Resonantly enhanced off-specular X-ray scattering from polymer/polymer interfaces⋆
Abstract.We have used measurements of the absolute intensity of diffuse X-ray scattering to extract the interfacial tension of a buried polymer/polymer interface. Diffuse scattering was excited by an X-ray standing wave whose phase was adjusted to have a high intensity at the polymer/polymer interface and simultaneously a node at the polymer/air interface. This method permits the capillary-wave-induced roughness of the interface, and hence the interfacial tension, to be measured independently of the polymer/polymer interdiffusion.
Structure and dynamics of thin polymer films using synchrotron X-ray scattering
Recent measurements of the scattering function and of the dynamics of surface and interfacial fluctuations in thin supported molten films and bilayers using synchrotron X-ray diffuse scattering and photon correlation spectroscopy in reflection geometry are reported. The results for monolayer films thicker than four times of the radius of gyration of polystyrene show behavior of normal over-damped capillary waves expected for the surface fluctuations of a viscous liquid. However, thinner films show deviations indicating the need to account for viscoelasticity. The theory has been extended to the surface and interfacial modes in a bilayer film system. The results are discussed in terms of surface tension, viscosity and shear modulus. Also recent experiments to measure the isothermal compressibility of supported polystyrene films by studying `bulk' scattering from the interior of the films is discussed.
"The Plain Round Tale of Faithful Thady": Castle Rackrent as Slave Narrative
Critics of Maria Edgeworth’s Castle Rackrent tend to focus on textual elements—gender issues, the symbolism of the Big House, colonial hegemony— or contextual readings by placing Edgeworth in the Anglo-Irish history and tradition. While such criticism usually in some way examines the main theme of the text, the appropriation of power and authority, little of it accomplishes both the textual and contextual analysis that Castle Rackrent deserves. Exploring Thady’s “plain round tale” as a slave narrative in content and form sheds new light on the work both textually and contextually; in Thady Quirk, Edgeworth has created a typical slave narrator who recounts a history of oppression which is ultimately mediated by an outside editor. As John Cronin writes of Castle Rackrent, “What Maria Edgeworth has given us . . . is a magnificently realised slave, a terrifying vision of the results of colonial misrule. There must have been a moment of clearly deliberate artistic decision in which she realised that what needed to be said must be said through one of the submerged people.”1 The three main textual elements of the narrative indicate its likeness to typical slave narratives: its presentation of a conflicted slave narrator, its use of the framing device of the outside editor, and its narrative structure of episodic anecdotes that utilizes memory, description, and didacticism.