Confinement Effects on Chain Entanglement in Free-Standing Polystyrene Ultrathin Films
نویسندگان
چکیده
Confinement Effects on Chain Entanglement in Free-Standing Polystyrene Ultrathin Films Jeremy M. Rathfon, Robert W. Cohn, Alfred J. Crosby, Jonathan P. Rothstein, and Gregory N. Tew* Department of Polymer Science and Engineering, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003, United States ElectroOptics Research Institute and Nanotechnology Center, University of Louisville, Louisville, Kentucky 40292, United States
منابع مشابه
Hole Nucleation and Growth in Free-Standing Polystyrene Ultrathin Films
Nucleation and growth of holes in free-standing ultrathin (<100 nm) polymer films are examined via opticalmicroscopy in order to gain a better understanding of these phenomena.Hole nucleation is quantified with a free energy barrier based on a simple capillary model. Additionally, holes are found to grow exponentially in accordance with previous studies in the literature. Ultrathin films of pol...
متن کاملEffect of nanoscale confinement on glass transition of polystyrene domains from self-assembly of block copolymers.
The understanding of size-dependent properties is key to the implementation of nanotechnology. One controversial and unresolved topic is the influence of characteristic size on the glass transition temperature (T(g)) for ultrathin films and other nanoscale geometries. We show that T(g) does depend on size for polystyrene spherical domains with diameters from 20 to 70 nm which are formed from ph...
متن کاملSegmental relaxation behavior of polystyrene chains in the cores of collapsed dry micelles tethered on the micelle film surface by a poly(acrylic acid) corona.
We present an experimental investigation of the segmental relaxation behavior of polystyrene (PS) chains that are confined in a micellar core tethered by a poly(acrylic acid) (PAA) block corona on the dry film surface, along with various core density and molecular weight of PS block from below to well above the entanglement molecular weight. The results show that the onset temperature of PS cha...
متن کاملFiber Formation from the Melting of Free-standing Polystyrene, Ultra-thin Films: A Technique for the Investication of Thin Film Dynamics, Confinement Effects and Fiber-based Sensing
...................................................................................................................... vi LIST OF TABLES ............................................................................................................ xii LIST OF FIGURES ......................................................................................................... xiii
متن کاملConfinement effects on glass transition temperature, transition breadth, and linear expansivity: an ultraslow X-ray reflectivity study on supported ultrathin polystyrene films.
X-ray reflectivity measurements of the glass transition in thin polystyrene films supported on Si substrates were performed at slow cooling rates ranging from 0.62 to 0.01 (°)C/min. At a cooling rate of 0.14 (°)C/min, a depression in the glass transition temperature Tg was clearly observed with decreasing thickness. However, at a cooling rate of 0.62 (°)C/min, only a slight decrease in Tg for a...
متن کامل