info:eu-repo/semantics/article
Polymer blend latex films: Miscibility and polymer diffusion studied by energy transfer
Fecha
2008-04Registro en:
Tomba, Juan Pablo; Ye, Xiaodong; Li, Fugang; Winnik, Mitchell A.; Lau, Willie; Polymer blend latex films: Miscibility and polymer diffusion studied by energy transfer; Elsevier; Polymer; 49; 8; 4-2008; 2055-2064
0032-3861
CONICET Digital
CONICET
Autor
Tomba, Juan Pablo
Ye, Xiaodong
Li, Fugang
Winnik, Mitchell A.
Lau, Willie
Resumen
Fluorescence non-radiative energy transfer experiments were used to study latex blend films composed of high molar mass poly(butyl acrylate-co-methyl methacrylate) (PBA-co-MMA) and much lower molar mass PBA-co-MMA latex of the same chemical composition (50:50 BA:MMA by weight). These blends take advantage of the strong chain length dependence of Tg so that the particles consisting of oligomeric polymer ("low-M") have a much lower Tg than the corresponding high-M latex. This type of blend represents a useful strategy for obtaining latex coatings with a reduced VOC content. Here we report on experiments which follow the rate at which the low-M polymer mixes via diffusion with the high-M polymer in the latex films. The high-M latex are doubly labeled, containing both donor and acceptor dyes covalently bound to the PBA-co-MMA backbone. Diffusion of the unlabeled low-M polymer into this phase dilutes the dyes, increasing their separation and lowering the quantum efficiency for energy transfer.