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• W2011018105 startingPage "2217" @default.
• W2011018105 abstract "The frictional properties of spun-cast films of polystyrene and poly(methyl methacrylate) (PMMA) have been characterized using friction force microscopy (FFM). In air, the friction−load relationship was found to obey Johnson−Kendall−Roberts mechanics, but under ethanol, it was found to fit Amontons’ Law. The coefficient of friction measured under ethanol was found to increase with increasing molecular weight, up to a molecular weight close to the bulk critical molecular weight for entanglement. At greater values than this, the coefficient of friction changed comparatively little with molecular weight. It is suggested that at molecular weights below Mc, the frictional interaction is dominated by plowing of the tip between polymer molecules; as molecular weight increases, so the viscosity of the film increases and the coefficient of friction increases. After the onset of entanglement, the mechanism of energy dissipation changes to one in which the tip sticks in loops of polymer between entanglements, extending the chains until at a critical stress, the contact is broken. The frictional interaction is thus comparatively invariant with molecular weight. FFM was also used to investigate the kinetics of the UV-induced modification of PMMA. A progressive decrease in the coefficient of friction was observed as a function of the time that the film was exposed to UV light, a result which was correlated to a gradual reduction in the molecular weight of the polymer and, hence, the entanglement density of the system." @default.
• W2011018105 created "2016-06-24" @default.
• W2011018105 creator A5024073033 @default.
• W2011018105 creator A5031297560 @default.
• W2011018105 date "2009-01-15" @default.
• W2011018105 modified "2023-10-17" @default.
• W2011018105 title "Influence of Molecular Weight on Friction Force Microscopy of Polystyrene and Poly(methyl methacrylate) Films: Correlation Between Coefficient of Friction and Chain Entanglement" @default.
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• W2011018105 doi "https://doi.org/10.1021/la803407e" @default.
• W2011018105 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19146421" @default.
• W2011018105 hasPublicationYear "2009" @default.
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