TY - CONF A1 - Yin, Huajie A1 - Schönhals, Andreas T1 - Glass Transition of Ultrathin Films of Homopolymers and Polymer Blend Investigated by Dielectric Relaxation and Specific Heat Spectroscopy T2 - Kolloqiumsvortrag, Helmholtz-Zentrum Geesthacht T2 - Kolloqiumsvortrag, Helmholtz-Zentrum Geesthacht CY - Geesthacht, Germany DA - 2013-06-21 PY - 2013 AN - OPUS4-28705 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Yin, Huajie A1 - Schönhals, Andreas A1 - Cangialosi, D. T1 - Glass transition and segmental dynamics of ultrathin polycarbonate and polystyrene films T2 - 7th International Discussion Meeting on Relaxations in Complex Systems T2 - 7th International Discussion Meeting on Relaxations in Complex Systems CY - Barcelona, Spain DA - 2013-07-21 PY - 2013 AN - OPUS4-28845 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Yin, Huajie A1 - Cangialosi, D. A1 - Schönhals, Andreas T1 - Glass transition and segmental dynamics in thin supported polystyrene films: The role of molecular weight and annealing JF - Thermochimica Acta N2 - Broadband dielectric spectroscopy (BDS), specific heat spectroscopy (HCS) and capacitive scanning dilatometry (CSD) are used to study the glass transition and segmental dynamics in thin supported polystyrene (PS) films. Different molecular weights (Mw = 50 kg/mol, Mw = 260 kg/mol, Mw = 1408 kg/mol) and annealing protocols are employed in the study. The segmental dynamics is independent of the film thickness for each Mw in the temperature window of the dielectric measurement. The thermal glass transition temperature, Tg, measured by CSD depends on the film thickness and shows also a dependence on Mw. These observations are explained in terms of the formation of irreversibly adsorbed layer due to chain adsorption on the Al substrates during annealing. KW - Thin polystyrene films KW - Glass transition KW - Segmental dynamics PY - 2013 DO - https://doi.org/10.1016/j.tca.2013.05.034 SN - 0040-6031 SN - 1872-762X VL - 566 SP - 186 EP - 192 PB - Elsevier CY - Amsterdam AN - OPUS4-28736 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Yin, Huajie A1 - Schönhals, Andreas T1 - Calorimetric glass transition of ultrathin poly(vinyl methyl ether) films JF - Polymer N2 - Specific heat spectroscopy in the frequency range typically from 1 Hz to 1 kHz with a sensitivity of pJ/K was employed to study the glass transition behavior of ultrathin poly(vinyl methyl ether) (PVME) films with thicknesses ranging from 218 nm down to 12 nm. The amplitude and the phase angle of the complex differential voltage as a measure of the complex heat capacity were obtained as a function of temperature at a given frequency simultaneously. Both spectra are used to determine the dynamic glass transition temperature as a function of both the frequency and the film thickness. As main result no thickness dependence of the dynamic glass transition temperature was observed down to a film thickness of 12 nm within the experimental uncertainty of ±2 K. Further the width of the glass transition is independent of the film thickness which indicates that the extent of the cooperativity is essentially smaller than 12 nm. KW - Specific heat spectroscopy KW - Dynamic glass transition KW - Poly(vinyl methyl ether) PY - 2013 DO - https://doi.org/10.1016/j.polymer.2013.02.025 SN - 0032-3861 SN - 1873-2291 VL - 54 IS - 8 SP - 2067 EP - 2070 PB - Springer CY - Berlin AN - OPUS4-28011 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Yin, Huajie A1 - Schönhals, Andreas T1 - Calorimetric Glass Transition of Ultrathin Films of Homopolymers and Their Blends T2 - DPG Frühjahrstagung T2 - DPG Frühjahrstagung CY - Regensburg, Germany DA - 2013-03-10 PY - 2013 AN - OPUS4-28762 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Yin, Huajie A1 - Schönhals, Andreas T1 - Calorimetric glass transition of ultrathin films of homopolymers and their and their blends T2 - 7th International Discussion Meeting on Relaxations in Complex Systems T2 - 7th International Discussion Meeting on Relaxations in Complex Systems CY - Barcelona, Spain DA - 2013-07-21 PY - 2013 AN - OPUS4-28844 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Mix, Renate A1 - Yin, Huajie A1 - Friedrich, Jörg Florian ED - Gutowski, W. ED - Dodiuk, H. T1 - Aerosol-based DBD - A simple way to provide polymers with functional groups for adhesion promotion T2 - Recent advances in adhesion science and technology in honor of Dr. Kash Mittal N2 - Polypropylene (PP) foils were exposed to the plasma of an atmospheric dielectric barrier discharge (DBD) in presence of different aerosols. Pure liquids such as water, ethanol, and 1/1 mixtures ethanol/water (v/v) or aqueous Solutions of acetic acid, poly(acrylic acid), poly(vinyl alcohol), and ethylene glycolpoly(vinyl alcohol) copolymer were introduced into the DBD. Surface composition, the number of functional groups per 100 C atoms, and water contact angles were correlated with the energy density of DBD plasma exposure. The wettability of the treated surfaces was investigated for different storage times. Peel strength of the thermally deposited aluminum layer to modified polymer surfaces revealed that the aerosol introduction strongly improves the adhesion between aluminum and polypropylene. KW - Aerosol-assisted DBD KW - Functional groups KW - Surface modification PY - 2013 SN - 978-90-04-20173-6 SN - 978-90-04-20174-3 SP - Chapter 8, 155 EP - 170 PB - CRC Press AN - OPUS4-30035 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -