci, Gianmarco Munaò, Giuseppe Milano, Antonio De Nicola, Michele Perego

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